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I have an NAD pre/pro and an NAD seven channel power amp, both their current models and each less than six months old. Recently the system developed a hum in the left front speaker. After checking all connections and swapping out the pre/pro to amp cable, I fixed the hum by using a cheater plug on the power amp at the surge protector.But then I noticed that the front presentation, whether in stereo or multi-channel, was shifted to the right. I again checked all connections and also checked for proper phase. Everyhting checked. Using the circulating test tone I made all channels the same level using a sound level meter. But whn i swirched back to cintinuous music or movies, the sound was still shifted to the right of cewnter. I switched the center channel speker in and out of the system and there was still the right shift in either mode.
The only way I can center things is to add 4 db to the left front channel and subtract 4 db from the right front channel. 8 db is a lot of difference and I am mystified since test tones now are clearly louder in the left front channel.
Does anyone have any idea what is going on?
Follow Ups:
Switch left and right channels, then ICs, so you know if it is a problem with the power or the ICs, or elsewhere...Good luck...
Antonio Melo Ribeiro
Just to confirm...did you clean all the connections? Did you change anything in the system or did the hum just "appear."
The hum just appeared and over a few days got to a bothersome level. I did not clean any coonections but did swap out the pre to power amp cable to make sure that it wasn't the culprit.
I know that it can be a pain, but I would suggest taking EVERYTHING apart & cleaning all the cables and connectors. CAIG makes some good cleaners that are effective. My experience is that over time connections get dirty and/or loose. Cleaning and carefully rearranging all the wires often solves this type of problem.
Does it do it on all sources going into the NAD? I would think if the receiver generated test tones at the correct balance, maybe you have a problem with your DVD player or interconnects?
All sources are affected. Thanks.
Are you using the built-in test tones or those from a calibration CD? If the latter, do they agree with the built-in ones?Kal
I will try that and report back. Thanks, rico
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