soundstream reference 300 bass early roll off

if you check the schematic you will see that the input gain is part of the input low pass filter.
reducing the gain causes the -3db frequency to go up.
replacing the cap with a bigger doesn't do any harm since it's there to block dc.
the other shematics of the newer models have solve this puting the gain after the opamp.
since i have confirmed it maybe i will not modify it.
it.s really high quality amp and is a waste for a use like this use.
i will see what else i have in stock.