UGS-DC offset

Hi,
is the Power amp DC coupled?
What is the DC gain?
Multiply that gain by the worst case output offset of the pre-amp.
Is that output offset acceptable?

You have a number of solutions, I don't think you can do nothing.

a.) Insert a DC blocking cap at the power amp input, so that external offsets can't pass through.
b.) Insert a DC blocking cap in the Power amp feedback circuit to reduce DC gain to 1.
c.) Add a DC servo to the pre-amp.
d.) Add a DC detect to activate an input mute on the Power amp input.
e.) Add a DC servo to the Power amplifier.
f.) Add a DC detect to activate a speaker isolation relay/switch.