I have a NAD amplifier and i noticed the wires from one of the connectors had come loose on the back of the speaker. When i attached it it made a pop and a spark and the speaker just hummed with no sound coming out. I swapped the speakers to test if it was the speaker or the amp and the same problem existed. This is strange as the amp worked perfectly. Maybe one of the kids has knocked it over or something, anyone got any ideas to why this issue has arisen. Also when touching the left speaker wire to the right speaker wire it sparks.
Audio output amp section circuit to your amp [left] has damaged. Check and replace damaged component/s there. The work will is a skilled one. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy Pull up older posts. Surf the site with patience.
http://electronicshelponline.blogspot.com/
SOURCE: nad 302 amplifier
sounds to me that the vol control has lost its earth end connection So yes its a problem with the dial control You couls try some contact cleaner But better still lift of the lid and base if possible while the amplifier is not plugged into the power socket and see if you have a dry joints around the vol control pot regards Trev
SOURCE: Sound through one channel only.....NAD 310 Amplifier
If swapping of left and right input sources and left and right speakers does not help...you might have a bad channel in your amp.
SOURCE: NAD C272 Amplifier: Intermittent left channel
My solution was actually indeed the output protection relay. What I did was to open up the relay and use contact cleaner and a very fine abrasive to clean the contact surfaces of the relay. After that, the problem was gone!
The way to diagnose this for me was to run the amplifier open until the problem recurred and to simply tap the relay's box. The sound came on immediately, and I was convinced.
SOURCE: Muffled/bad sound on 1 channel of Marantz PM4400 amplifier
Go directly to the main amp, follow the leads from the speaker terminals. And you should find something on an heatsink. If there are two transistors see if they are running hotter than the other channel. If you see any damage to them (compare with good channel) replace both!
If all you see is a black box with pins coming out of it you need to replace that. They sometimes have the letters STK on them.
Replace both types with the letters and numbers of the same type. IE 2SC 1220 or STK 589.
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