Humming noise

Posted by: GeraldUK on 15 December 2008

Hi
Im using a 145 for my centre channel and can hear a humming noise. I've even moved the amp into a space away from the rest of the naim kit and still it some noise. is this normal ? its not so loud so when a movie on i can hear it but i can when not. A little annoying ! appreciate any advice

Posted on: 16 December 2008 by joe90

Ask your dealer to come and help out if they can.

Posted on: 17 December 2008 by GeraldUK

its the box itself. None of my other boxes humm like it , guess i need to bring it into a dealer and have it looked at. Unit is not that old or been used much either

Posted on: 17 December 2008 by John M

how is the signal for the center channel getting to the 145? You may have a grounding problem. I had a similar problem (possibly) when I used the pre-outs on my home theater amp going to my nait5 for the r/l channel. I used what in the US is called a "ground loop isolator" on the i/c between the two amps and it sorted itself right away.

Posted on: 18 December 2008 by GeraldUK

its actually humming when only plugged into the mains and with no speaker or cable to AV2.

Posted on: 18 December 2008 by Adam Meredith

quote:
Originally posted by GeraldUK:
it's the box itself. ..

This will occasionally occur - often a specific interaction of a transformer and a local mains supply.

We test all transformers under artificial noise conditions and reject those that fail. However, under some circumstances some transformers will hum. See below.

Posted on: 29 December 2008 by GeraldUK

thanks for the advice , even u munch ! will have a tinker and if it still annoying back to the dealer i will go