As things get QUIETER --things get LOUDER!

Posted by: Geoff P on 18 April 2004

Well I need to qualify that slightly.
By "quieter" I mean increases in clarity and reduction in noise floor together witha cleaner more separated delivery of the music.
By "louder" I mean the temptation to increase the volume because it all sounds so good and in fact the way this happens on an involuntary basis as an end result of things getting "quieter"
Do you get what I'm driving at here.

Let me link it to my own system over time.
1- In came a CDX2, the signal got much more detailed with a darker background -Result: My 112/HC/150 started being played a little louder
2- Out went the 112 in came a 282 on the HC -Result: Ah now I can hear what is "really" coming from the CDX2. Deeper detail and more "quietness". Involuntary raising of the volume again. Now the 150 is "cooking"
3)- I need more "omph" out with the 150, in with the 250mkii- Result: Wow, where did all this controlled bass come from, must be more in the CDX2 w a 282 than I thought, reach for the volume control again
4)- Bye,bye HiCap in with the supercap and put it all on Fraim- Result: Everything tightened up, no flabbiness, it's all got, deeper more detailed and at the same time there is a sense of relaxed power delivering whatever is thrown at it. Definitely this can be listenned to louder.
5)- The final addition (maybe I should say "addiction"), had to be done, just arrived an XPS2- Result: Even after just 2 day, separation of all the threads in the music, little musical details coming out of the shadows, much greater clarity in the bass so you can hear the individual notes you did'nt know you were missing before. Velvet black background, more air and dynamics, gimmee the remote this needs more volume.

So this source first stuff has it merits BUT make sure you add some oomph in the power amp department and make friends with the neighbours because the volume just has to rise as the dynamics and cleaness of delivery improves.

regards
GEOFF
Posted on: 18 April 2004 by o.j.
I second that!If a system sounds ok you can go
louder and because of there is nothing wrong
ther will be no faults magnified by the level.
Only the poweramp can come to its limit.(and neither krell nor levison does Wink)
Vice versa:A sytem that sounds unbearable
played loud is not O.K.
this is (or should be) one of the most important benchmarks for
music reproduction. (and the reason why artificial round earth
sound is definitly wrong,and not a matter of taste.)What people mean often while saying:it cant rock.
O.J.
Posted on: 18 April 2004 by Mike Hanson
This is typical. I think it's because we're used to pushing our systems to the limit, so our ears expect a certain level of distortion to indicate that it's "loud, therefore fun". When the system is cleaner, we have to push it that much harder to get that subliminal "fun edginess".

Perhaps we even need it to seem almost out of control, for it to be most enjoyable. It's like driving a car for excitement: if the car always seems completely in control and within safety limits, it's not very thrilling. However, if you get achieve that perception of "TOO FAST! TOO FAST!" then the fun becomes palpable. Of course, this is just a little theory I have. Wink

There's a related aspect for me, and that's the sense of "scale". Some might interpret this as "how big does it sound". Some speakers are not designed to sound big until they hit higher volumes. You need an amp that can push them to this level, and until you get it, you'll always be driving your system on the edge.

However, if you have a speaker that does scale at a lower volume, then I find that you're not as compelled to turn up the wick. My recent speaker change is a good example of this. My former Royd Albions sounded great, but like most speakers, they needed to be turned up to create that desirable sensation of "scale". However, the new Royd RR3s create that effect at a much lower volume, so I'm not forced to drive them as hard to get the same sense of palpable excitement.

-=> Mike Hanson <=-
Posted on: 18 April 2004 by ben r
Geoff glad to see you got the xps2, be real interested in your comments when you take it off,have you tried that yet? Ben r
Posted on: 18 April 2004 by o.j.
Hy Mike!Think the car is not a good compare.
Every music has its given level.Voices,drums,Trumpets.The goal is not to
ad distortion in the reproduction.
A hard driven car means :as fast as you can.
An enjoying music reproduction means (close
to original levelwise and not adding distortion.
A perfect speaker /amp match means to me the
similar effect to a perfect match motor/gearbox.(The feeling loudspeaker follows amp at all levels perfect controlled)

Intresting the speakerthing:Our amps have no loudness.So it is logical to me that bass/treble linearity of them is not the same
as that of our ears and brains.
For me it is therefore logical that a system
that sounds "full" at low levels will sound
bass overblown the nearer you come to realistic
levels.Vice versa it is right that a system has to sound thin at low levels. And try to play a realy good system at very low levels and you will notice that differences to an smaller one (concerning the
amp)is lot less than at high levels.
Posted on: 18 April 2004 by Geoff P
Mike
I agree with the speaker comment, but even if you have speakers that portray the dynamics at relatively low volume there is just nothing like getting them "up to speed" in the motoring analogy.
However I don't feel the need to "take the corners on two wheels", (help this car thing is getting to me).
Actually I love the feeling that there is more headroom and if I really wanted to I could crank it up even more.

O.J.
I agree things can get overblown in the bass if you do not have the right combination and we all have our crosses to bear in that direction, especially with room interactions etc. Howvever if there is one thing the addition of the XPS2 has already shown me it is that batter bass control and purer rendition of the low frequencies can help an awfull lot to cancel some of the worst room effects.

ben r
quote:
Geoff glad to see you got the xps2, be real interested in your comments when you take it off,have you tried that yet? Ben r


Thanks. The way things sound right now I won't be reporting that effect. The XPS2 ain't never coming off!
Seriously I am now into day 3 and see what all the fuss is about.

regards
GEOFF
Posted on: 19 April 2004 by Mike Hanson
It all depends on how you listen/drive. If you're satisfied by "correct" performance within your normal range of usage (as am I), then there's no need for pushing it to the edge. Merely knowing that the system/vehicle is as good as it needs to be is sufficient.

However, I find that many are compelled to drive their systems/cars to the limit. It's almost always on the edge. For example, how often have you heard the Mana brigade exclaim that they could turn up their systems louder, with the addition of a few more Sound Stages? Maximum volume is a measure of performance, and most guys tend to be fixated on making those performance-based determinations on a constant basis.

-=> Mike Hanson <=-
Posted on: 19 April 2004 by o.j.
quote:
Originally posted by Mike Hanson:
It all depends on how you listen/drive. If you're satisfied by "correct" performance within your normal range of usage (as am I), then there's no need for pushing it to the edge. Merely knowing that the system/vehicle is as good as it needs to be is sufficient.

However, I find that many are compelled to drive their systems/cars to the limit. It's almost always on the edge. For example, how often have you heard the Mana brigade exclaim that they could turn up their systems louder, with the addition of a few more Sound Stages? Maximum volume is a measure of performance, and most guys tend to be fixated on making those performance-based determinations on a constant basis.

-=> Mike Hanson <=-
Hy MIke!cars are limited by physical facts like gravitation.
Even formular 1 cars.But these come nearer to the theoretical limits. the reson why they are (a little bit
faster )around slow corners.Not talking about their
Motors or aerodinamics on high speed corners or
straight roads.

Maybe the mana stuff is damping or bringing away material resonances of your hifisystem itself.
(moving tonarms,disc transports or,humming trafos)not sure but i think mana concept means
bring away resonances fast,and not to damp it.
There is also the possibility that mana helps
against resonances in the air transmitted by
playing loud.
Intention of mana or other rack concepts can only be to keep sound clean (as it should be theoretical)and not to bring it to an higher quality level than it was before resonances.
And be sure the electrical missatch or bettersaid "non quality"inside an amp circuit,The reason for distortion of
an amp can not be damped or brought away by any
rack outside its housing.
O.J.
Posted on: 19 April 2004 by o.j.
And neither measures maximum speed of a car
its performance(except a dragster),nor maximum volume level performance of an amp.(except PA systems where
sheer level is (sometimes) one of the most important facts,infront of sound and other qualities of the system.)
O.J.
Posted on: 19 April 2004 by Geoff P
quote:
However, I find that many are compelled to drive their systems/cars to the limit. It's almost always on the edge. For example, how often have you heard the Mana brigade exclaim that they could turn up their systems louder, with the addition of a few more Sound Stages? Maximum volume is a measure of performance, and most guys tend to be fixated on making those performance-based determinations on a constant basis.



Mike & Kuma

Interesting discussion about how some people are always pushing volume as high as possible and tweaking the hell out of a system to get that perceived little extra contol so they can turn the volume up a bit more.

I am really referring to a more moderate effect. I think the "sensible listening" volume which our ear's tell us is comfortable and pleasureable can rise as a result of the extra "quietness" in the reproduced music that comes with the system inmprovements, without becoming obviously "louder" to our ears.

Setting aside the relative merits of different supports, mains electricity, cable lenghts etc in an otherwise constant environment I think this effect is an intrinsinc characteristic of qulality component upgrades.

regards
GEOFF
Posted on: 19 April 2004 by JamH
I read somewhere, years ago, that a real [live]concert [classical] is/can-be very load and your ear gets overloaded and distorts. [With pop music it really is loud !!]. So speakers/hi-fi that distorts sounds loud at fairly low energy levels. With top quality stuff it doesen't. But it is loud as you find if you have to leave the room and can hear it all over the house.

I have only once heard how load a real piano can sound in a real room which was at a master class in a smallish room and as the pianist played Messiaen a string broke ...

James H.
Posted on: 19 April 2004 by Geoff P
quote:
I read somewhere, years ago, that a real [live]concert [classical] is/can-be very load and your ear gets overloaded and distorts


James

I don't know the numbers but I believe live classical music in a concert hall, is up the mid 90's on the dB scale. The distorted stuff coming out of the speakers at a heavy metal concert can get into the high 90's and even reach 100dB.

Allowing that dB is a logarithmic measurement scale the difference between 90dB and 100dB is a 10X increase in sound level. This is "LOUD" !!

In my living room when I have the volume on my 282 at 9.00 that comes out of the speakers at in the 85-88dB range and that is loud enough to be about the maximum comfortable contnuous listening level. If I want to really go to the "MAX" I get up to around 90-91dB.

To put that in context that is about 5-7 times quieter than a typical concert in a concert hall and 10 times quieter than at a Pop concert.

I remeber I was once forced to take my son to a Def Leppard concert because an older boy who was supposed to go with him fell ill. Man that was loud. I had a loud hissing sound in my ears when I left at the end of the concert and it took 2 days to go away and for my hearing of conversation to come back to normal.

I am not talking about that sort of pressure level. I 'll stick with the 85-88dB range thanks.

regards
GEOFF
Posted on: 19 April 2004 by o.j.
Hy Geoff! think that for extreme sound pressure
levels in rockconcerts are always used horn tweeters.the reason therefore is that they are
with less power to drive than a hifi tweeter
and a pressure speaker behind a horn will not become damnaged as soon out of heat problems.
But as we know horntweeters give more tonal colouration and mechanical distortion to music
than our hifi tweeters.This distortion makes the music to noise through our ears in our brains.One of the goals of good hifispeakers is
(or should be) nearby no tonal coloration.and
there are not really many amps outside that
can control our speakers at very loud levels.
I am sure if somebody would play(good and loud) on a piano in your rooms you will listen to music.
bringing most hifi systems on the same level(you can measure db in your rooms with electrical instruments and compare loudspeakers
tothe real piano)you will get unbearable noise out of them .And a conventional dynamic speaker can theoretically bring nearby the dynamic of a shoot or an explosion.But therfore is needed an ultrafast
amp with lots of zerodistorted power.
and both the size and the speed of the moving
membran of the speaker are factors of sound pressure level at a given frequencie.biggerSize
of chassis is only nessecary for deep frequencies in conventional sealed speakers.
O.J.
Posted on: 19 April 2004 by Johns Naim
A few quick thoughts...

Relating it to music, as in the Hifi playing music, and not the sound of the HiFi as an end in itself....

Natural acoustic intstruments, aka non electronically reproduced/enhanced ones, such as string, wood, brass etc, all have a complex mix of harmonics that blend together to form the timbre of the instrument. Usually, it sounds rather nice, unless of course you don't like the instrument in question. Or the player/performance, but that's another issue.

All electronic recording/reproducing equipment will add distortion of some kind. With valves, it's supposedly even ordered harmonic distortion that gives valves their supposed smoothness, warmth, and liquidity of sound, as against the odd ordered distortion of transistor designs that gives a harder, faster, tauter and 'edgy' sound.

Upgrade the equipment, thus hopefully increasing the resolution and lowering the noise and distortion, will make it at first seem quieter, as well as more detailed, full, natural etc. Distortion is annoying to the ear, makes things seem louder than they are, and is fatiguing to say the least.

In a concert hall, a symphony orchestra in full FFF, i.e. flat chat in large tuttis etc, comfortably hits around 110db of smooth, effortless, majestic sound. And does it from a whisper to a roar in the blink of an eye. Yet it is smooth, rich, beguiling and entrancing.

At home, one can both underplay, and overplay a recording with reference to the reproduced volume. Underplaying it re relative volumes that relate to musical levels/expression results in generally subtle masking of background/pianissimo parts by louder/fortissimo ones.

Overplaying it brings up the pianissimo parts to an unaturally excessive level, thus compressing the apparent dynamic range, reducing the contrast between soft/pianoissimo and loud/forte, including all the elements between pianissimo and fortissimo such as mezoforte etc.

To be sure, pushing the amp beyond it's comfortable working range into the area where it's distortion increases will add an edge to the sound, that may sound more 'exciting' but it's not about music at all.

It begs the question; is the quest for quality HiFi about listening to the music, or is the music only an end to the HiFi which becomes the end in itself. A great pity if it does, as music is far more rewarding to listen to than any HiFi I have ever heard.

Incidentally, on CD, in my 5x4mtr listening room, made of permanent materials (double brick) the acoustics are on the bright side - usual replay levels are around 8.30 to 9.00 o'clock - mostly I adjust the volume level on individual recordings to suit the pianissimo levels, and let the rest just fall into place, which they do if it's a well engineered and balanced recording. Sometimes a slight adjustment is needed to gain correct musical perspective, but that is all.

Hope this helps, speaking as a music lover who happens to be a HiFi nut....oh the shame of it... Big Grin

Best Regards

John.... Wink

Populist thinking exalts the simplistic and the ordinary
Posted on: 20 April 2004 by o.j.
Aha!we should not have anymore level problems
at home.Kef Q3 can do 112 db and most
other dynamic speakers i know do beyond 100 db. Roll Eyes(in tech specification papers)
An level meter is nothing than a reversed loudspeaker=microphone and a correct measurement of such an instrument means only
db at 1000 hertz (international technical agreement of measurement.)

And in the end you must admit we are dependant
of the amp linearity and power.(resuming that we all have perfect sources Winkand there is nothing than perfect software on the market Razz
.....and there are no lying politicians Big Grin Big Grin Cool

....than i awake. Frown

My personal formula for music reproduction is
Music+ Hifi system = music
Hifi=0
always trying to bring hifi to zero.
an other formula:music+ hifi > music is definitly wrong.
Music+ hifi< music is also wrong but a good starting point (remember tivoli)for the next
upgrade Smile

........only problem i have : what means > or<
in a formula without numbers?

Me(and others) have spent a lot of time and money and are still on the way to find out.....
O.J.
Posted on: 20 April 2004 by Geoff P
quote:
My personal formula for music reproduction is
Music+ Hifi system = music
Hifi=0
always trying to bring hifi to zero.
an other formula:music+ hifi > music is definitly wrong.
Music+ hifi< music is also wrong but a good starting point (remember tivoli)for the next
upgrade

........only problem i have : what means > or<
in a formula without numbers?

Me(and others) have spent a lot of time and money and are still on the way to find out.....
O.J.


O.J.

I am not so sure that a system that breathes life into the music you hear can be expected to equal exactly "0" in your equation. Was'nt that supposed to be one of the virtues of the Digital reporduction process when it was first lauded by the HiFi press and look what years of experience has taught us about that!

I do agree that the formula Music + HiFi must be < MUSIC is a good starting point but it is too general. I don't think you should strive too hard to get to "0", just close enough to reduce the side eefects of the equipment AND still bring "life"to the music. For me the sound I get from my Naim system pleases me as much because of what it brings to the music as for any analytical capability it might have.

regards
GEOFF
Posted on: 20 April 2004 by o.j.
Hi Geoff!My goal is to beware the Life of music
reproducing the music with my hifi!I remember we had a discussion about bringing back lost
prat or life of music and ihave the point of view that it can not brought back.
An the only adding factor of good equipment seems to me that i can better understand the music while not thinking about equipment faults.(same as in a live music performance without electronic equipment.)Ivor would translate this with:follow the tune,an sentence which i like also as a standalone far away from linn or any other hifi equipment.

I remember also that Ivor created Lp 12
on the technical basement of thorens and others that built turntables long before Lp12 was on the market.
thorens is a turntable that will not be often
named i the Lp12p9Xerxes discussions in this forum.The reason is:it is soundwise not in this league.Curious: its technical measures are not worse than that of the other competitors.

IMO we had the parallel evolution in digital.
Philps started with its nearby 2000 euro crap
player in 1984.

Later on cambridge showed as one of the first
manufacturers that digital can sound bearable.
At this time also mission,rotel and others had
acceptable cds,not forgetting the famous nakamichi musikbank for cars.
And soon became wadia a benchmark for analogsounding digital.yesterday i read on the
"who loves lp12"thread that two of our forum
prefere the "rhytmical locking" presentation of a genki and of an naimcd to the "rythm" of a full blown lp12.

Think these are good examples of digital evolution.

And Ampwise we saw a lot of dinosauiers dy during the last decade,and dying will go on.Naim is imo and most others of this forum soundwise on the winning way. goodsound = goodmusic,and good music will
always have life.
O.J.
Posted on: 21 April 2004 by Dev B
quote:
Originally posted by Fredrik Fiske:
_PLAYBACK LEVELS_

...
On the issue of bass to treble balance, mostly people have a clear idea of what they like (and are often disappointed by a real orchestra!) based on no real broad experience. If you go to the Albert Hall, the bass is completely different to say the sonority in the Festival Hall, which is rather dry and actually has bass boosters in it! In my view there is an acceptible range of tonal balances, and as recordings are highy variable as well, this is not something that it pays to get dogmatic about. So the line that says, perhaps, "Speaker X is useless. It does not do enough bass," is futile. Or another that says,"Golly thar speakers is lovely. It does so much bass," is equally so. We show turn round and admit that all these things are opinion, and probably both speakers fall with a reasonable range. Articulation and rhythm precisely relayed is far more important than absolute weight.

With too much weight, caused by over-loud replay, these two areas are ofen the first to slip, not least because the speakers can start to struggle, and then the amp has to work overtime to try to control them. This is often before the upper partials seem to go wrong.

Already too long. Sorry! Fredrik Fiske


Dear Fredrik,

In your few last posts (esp. on this post and your NAP300 posts) I have concluded that I agree with so much that you have said, but since you have said it in a more elegant way than me, I just write a post like this to tell you how much I agree.

regards

Dev
Posted on: 21 April 2004 by o.j.
quote:
Originally posted by Fredrik Fiske:
Final thought:

A system must have the capacity to be louder than natural, but a really great system is one that can give you the focus as if your in the cheap seats at the back. Low level detail retention is crucial. If you are interested here is what I wrote about the 300 some weeks ago, which excelled in the area. It might also put into perspective how I listen with regard to the above.

FF
Hy Fredrik! i have read your 300 text.
It is to me a matter of fact that natural(non amplified )instruments are the only basement for a correct comparision Life music vs.Hifi.
Exceptions are if the amped instrument is playing about its own,dedicated amp and speaker(electricguitar + amp+ speaker i woud also
specify as an natural instrument)I know this is not correct but an e guitar without amp no longer an e guitar,and also it is not an acoustic guitar.(no sound any more)

Speaker/amp feedback is easier to get right with small speakers.(the price for the accuracy is payed by missing deep frequencies,a thing
that is definitly n o t the first important part of music reproduction.(of course bigger speakers are able to bring deeper frequencies,
but often not with best quality(amp synergy problem)

Room/speaker synergy seems to be sometimes totally underrated by speaker builders or consumers who place their expensive speakers wrong.

Intention should be n o listener of axis reflection in listenig room,and therefore no
adding rflections to original recorded ones.

I personally think also that Preamp/amp synergy
is underrated:Faults come out of preamp and become therefore bigger in amp,and than amps faults are added.

And as you said:The right(real)level is also imo one of the most important things to judge reproduction of music.


O.J.
Posted on: 21 April 2004 by Geoff P
quote:
Fredrik

On the issue of bass to treble balance, mostly people have a clear idea of what they like (and are often disappointed by a real orchestra!) based on no real broad experience. If you go to the Albert Hall, the bass is completely different to say the sonority in the Festival Hall, which is rather dry and actually has bass boosters in it! In my view there is an acceptible range of tonal balances, and as recordings are highy variable as well, this is not something that it pays to get dogmatic about. So the line that says, perhaps, "Speaker X is useless. It does not do enough bass," is futile. Or another that says,"Golly thar speakers is lovely. It does so much bass," is equally so. We show turn round and admit that all these things are opinion, and probably both speakers fall with a reasonable range. Articulation and rhythm precisely relayed is far more important than absolute weight.

With too much weight, caused by over-loud replay, these two areas are ofen the first to slip, not least because the speakers can start to struggle, and then the amp has to work overtime to try to control them. This is often before the upper partials seem to go wrong.


AND
quote:
O.J.

Speaker/amp feedback is easier to get right with small speakers.(the price for the accuracy is payed by missing deep frequencies,a thing
that is definitly n o t the first important part of music reproduction.(of course bigger speakers are able to bring deeper frequencies,
but often not with best quality(amp synergy problem)

Room/speaker synergy seems to be sometimes totally underrated by speaker builders or consumers who place their expensive speakers wrong.

Intention should be n o listener of axis reflection in listenig room,and therefore no
adding rflections to original recorded ones.


Fredrik & O.J.

Your points about system quality are in line with my experience travelling along my upgrade path. To be honest my analogy about volume needs to be qualified. I take on board all that has been said in this thread about not needing to drive a properly balanced quality system to very loud levels to bring music to life. I am talking more about the pleasure that comes from being able to increase the normal listening level as a result.

I also agree with what has been said about speakers and their role in this effect. It is here that a strong power amp comes into it's own. My original 150 for example delivered a nicely balanced sound WHEN not being driven too hard. The current 250mkII with the same speakers, shows what a difference having a power reserve makes to the sound levels that put the old 150 under pressure. I am not talking about over-loud sound but about being able to drive the system well enough to compensate for speaker and room effects.


In the listening home a quality system should be able to make a good attempt at acheiving the balancing act that is necessary to come close to the "original". I know this can be argued for ever with respect to the "interference" both intentional and unintentional that the recording process brings, the room effects, the resolution of the source components and as O.J. points out the role of not just the amp but the pre-amp.


What is needed to address all these issues, raised by the discussion, is covered by the terrible but usefull word "Headroom". I think it has a fairly well understood meaning in HiFi terminology.

I stick by part of my original comment at the start "So this source first stuff has it merits BUT make sure you add some oomph in the power amp department".

But would change the last bit to say "because as the dynamics and cleaness of delivery improve, it will be difficult to resist the pleasure of running at the higher volume this allows, especially if it does'nt bring a feeling of strain and start adding distortion to the sound"

regards
GEOFF
Posted on: 21 April 2004 by o.j.
Hy geoff and frederik!From the beginning of this thread
i had the feeling that the "headroom"will become an important(maybe the most important )Question.Because the room reflections of a n y
room are different.All other factors are tested
by manufactureres of Hifi components to the
limit of technical possibilities (speaking about analog reproduction and n o t about the situation that digital processors get better and faster and are nowadays as good as analog
sound production (theoretical)ever has been.
So here the headroom:
1,there is n o amp on the market that k n o w s the room where reproduction of production will be .
2,there are no speakes onthe market that k n ow
where reproduction of production will be.

3,The headroom of production is given byRazzroduction room (studio,concert hall,club)
and the placement and quality of recording microphones.(not talking about mixers and equipment which changes sound electronical)
4,for reproduction this point 3 is given.
Only variable of point3 concerning reproduction is the level.(as geoff,frederik and me have the same opinion!)
So let us look at 1 and 2.
It is possible to adapt an amp with room corrector system individual to an room.this can be made by equalizing and can be measured
with given speakers, on listener place.
correcting amp(or better preamp) means nothing other than changing amplitude
of signal.theoretical it must be done very often and fast at any level and frequencie and
imo it is only possible with fast processors and a lot o f programming and it will only work
on o n e point of listener room.(not correcting
time(phase) ,because this will destroy productiongiven headroom.So you see our naim preamps and even the best conventional preamps available c a n n o t dothis.(no processors).
The speakers:Speakers reproduce music by recorded amplitude and time(phase)on only o n e
listener place.(there was also only o n e microphonplace in production(theoretically and ideal).And here comes the goal:speakers should havelimited off axis response because of listenerroomresonances.( Vertical and horizontal.)all headroom information is in the
electrical signal timewise and frequenciewise
coded.(recorded with the microphones)
Naims idea of wallplaced speakers is nothing
other than to limit the factors (position of speaker to frontwall is given and so frontwallresonances are better preknown than in (how far??)off wall cocepts

Room absorbers do nothing other than to adsorb
added resonances of listener room(also away to keep information of original headroom)


knowing this all should help on the way to a good sound Roll Eyes......or to the next pub for a beer
O.J. Wink
Posted on: 22 April 2004 by Geoff P
O.J.

I'll second the next beer idea. Actually alcohol can be quite effective as a sound correction device. Ha! Ha!.

I found your discussion of Headroom excellent. It is interesting that the advent of the digital processors in home cinema receivers has brought some quite sophisticated room correction options. Of course the complexity of multi-channel sound have prompted this BUT it is attractive to have the option to place a microphone where you will sit to listen, hit go, and have the equipment re-equalize itself based on measurements from the microphone.
Bang & Oulfsen have done it with their rather odd shaped Active speakers. Of course us HiFi nuts shudder whenever B & O is mentioned and cast it aside as the ultimate home designer driven hardware BUT this particular product is a brave attempt by B & O to be taken seriously again in HiFi.

It does however raise the dark sceptre of EQUALISER's, which were all the rage 20 years ago. In those days they were crude and relied upon the hearing of the listener and his adjustment skills. I will admit I had a SONY "HiFi" stack a long long time ago which did not have tone controls but instead an equalizer with 7 sliders. As I am sure a lot of young people did I ended up overemphsising the Bass and reducing the treble, rather than striving for a natural sound.

Therin lies one of the old problems of room equalisers IF they rely on the human ear. Now we can use a computing system to work out equalisation for the listening room we have a far better tool.

So we end up with another of the famous arguments. When it comes to HiFi stereo.
1) Is it better to do the best we can to keep the signal as pure as possible during amplification and compensate for room effects as best we can by trial & error speaker and seating positioning?
OR
2) Is it better to take this so called pur signal and tailor it artificially in a highly controlled way using a computer driven room equalisation circuit based on in room microphone measurements?

Of course we should be honest and accept that soembody at a bloody great equaliser, disguised as a studio mixing deck, has already "equalised" what we have to work with as a "starting" sound before we ever get to amplify it ourselves.

regards
GEOFF
Posted on: 22 April 2004 by o.j.
HI Geoff !1.Point is the rigth way.

Something i did not say in my post:serious built speakers have a nearby linear frequency
range from bottom to top.(speaker constructors try to build housings (passive) crossovers and
chassis placement near to the optimum of no phase shiftings.Only a simple equalizers that changes amplitudes of frequencies (not length of amplitude)can destroy the mechanical phase balance between chassis.(do not forget the whole speaker will give now quite another non linear frequencie spectrum than it had before
and therefore its mechanical thiele and small parameters will be(artificial) wrong. Speakers balance of its own is a factor that is same or better more important than the
room reflections.(bring your speakers in your garden or a free field and do the test with an equalizer,and you will notice that you can make them sound crap also without room reflections.

so the truth is:linear(naim Wink amps and linear speakers
( logical only possible without processors,out
of the reasons i named before ).
and perfect positioning of speakers and listener in an (theoretical )non reflecting room.
acoustic is physics of moved air and amps are needed to magnify this,therefore loudspeakers are amps tools. being in a linear logaritm with physics (nothing other is our try of (analog)recording and reproduction of music,transforming acoustics to voltage by induction ).
but amps c a n n o t change the physics with an artifical system built on a basement that is far away of beeing congruent to physics and not even in a related alogarythm to physics.

And Geoff this (your thread)is really intresting.


....and all who read this excuse my bad english.
O.J.
Posted on: 23 April 2004 by Geoff P
quote:
....and all who read this excuse my bad english.
O.J.


Hey O.J. I think you are expressing it pretty well especially given english is not your home language.

You said:
quote:
so the truth is:linear(naim amps and linear speakers
( logical only possible without processors,out
of the reasons i named before ).
and perfect positioning of speakers and listener in an (theoretical )non reflecting room.
acoustic is physics of moved air and amps are needed to magnify this,therefore loudspeakers are amps tools. being in a linear logaritm with physics (nothing other is our try of (analog)recording and reproduction of music,transforming acoustics to voltage by induction ).


So as I understand it in an "ideal" system the loudspeker would be just that, a single full range unit with no need for the complication of multiple transducers and the crossover, which I assume Horn speakers come close to. I sse what you are saying about aiming for an absolutely linear response in theory.

But do our ears have a linear response?

Another thing that is a fact of life is the vast majority of listening is done off axis and in typical european rooms (small) the reflected sound coming from the side walls delayed by a few milliseconds, is signidicant.

So are these magic things people are always talikng about called "stereo depth" and "sound stage width" really created by the non-ideal rooms we listen in and the offaxis and reflected time delayed sounds included in the total sound field?

In fact since we virtually all listen in non-ideal ways is there any point in aming for the ideal, would'nt it be better to intentionally model some typical room sizes and create an average design which approximates the norm?

regards
GEOFF
Posted on: 23 April 2004 by o.j.
Hy Geoff!Brodband speakers are ideal out of their homogenity.But there are problems of acceleration,and gravitation concerning high
frequencies.a tweeter can out of his low mass
more exact follow an electric high frequencie
signal.(there are also tries with extrem low mass chassis (like podszus görlich chassis)to
make bigger chassis faster)
the second thing is that tweeters are small and
therefore less phase problem out of its own(smaller) surface(tweeters are often controlled by an mechanical (phase plug or lense infront of them to hinder them swing uncontrolled)
an effect similar to oil damping in car shock absorbers.( in the tweeter example the air between lens and tweeter will damp working as an air pillow.if a tweeter starts to swing
in another way than a piston(front/back)you will recognize this as an distortion.

Inlinearity of our hearing:
no problem:it is there in real life and it will
be there in a non corrected reproduction.If theoretical)our equipment is linear.

so y o u r hearing(ears,Brain) adds non linearity to a l l acoustic events(or reproductions)

Off axis:normally you listen relatively on axis
to music performances or if one or more people are speaking infront of you (off axis listenin will diminuish horizontal direction feeling of
a tone. also if you hold a hand surfacing one ear you will loose Your" anatomic "time difference processor to localise direction of sound.(T w o ears :difference of time and frequencies decoded in your brain).....and basement for stereo reproduction.

what is done in life of axis, is hearing n o t
listening as we do to music or hifi.(want to say listening is concentrated,concious willingly hearing)

ideal room:free field or acoustic death room.
in death rooms are speakers standing on a gitter to put away also floor reflections(that you have on the free field.

ideal speaker:the one that would have as less as possible synergy with the walls an ceiling
of rooms and has also not the tonal coulured and extrem on axis sound of a horn.this becomes more nessecary the higher
the frequencies are.(does of course not work on the wall behind listener that is logical on axis ,but nature helps us here by the form of ourouter ear).

Compare it to an headphone:wherever you listen
to it sound is always the same.
you are used to do this and you know there you can hear also a lot of different "rooms" given py production and without listener room
reflection.(of course headphone is an unnatural
hearing,but i think its good for the example
that there are d i f f e re n t headrooms w i t h o u t listener room reflection
by production.

Last thing: on free air you need a lot more
amp power to bring the same "sound energy" to
listeners ear than in aroom.


I am far from a religous flatearther(think only there is tonality sometimes too less important) but i know that round earth hifi ideas are definitly physical wrong because often negating the factors t i m e and therefore P h a s e. and music is nothing
other than right tones in right t i m e.(and right level.)

So tell me :w h i c h Confused other goal could have reproduction?
Roll Eyes Wink Razz
Posted on: 23 April 2004 by o.j.
Hy Fredrik!
Hearing nonlinearity:increases at very low levels.Is l e s s there at high levels.
means Bass and treble seem to be reduced
at low level.therefore hearing linearity is only important concerning reproduced sound levels difference to level of production.


you,me and all othes here have the right to hope that Soundingeneers know out of there
know how and experience how to choose,place and
use microphones.(if not: bad luck ,software is given.)

Hifi is a technical norm for the components we use and says nothing about the sound that reach
your ears.(play old big infinity kappas with an 7 watt tube amp ,and you know what i am talking about.)

I agree completly about what you say concerning room reflection.

O.J.