Question about NAD C350 2-Channel Amplifier

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Gem Sound XP-350 both channels failed

Neither of the channels on this amp work. every connection inside seems to be intact. i've tried this with every volume level and bridged and stereo settings. it shuts itself off after both channel volumes exceed 40%, though no sound is coming from these channels. sound is still produced when the speaker jack is removed though. what can I do to try to isolate the source of this problem? the fuses in the amp all look good...

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Re: Gem Sound XP-350 both channels failed

Speaker fuses are generally fast-blow styles 250 volt glass
If an amp shuts down, with speakers connected, it sounds like one of the power supply lines does NOT like what it's "seeing" . Probably output transistors bad ( or module)

Take it to a tech.

Scott out.

Posted on Jan 08, 2008

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Gem sound xp-350 clipping

Hi There,

You have given me a good clue to your problem....

You say that the CD player goes well and does not shut the system down like the Live connections. This is a single input configuration...

This means that there is sound levels coming in from the live multiple connections that are too strong (Loud) for the amp to handle...
Its a good amp you have as its shutting down to protect itself instead of blowing up....
So.... set up for the live show then disconnect all but one of the live inputs and start the live session if its OK, then connect another of the live connections, and see if its OK, if it is then connect another live one connecting each one progressively until the problem occurs again...this last live connection is the one that is too loud in signal strength for the amp to handle causing the shut down...

Solution is to reduce tha signal on that last cable source to a level that stops the shut down...I remember that groups of guitar players have volume controls on each guitar and if these are set too high then this can occur....specially if they are all using the same amp without a controlled "mixer man" monitoring each input signal.
Rember the small meters on the mixing panel which have a green painted area and a red painted area the "mixer man" must keep the each meter needle in the green zone for all the inputs otherwise a shut down occurs.
Hope this helps you...

Cheers From

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