CD output L/R channels uneven

[nad]

Hello,

My NAD C515BEE CD player seems to be outputting a slightly uneven left/right sound.

There seems to be plenty of punchy bass from the right but it's missing some high notes, where as the left channel seems to be missing some punch but has more top.

It's definately not the cables/speakers/positioning/amp as I've swapped, checked and checked again.

Anyone help me???

 

[UV101]

probably a silly question, but is it the same on different cds?

Some recordings can give you these symptoms!

 

[nad]

Thanks, never thought it might be the cd. I'll try a variety tonight.

I'm going to make a test cd in duplicated stereo comprising of 20 second tracks of numerous frequencies ranging from around 40hz to 20khz in steps. That should let me know if each channel is producing the equal output. And if not, at least it'll tell me at what frequency there is a problem.

 

[kevinkr]

Watch out at frequencies beyond 5kHz or so that you do not damage your tweeters, they tend not to like high amplitude single tones which can quickly destroy the voice coil due to overheating. (In some cases just a few watts for a couple of minutes or less is enough to do it.)

Frankly anything above a few kHz is likely unnecessary for this test. This isn't the way I would do it unless I had no test equipment at my disposal.

 

[Mooly]

If you have a DVM that reads reasonably accurately over the audio band (not all do) use that on AC volts to check the line outputs from the player with a test CD.
You can do the same test then across each speaker output but don't go over 2 or 3 volts rms.

 

[wwenze]

If you have a DVM that reads reasonably accurately over the audio band (not all do) use that on AC volts to check the line outputs from the player with a test CD.
You can do the same test then across each speaker output but don't go over 2 or 3 volts rms.

...or you can create a 50Hz test clip.