Awful sound when I turn hd channels on. Please help!

Posted by: tonaimbutafew on 03 May 2012

I have my tv through my supernait via a digital cable into aux1out. When I watch tv it sounds great but put it on a hd Channel it makes a really intense nasty an loud sound. It's set up to PCM as some one said ages ago when I first set it up ages ago. Also I can listen to the tv through av out even though the Bluray player is set to that. Please help as its baffling me.

Thanks

Clare
Posted on: 03 May 2012 by james n

Sounds like its outputting surround on the HD channels hence causing the white noise. Check you have the Downmix to PCM set correctly.

Posted on: 03 May 2012 by tonaimbutafew
Hello James thanks for your speedy reply. What do you mean by down mix. I have a Panasonic tv how would I check my PCM down mix. I set it up to PCM ages ago as got the same sound when I first installed it an since then it's been great it's just on hd channels. Thanks Clare
Posted on: 03 May 2012 by james n

Hi Claire - just check that it's set to always output stereo 2.0 (the PCM setting should have done this) via the digital output.

Posted on: 03 May 2012 by rjstaines

Hi Clare, James is right... what you describe is what multi-channel sound sounds like when fed into a Naim 2-channel amp.

 

It can be reproduced by downloading fthe multi-channel test options from i-Trax and trying to play them !! (although only a sad person like me would be doing this, I guess).

 

Go hunting for the 'force 2-channel output' setting.

 

Roger 

Posted on: 03 May 2012 by tonaimbutafew
I will have to muck around with it again an let you know what the menu options say. Thanks Clare
Posted on: 04 May 2012 by james n

I dont know your TV but i'd look under Audio settings. You should find something that lets you set the digital output as multichannel or stereo. Set it to Stereo and it should always produce a stereo 2.0 output that the Supernait can decode.

 

James

Posted on: 05 May 2012 by tonaimbutafew
Problem solved thanks for all your help The annoying sound has gone woo hoo. Clare
Posted on: 06 May 2012 by tonaimbutafew
Doh it's still doing it. The sound is there but has someone telling blind people what's happening. I've tried everything an cant find how to get rid grrrrrr Clare
Posted on: 06 May 2012 by Mike-B

The SN is not happy with some of the "iffy" audio formats coming from AV.

 

I have Sony TV, BRP & PVR/HD box & played long & hard to get the bad SN sound problem fixed.

I've ended up with an optical feed from the TV to SN for best results. 

 

When from TV - as in TV providing the signal processing - with TV set for 2 channel stereo the sound is perfect.  Its the same when signal is from Sony BRP 

But when the PVR is providing the signal as with HDTV & most of the time, its liable to periodic hiss & momentary off/on's.  

When it goes into a hissing fit I move the input button from AV to something else for a few seconds, then its OK.  The last F1 race on HD needed one such move & was then OK all the way thru, the 2x linked progs on Fleetwood Mac & Peter Green on BBC4 last Friday nite was good all thru the 2.5 hours.   

I've played every setting combo with the PVR,  not that there is much to choose from. 

It does not have any way to positively set or force 2 channel,  but reading the blurb I just guess Dolby Off cuts the 5.1 audio to something like 2-ch.

 

I've been in touch with Sony who claim not guilty.  

My guess its the SN as its a bit picky on the purity of the PCM input

Posted on: 06 May 2012 by tonaimbutafew
My tv is the Panasonic tx-p42v10b if anyone can shed some light on this. Many thanks Clare
Posted on: 14 May 2012 by yeti42

Not quite the same thing as I don't have an accessible DAC so analog feed into a 282.

I've just had a Tivo box installed in place of the old NTL box, so first experience of HDTV (Panasonic tx-p42st, audio set to music) taking the 2 channel audio out from the telly. Watching the young musician of the year last night I started out on HD but the sound was overblown and unnatural, the orchestra sounded particularly disjointed, switching to BBC2 the sound was much better. I've yet to investigate the Tivo settings but I wonder if the BBC are trying to make HD sound impressive for drama and films but getting it wrong for music.