AV2 Background Noise

Hi there, answers as follows -

1)Fronts : NAP250 (Has also been a NAP150 which exhibited the same problem)

Centre, and Surr. - NAPV175

Both connected via black snaics.

Front speakers - Ariva
Centre speaker - N-Cent
Surr. speakers - N-Sat's

All connected via NACA5

That's about it output wise - can't think of anything but speakers that takes a signal from the AV2, everything else just provides one to the unit.

2) Seems specific to the front channels although I listen in stereo more than 5.1 (And Blade Runner that I was watching last night is a Dolby 2.0 soundtrack) It is unlikely to be the 250 as I had the same problem with the 150.

3) No extra preamp at the moment - I've had a 202 and a Nait5i there before but it's just the Av2 at the moment while I explore some options for a music only Pre.

4)I've seen it on different sources ie XBOX and Arcam DVD player so unlike ly to be both (Although never say never I guess)

Thanks again
Dan

Sorry of course the 250 isn't a black snaic it's a black cannon - DIN cable (Made by Naim) I always forget the 250 isn't a DIN connector.

Aha!

I suspect then it is due to instability between the 250/AV2. You may need to get your 4 to canon lead slugged.

Can you mail:- info@naimaudio.com and specify for my attention

Av

but it was the same with the 150?

quote:

Originally posted by dan scott:
but it was the same with the 150?

The problem is everyones systems are slightly different and what happens in one, may not happen in others.

If something else in the vicinity of your AV2 and 250/150 is radiating RF, this may may happen as you have described. Sometimes even moving interconnects away from other devices has been known to help.

I suggest modifying you exisiting lead or obtaining a new "slugged" version. This would probably cure this in either setup.

quote:

Originally posted by KC:
Dave

I already have and in fact they have written to Naim as well. Thanks

KC has your dealer contacted you yet?

quote:

Originally posted by AV@naim:
Dave's correct. If you use 2 and 3 of the xlr at the dreadnaught end, any earth loop to the amp "should" be broken. On the tag unit, shorting 1 and 3 gives the av bit an earth so ought to stop any hum.

In answer to the last question: no, it's caused by there being (at least) two earths in the system, which is pretty common in av setups.

(Always consult your dealer or qualified personel before ANY earth modifications...).

Dear AV@Naim

My local dealer forwarded your email with the message to refer to your post (see above). As you know, we have gone further along.

Have you contacted them again in the last few days?

KC

yes...

Dear AV@Naim

OK, I will check with them today. Thanks again.

well it's doing it again...


Watching Indiana Jones and in comes a quiet scene and static in the background

I disconnected the coaxial cable from the dvd player and it's still there so definetly source independant. I then disconnected all other cables from the back of the AV2 (Not the power amps obviously as then the noise would definetly go away along with all other noise!) No change still crackling away.

Then I went round and turned off the fridge, freezer, oven etc etc no change to the AV2.

Really getting me down the fact that a £2,500 audio processor can't let me watch a quiet dialogue scene - I could of saved thousands and gone for an Arcam AVR350 that I doubt would of done this - my old Harman Kardon AVR8500 (Not a budget piece of kit by any means) didn't do this at all.

I also tried the same DVD over an optical connection and it was the same. I don't notice it with 2 channel music because I don't have to turn up the volume as much as a DD/DTS disc that needs turning up more.

I don't think slugging a lead will do a great deal other than meaning I have to turn everything up more and loss of overall signal to the poweramp.

Any other suggestions? I'd rather not sell it as when the sound other than the crackle/hiss is fantastic but I'm not happy at such an expensive piece of equipment not doing what it should.

A friend of mine has a Meridian G68 and is going to bring it over for a night soon, interesting to see how it performs with regards to this issue.

Thanks
Dan

If I select CD input (Naim CD3 to AN1 input) and turn the volume up with no CD in so I can hear the crackle clearly it's not there on direct mode but as soon as I engage the digital circuitry in stereo, mono, Neo6 etc the hiss starts. Could this point to a fault?

Dan

quote:

Originally posted by dan scott:

Really getting me down the fact that a £2,500 audio processor can't let me watch a quiet dialogue scene - I could of saved thousands and gone for an Arcam AVR350 that I doubt would of done this - my old Harman Kardon AVR8500 (Not a budget piece of kit by any means) didn't do this at all.

I don't think slugging a lead will do a great deal other than meaning I have to turn everything up more and loss of overall signal to the poweramp.

Dan

Dan,

Whilst I realise this is frustrating, I hardly think that your comment is fair.

Mine does not do this, the majority of units do not do this...although it can happen in a minority of systems. Everyone's system will differ slightly in setup, so you can't expect 100% pass rate every time. What we can do is help you sort this out.

What it usually boils down to in the end is:-

-if the unit IS electrically faulty then no amount of tweaking etc will help.

-earthing of multiple sources connected to the AV processor, causing loops. (and possibly aerial/sat feeds)

-Instability between AV processor and amps

Why are you so sure its not an instability issue?? You need to try a slugged lead first to remove this suggestion from the equation. Borrow one from your dealer as a test.

Also I hardly think 22/27 ohm resistors in series is going to affect the level much and anyway, just tweaking the relavant speaker levels via the AV2 is not really a hardship...

with regards the meridian is he going to to room correction

neil

I'll call some London Naim dealers and see if any of them have a slugged Din-Canon lead I can borrow. Apologies if I'm a bit rant-ish I appreciate this isn't a problem that is widespread amongst units I'm just a bit miffed as I said of spending a lot of money and having such a problem although I do appreciate the support!

To Neil W - I don't know about the room correction to be honest just going to have a good play around with the unit and see what it can do, he never stops going on about the damn thing so I want to see what all the fuss is about especially given my current situation with the AV2.

Thanks
Dan

Hi Dan,

spoken with your dealer today. One way or another you should have a solution shortly

Hi Dan, any luck yet?

its on e-bay

Afternoon, well I tried the Meridian and it was fine as regards the problems discussed here then, over to my friends house with all my Naim kit and I could not replicate the AV2 problem, the AV2 was working as expected in his house, no hiss etc to be heard at all (other than the normal preamp noise) Good news, - sort of!

I got the slugged cable this morning so will try it this evening to see if that helps.

It's obviously something about my flat that the AV2 dislikes (The Meridian didn't seem to care but that's neither here nor there) These things happen I guess. Unfortunately there happening to me! I'll try the slugged cable this evening to see whether that alleviates my problem and if not then just hope the AV2 sells on.

It's good to know kind of what's causing the problem ie. my flat and not a fault with the unit (If it is a fault it's one that remedies itself with a trip to Chiswick and then re-occurs on the way back to Fulham!)

See what tonight brings with the slugged cable...

Dan

quote:

Originally posted by dan scott:
I'll try the slugged cable this evening to see whether that alleviates my problem and if not then just hope the AV2 sells on.

Dan

If it carries on doing it with the slugged cable I suggest having the unit checked out at naim before you decide to sell...