Question about NAD C370 2-Channel Amplifier

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No base in one speaker - NAD C370 2-Channel Amplifier

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Usually this is because the base driver in your speaker is shot. I have repaired hundreds of amplifiers and have never found just the BASS being low at the output of the amp. If the amp is working, then the likelyhood of the speaker being defective is good. A quick test is to just swap speakers and see if the problem moves to the other channel.

If you have a very old transistorized amplifier, you may have a large value coupling capacitor between the actual amplifier circuitry and the speaker output. This is because the older amps had a large DC voltage at the output of the amplifier and this had to be removed or the speaker would be damaged. This capacitor may have finally given up the ghost and needs replacing. While you are at it, you may as well replace both as the other is soon to go.

My bet is that the woofer in the speaker cabinet has blown.

Posted on Dec 07, 2014


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