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Re: DC at output: Why is it bad, and how to check?

Another opinion is that there may be DC at the output. Can someone tell me why that is bad, and how to check?

Technically it's bad because DC offset at your amplifier's output produces an offset in any loudspeaker drivers which are DC coupled (which is typically only the woofer in most systems). In other words, the cone becomes offset from it's normal point of equilibrium causing the cone's motion to become non-linear much sooner in the direction of the offset. In other other words, you reduce the amount of linear travel in that direction. The result is increased distortion.

You can measure the DC offset of the amplifier simply by measuring the DC voltage across the the amplifier's output terminals with no signal present. Checking DC offset due to the tuner may be a bit more difficult because of the presence of signal and noise. You won't be able to get an accurate reading with just a simple meter. You'd need to use an AC meter which is capable of giving you the DC component of an AC signal.

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