is it normal for Tuner to break through on the cd input

Posted by: justin65 on 27 June 2018

Hello,

When I press the cd input on my naim Nait XS and I still have the Pure Tuner on I can hear the Tuner sound coming through the Cd player input . its a lot quieter but its definately breaking through. Is this normal for sound to break through on another input. I thought these inputs were totally isolated. I know the easy solution is just to make sure the Tuner is off while playing CDs. if its normal just wondering if more expensive amps are all the same.

Posted on: 27 June 2018 by Christopher_M

Hi, No, it's not normal. Nor would it be normal on a more expensive amp either. Does the tuner still break through if it's on the AUX1 or AV input, for instance?

Posted on: 27 June 2018 by justin65

Hello,

yes its coming through on aux 1 aux 2 and AV inputs too.

Posted on: 27 June 2018 by Christopher_M

Not sure if this makes any difference but are you using DIN or RCA inputs on your NAIT XS?

Posted on: 27 June 2018 by Richard Dane

Well, it does depend on just how high you turn up the volume knob.  For sure, at normal CD listening levels there should be absolutely no appreciable break through from any other input.  However, if you turn up the volume level to a very high level indeed on an unused input (way beyond even the highest comfortable listening level) then you should just about hear a rather tinny low level signal from another input.  That's normal.  At normal listening levels any other input is at such a low level that it's inconsequential.

However, are you saying that when you play a CD, then the tuner signal interferes and blends with what you hear from the CD?  If so, then that doesn't sound normal.

Posted on: 27 June 2018 by justin65

Thanks Richard, I just changed my chord signature to naim grey interconnect and there is absolutely no sound of the tuner coming through on the cd input. The chord interconnect has got to be faulty because I also get a low level hum on the cd input with it also. I guesss that confirms the fact that the chord is not screened. I checked the the earths and they are ok but i cant check if the overall screen is connected. I will send it back

Posted on: 27 June 2018 by ChrisR_EPL

I used to get this if I mixed RCA and DIN Leads. Can't remember the permutation but it was clearly wrong when I looked. Offered as a suggestion only.

Posted on: 28 June 2018 by Japtimscarlet

I also used to get that on my amstrad 5050 tuneramp back in 1976 ....it was annoying then and I was mostly too spaced to care about anything much ...

Posted on: 28 June 2018 by Richard Dane
ChrisR_EPL posted:

I used to get this if I mixed RCA and DIN Leads. Can't remember the permutation but it was clearly wrong when I looked. Offered as a suggestion only.

Chris, that may have been on one of the units with paralleled RCA phono & DIN inputs.  One these only one or the other was to be used not both on the same input, otherwise...

Posted on: 28 June 2018 by benjy

On my nac 202 if i turn the volume way up with no other signal playing, then yes I can hear the tuner even if switched to cd input. I don't think it is enough to cause an audible difference when cd is in use but since i do leave even the tuner on,I "tune" to the end of the spectrum - no channel and then the only "noise" it can add is some hiss - definitely not noticeable when a cd is playing!

Posted on: 28 June 2018 by Mike-B

Like Benjy I can find a way to get a low level tuner noise to be heard on CD input with my Supernait.  To do this I just have the tuner playing,  switch input to CD & turn up the volume & it can be heard, just, its very low but its there.   Is it a problem? - NO.     First the volume has to be ridiculously high to hear it,   however the CD input is dead, it has nothing on that circuit & because of that it can sense the tuner signal (noise) from the nearby tuner circuit PCB track.  When the CD input is live,  & even when playing nothing,  any cross track noise is totally nulled

Posted on: 28 June 2018 by ChrisR_EPL
Richard Dane posted:
ChrisR_EPL posted:

I used to get this if I mixed RCA and DIN Leads. Can't remember the permutation but it was clearly wrong when I looked. Offered as a suggestion only.

Chris, that may have been on one of the units with paralleled RCA phono & DIN inputs.  One these only one or the other was to be used not both on the same input, otherwise...

I know, it came about when I'd been doing some fishing around blindly trying to reach round the back to reconnect it all after a move. Not an actual problem tbh, at least I didn't manage to force the mains lead into the speaker outs.

Posted on: 28 June 2018 by Mike-B
ChrisR_EPL posted:
Richard Dane posted:
ChrisR_EPL posted:

I used to get this if I mixed RCA and DIN Leads. Can't remember the permutation but it was clearly wrong when I looked. Offered as a suggestion only.

Chris, that may have been on one of the units with paralleled RCA phono & DIN inputs.  One these only one or the other was to be used not both on the same input, otherwise...

I know, it came about when I'd been doing some fishing around blindly trying to reach round the back to reconnect it all after a move. Not an actual problem tbh, at least I didn't manage to force the mains lead into the speaker outs.

To break thru possible confusion with these posts,  I can get the cross track/channel break thru using only DIN-DIN on all inputs.  Its simply cross channel noise, most likely between PCB tracks