Tagged With "hum"

Topic

SuperUniti Stand-by Concerns: Hum + Hiss + £40 per year

AdamSU ·
Dear SuperUniti Owners, I just joined your ranks by buying a SuperUniti last week and setting it up. I am really pleased with the performance and connectivity but have 3 queries about leaving it on when not in use as is recommended: 1. Transformer Hum: As per another forum post I too immediately noticed the transformer 'hum' sound when turned on which is audible from 4-5 metres across the room and even faintly down the hall (irrespectivie of the Signal Ground Switch setting). Once music is...
Topic

Can UQ2 suffer from humming PSU ?

Alco ·
Hi guys, I bought a s/h mint Nait XS about 4 months ago. Sounds great and my plan was to find a s/h ND5xs to go with it, but... just as I experienced with a Nait 5si two times in 2014, it suffers from an annoying transformer hum, every now and then. I know that it's not a defect of the amp itself. It's mains polution that's to blame! (I installed the amp at a friends house and it has been deadly quiet for a week!) The humming occurs a few times a day, in time laps of appr. 10 to 30 minutes.
Topic

Hum from 555ps

N500series ·
Hi everyone,I bought 500 series for 6 months, but recently I found that there is noticeable hum from 555PS, especial when I turn it on it decrease after some minutes (I don't know there was or not before).Is it normal or anyone faced this ...
Topic

Nait earthing hum RCA-DIN solution?

0x80 ·
I'm using a Nait 5i with a Beresford DAC connected using RCA. I experience a loud hum which I didn't get when using the DAC my previous amp. After searching the forums I discovered that the problem comes from the fact that the Nait doesn't connect the...
Reply

Re: Nait earthing hum RCA-DIN solution?

0x80 ·
The din-rca converter didn't make any difference. Apparently there is no real difference in the way my Nait connects the rca shields from the way the common ground on its DIN socket is connected. This leaves me with one more option I think. I could try to use a cable with a "floating earth" design. As far as I understand this means that the cable would not connect both sides of the screen/ground. I am going try a hack where I just cut the shield connection from one side of a cheap rca-rca...
Reply

Re: Nait earthing hum RCA-DIN solution?

0x80 ·
Cutting the ground from one side of an rca cable sounded horrible, with more hum then ever. Maybe it's not the same as a real floating earth design though... It's weird. I now seem to have acceptible hum levels even without connecting the rca shield to earth as I did before. Regardless of the type of connection (din/rca) they both are ok now. I can only hear the hum now when I'm close to the speaker and turn up the amp by a fair amount. The old hum levels are back once I touch the casing of...
Reply

Re: Nait earthing hum RCA-DIN solution?

DavidDever ·
The CD input on the NAIT5i is lacking a connection between the left ch RCA ground (if I recall) and signal ground, for performamce reasons - other inputs will tie both channel's RCA grounds to signal ground. If the source ties both ch to signal ground electrically at the output, use CD - therefore only one ground will be connected.
Reply

Re: Nait earthing hum RCA-DIN solution?

SGY ·
Dave, is that the same for Naim's preamps as well? I've wondered whether using the CD input on my 122x for my analog rig would be better.
Reply

Re: Nait earthing hum RCA-DIN solution?

0x80 ·
Thanks to all who replied. I'm going to try a cheap din-rca cable to see if it makes any difference. The issue really seems to be related to the fact that the nait doesn't connect the rca screen to the ground. Connecting the dac to my blu ray player through analog connection only solved the problem for a little bit. The hum returned. I now connect an rca cable to an unused rca connection on either the dac or the nait and then connect the screen of the other end to the ground of my power...
Reply

Re: Nait earthing hum RCA-DIN solution?

Richard Dane ·
I've personally never had any hum issues connecting a wide range of non-Naim sources into any of my Naim pre-amps. All have been connected via either Naim or Chord Chrysalis RCA-DIN interconnects, so it would be worth giving one a try to see whether it solves your problem.
Reply

Re: Nait earthing hum RCA-DIN solution?

0x80 ·
I investigated the issue some more, and it's not related to the cable type it seems. I've tried RCA between the Nait and my blue ray player and there is no hum whatsoever. Normally it's connected to my DAC using Toslink. That gave me the idea to connect the blue ray player to the DAC using SPDIF instead of Toslink, and the hum magically disappeared! So simply put I can connect the DAC to my amp, as long as the signal ground on one of its (non optical) inputs is connected to a device which...
Reply

Re: Nait earthing hum RCA-DIN solution?

maze ·
I had the same problem with a wadia ipod doc connected to my dacmagic into my nait 5i, the only solution that worked was a earth cable from my dacmagic (by loosening a panel screw and wrapping the earth cable around the screw before tightening with the other end of the earth cable attached to the earth post on my mains distribution block). I tried a balanced xlr to din with no success. Hope this helps.
Reply

Re: Nait earthing hum RCA-DIN solution?

the_young_once ·
0x80, I'm using a Beresford 7520 myself with Nait 3R, no hum or whatsoever, connected by "radio shack" RCA-RCA interconnects, and similarly priced "radio shack" RCA(female)-DIN(male) convertors at the Nait end, so I would suggest you follow Richard's advice and try some RCA-DIN type wires from Naim themselves or Chord; I'm just pointing out that if budget is an issue, which it is for me (student), you could try it ghetto style first like mine, to ascertain if DIN inputs eliminate the hum,...
Reply

Re: Hum from 555ps

Engelbert ·
Yes - hum is completely normal. Forget about it. Hum from power supplies does not indicate a problem. It merely indicates that the power supply is switched on. Engelbert
Reply

Re: Hum from 555ps

Richard Dane ·
And best to leave equipment powered up as much as possible for optimum performance.
Reply

Re: Hum from 555ps

Steeve ·
Except you will forced to switch NDX, Uniti or Unitiqute products off and on again from time to time due to a number of bugs/features!
Reply

Re: Hum from 555ps

Simon-in-Suffolk ·
Hi, yes everyone says you should accept it, and it will vary over the day depending on your mains quality. The more DC offset that occurs in your mains often the louder the hum, and this in turn is often caused by loading of your supply at your substation. Hum will be often louder in the evening on domestic feeds, and during the day on industrial ones. Simon
Reply

Re: Hum from 555ps

hungryhalibut ·
A dedicated mains spur for the hifi will often help to reduce hum, as well as improving sound quality generally.
Reply

Re: Hum from 555ps

sbilotta ·
Hi, I too have a 555PS that hums, more than my other 500, 552 and XPS PSs. My dealer sent it to the distributor who acknowledged the hum and sent me a 555PS that he uses for his demos, to see if it was simply my mains or what; his 555PS doesn't hum at all but the most interesting thing is that my other PSs do not hum anymore ! So it would seem that PS hum is not always 'normal'... Not sure how to solve this issue though; let's see what our distributor will do after he comes back from the ...
Reply

Re: Hum from 555ps

Engelbert ·
Originally Posted by sbilotta: Hi, I too have a 555PS that hums, more than my other 500, 552 and XPS PSs. My dealer sent it to the distributor who acknowledged the hum and sent me a 555PS that he uses for his demos, to see if it was simply my mains or what; his 555PS doesn't hum at all but the most interesting thing is that my other PSs do not hum anymore ! So it would seem that PS hum is not always 'normal'... Not sure how to solve this issue though; let's see what our distributor will do...
Reply

Re: Hum from 555ps

Mike-B ·
There is a lot of posts on hum, suggest you search on "hum" But its all more or less covered here Transformers hum, some more so than others & its not necessarily model specific Mains DC offset (pollution) makes whatever hum that much noisier & will vary dependant on time of day in some cases.
Reply

Re: Hum from 555ps

sbilotta ·
Originally Posted by Engelbert: For what it's worth, because no two transformers are identical, I'd conjecture that some transformers will hum more than others in a given environment. Thus, it may not be a cause for concern - so long as each transformer is performing within the usual/acceptable parameters (however that might be measured). I totally agree with you, and I "measure" how acceptable it is by ascerting how invasive the hum is i.e. if I can hear it hum from my listening position...
Reply

Re: Hum from 555ps

Gale 401 ·
Are you sure its not caused by this?
Reply

Re: Hum from 555ps

T38.45 ·
I must say that I really love my Naim gear ...but I sold it now after 20years because I couldn't stand the hum....it was too much for me and too much for my wife as well. Even with a distance of 3m away from gear the noise was there! It's getting louder and louder after 9o'clock pm and I had to switch off the whole stuff each evening..... Had to spend more than 1500€ over the years in noise reduction things (new ground earth, new electrical lines, diff. noise filters etc) but it didn't help...
Reply

Re: Hum from 555ps

Simon-in-Suffolk ·
Ralf, that's really sad to hear and i feel for you. It sounds like your mains was in quite a poor state, I guess most transformers are going to hum for you? I understand Linn use switch mode power supplies in their streamer sources so no poor mains quality related hum but they have other challenges as associated with all SMPS, that good quality, well designed and extensive RF filtering can and should deal with. However I have never measured Linn's SMPS with a bandscope, but can probably...
Reply

Re: Hum from 555ps

T38.45 ·
Hi Simon, thanks! You are right, even the trafo from my wlan router makes some noise ( not that loud but you can notice it...) The Linn gear is dead quite... Ralf
Reply

Re: Hum from 555ps

Engelbert ·
Originally Posted by T38.45: I must say that I really love my Naim gear ...but I sold it now after 20years because I couldn't stand the hum....it was too much for me and too much for my wife as well. Even with a distance of 3m away from gear the noise was there! It's getting louder and louder after 9o'clock pm and I had to switch off the whole stuff each evening..... Ralf This story is sad but also a little bizarre....... If the hum was so distressing, I'm rather surprised you suffered it...
Reply

Re: Hum from 555ps

T38.45 ·
The humming gets more and more over the time! I guess they change the power conditions where I live now, it was not that much in the places I lived before! And again- this has nothing to do with the sound of Naim....it's still fantastic!
Reply

Re: Hum from 555ps

kenley ·
All your Naim kit will have a screw on the bottom for use as an earth (ground) terminal. Connect a green and yellow earth (ground) wire to your unit(s) using said screw(s) and run it/them to an earthing distribution block then connect another length of the earth (ground) wire from the distribution block to an 'earthing (grounding) rod' driven into the earth in your garden. If you do not have a garden you could make the final connection via a mains plug using only the earth terminal then plug...
Reply

Re: Hum from 555ps

Richard Dane ·
Originally Posted by kenley: All your Naim kit will have a screw on the bottom for use as an earth (ground) terminal. Connect a green and yellow earth (ground) wire to your unit(s) using said screw(s) and run it/them to an earthing distribution block then connect another length of the earth (ground) wire from the distribution block to an 'earthing (grounding) rod' driven into the earth in your garden. If you do not have a garden you could make the final connection via a mains plug using only...
Reply

Re: Hum from 555ps

Sloop John B ·
Originally Posted by Lord Emsworth: A dedicated mains spur for the hifi will often help to reduce hum, as well as improving sound quality generally. often but alas not always but the SQ improvement made it very worthwhile for me. SJB
Reply

Re: Hum from 555ps

Former Member ·
A balanced power supply will get rid of the hum - at least the one I tried did. The ISOL-8 mains block will also remove DC from the mains. There is no noticeable effect on SQ in my system with either method - it just stopped the mechanical hum. However, the mechanical hum is almost inaudible in my current set-up, so I don't bother we these devices, but I would if it came back and annoyed me.
Reply

Re: Hum from 555ps

Sloop John B ·
Originally Posted by Guido Fawkes: A balanced power supply will get rid of the hum - at least the one I tried did. The ISOL-8 mains block will also remove DC from the mains. There is no noticeable effect on SQ in my system with either method - it just stopped the mechanical hum. However, the mechanical hum is almost inaudible in my current set-up, so I don't bother we these devices, but I would if it came back and annoyed me. I thought the general consensus (if there ever is such a thing)...
Reply

Re: Hum from 555ps

Simon-in-Suffolk ·
Depends on the 'conitioning' being applied. A 1-1 coupling transformer will remove the DC and provide pure AC on the output. However you would need a good tquality transformer, and that would start humming instead of the 555PS, but I guess you could have it in a separate room. Simon
Reply

Re: SuperUniti Stand-by Concerns: Hum + Hiss + £40 per year

Dunstan ·
Maybe it's too late to reply to this thread but my feeling on standby power is that it is simply a form of background heat in your room that ultimately offsets the energy used by your heating system for the express purpose of providing warmth. The true incremental energy cost of standby power (if there is one) is not the absolute energy consumption of the standby device, but the difference in energy efficiency between the electric powered standby-device 'radiator' and the the gas or oil or...
Reply

Re: SuperUniti Stand-by Concerns: Hum + Hiss + £40 per year

Yippedidou ·
No hum, no hiss here...Close to 1 year with my SU and still loving it Yip
Reply

Re: SuperUniti Stand-by Concerns: Hum + Hiss + £40 per year

Julian H ·
The hummmmmm is the upgraded flux capacitor. Its only just been released, you are lucky to get the latest model. Put a switch in your speaker cable to stop the hissssssss when not listening.
Reply

Re: SuperUniti Stand-by Concerns: Hum + Hiss + £40 per year

jobseeker ·
No hum with mine. As far as hiss goes, I would not be worrying about something I could only hear within four inches of the 'speaker. It's normal and mine is similar, though it depends on 'speaker characteristics. It shouldn't shorten the 'speaker life. As for not liking the electricity costs, I take the point but it is the price of owning Naim. Imagine the costs for the multi-box Naim crowd !
Reply

Re: SuperUniti Stand-by Concerns: Hum + Hiss + £40 per year

Julian H ·
Marty, Marty, we need 1.21 jiggerwatts. Where is that bolt of lightning?
Reply

Re: SuperUniti Stand-by Concerns: Hum + Hiss + £40 per year

California Jim ·
Adam, you haven't said what is connected to your SUniti. The SU itself should not be emitting a hum, buzz or hiss. Unless there is a fault within the SU, the problem is due to an input. Until last week, I had a hum/buzz through my 805s when using vinyl only. All others inputs created clean sound. I assumed it was an earthing problem coming from the Stageline or 3rd party PSU. The connector I was using Was Din to RCA input. I finally decided to try a Din to Din connector, and to my surprise...
Reply

Re: SuperUniti Stand-by Concerns: Hum + Hiss + £40 per year

dzambolaja ·
Originally Posted by AdamSU: 3. Stand-by Electricity Cost: £40 per year: The SuperUniti reference manual final page notes that the SuperUniti consumes 35 Watts of power in idle state (Quiescent consumption), meaning approx 306 kWh per year and at 13p kWh is around £40 per year. This is a price I am willing to pay but will represent 8% or so of power consumption in our house annually (double the energy use of our fridge-freezer for example) before it even drives 1db of sound (except items 1...
Reply

Re: SuperUniti Stand-by Concerns: Hum + Hiss + £40 per year

jobseeker ·
Jim If you have no hiss at all from your loudspeakers with the SU even with your ear close up to them, that would be unusual, as it is a perfectly normal phenomenon. There should be no buzz though, as we're talking about transformer buzz in this context.
Reply

Re: SuperUniti Stand-by Concerns: Hum + Hiss + £40 per year

Renner ·
I too hear a transformer hum from my SuperUniti. It is not very loud, but loud enough, and I actually find it quite annoying to have this sound in my living room when the SU is powered up. I am – by the way – on my second SU. The first one was noiseless, but was replaced by the dealer due to a fault in the streamer board (excellent service from the dealer though). Before I got the new one, I borrowed a demo SU from the dealer, which was much noisier … with a level of noise that in my opinion...
Reply

Re: SuperUniti Stand-by Concerns: Hum + Hiss + £40 per year

FritzCD ·
Originally Posted by dzambolaja: Originally Posted by AdamSU: 3. Stand-by Electricity Cost: £40 per year: The SuperUniti reference manual final page notes that the SuperUniti consumes 35 Watts of power in idle state (Quiescent consumption), meaning approx 306 kWh per year and at 13p kWh is around £40 per year. This is a price I am willing to pay but will represent 8% or so of power consumption in our house annually (double the energy use of our fridge-freezer for example) before it even...
Reply

Re: SuperUniti Stand-by Concerns: Hum + Hiss + £40 per year

Adam Meredith ·
You could always turn it off when not in use - which would solve all of your problems as the music should mask the hum and hiss. Many Naim users don't leave their equipment on all the time. I have to fire mine up between thunderstorms in the summer - there are compromises one makes.
Reply

Re: SuperUniti Stand-by Concerns: Hum + Hiss + £40 per year

AdamSU ·
Thank you all for the quick replies - shows how active the forum is which is great. Bobby - I don't really care about the £40 annual stand-by cost - I just listed it for completeness as it may be important to some people or at least interesting to note the stand-by cost is double the cost of running a family size fridge/freezer or 40 plasma tv's. I wouldn't have predicted that. Items 1. transformer hum/buzz and 2. speaker hiss are more my concerns. On item 1 I am going to do more...
Reply

Re: SuperUniti Stand-by Concerns: Hum + Hiss + £40 per year

Adam Meredith ·
Originally Posted by AdamSU: I suspect Naim recommends we leave the amp turned on because turning off and on adds stress to the unit (like any electronics equipment) so the more frequently powered off an on will decrease internal component life and lead to more warranty claims. As a solid-state device it should be stable within a short period of listening and so leaving on 24x7 having anything to do with sound quality I suspect is a red herring. And I suspect you are wrong. Naim recommended...
Reply

Re: SuperUniti Stand-by Concerns: Hum + Hiss + £40 per year

fixedwheel ·
Originally Posted by AdamSU: Bobby - I don't really care about the £40 annual stand-by cost - I just listed it for completeness as it may be important to some people or at least interesting to note the stand-by cost is double the cost of running a family size fridge/freezer or 40 plasma tv's. I wouldn't have predicted that. Only true if you never take the plasma TVs out of standby mode, but there would be no point in having one if you leave it in standby mode 24/7/365 would there? Have a...
Reply

Re: SuperUniti Stand-by Concerns: Hum + Hiss + £40 per year

dzambolaja ·
It is the capacitors inside that are not so "solid" despite the whole device being generaly considered as a solid-state equipment. The transistors warm up in a split of a second but the caps are a different story. They can be filled with a powder-like or sintered particles, even dense liquid and as such their dielectric properties are not linear with the temperature gradient (which itself has transients). Bobby
Reply

Re: SuperUniti Stand-by Concerns: Hum + Hiss + £40 per year

Hook ·
Originally Posted by Adam Meredith: ... Fill in your registration, get 5 years and switch it on/off to your heart's content. But only in the UK, right? Would be great if Naim offered extended warranty to owners worldwide, but I assume the cost of doing so is prohibitive. Still, seems like with most solid state equipment, either problems are discovered in the first day or two...or they just run. So perhaps the cost of years 2 through 5 isn't all that high, and Naim should reconsider a...
×
×
×
×