If you have pre-amp, just set the Bass and Trebel to 0 i.e flat sound..

Control the tone through pre-amp or HU...

As for gain, set AS LOW AS POSSIBLE, but not 0 as it will give -ve gain, which is SOFTER than original sound...

Other reason to set it as low is to avoid your amp overheating....

If you have pre-amp, just set the Bass and Trebel to 0 i.e flat sound..

Control the tone through pre-amp or HU...

As for gain, set AS LOW AS POSSIBLE, but not 0 as it will give -ve gain, which is SOFTER than original sound...

Other reason to set it as low is to avoid your amp overheating....

yupe... setting the amp to high gain might get you louder volume (good for SPL competition) but at the cost of loosing SQ and over heat very fast...

as i told u
ALL AMP WILL OVERHEAT
this is a known fact
but dun get misunderstand it will overheat by itself even u set it to zero gain
playing with gain settings is very important

and gain settings is very much depends amp output and input
an amp accepts 4v input will not need much gain if the HU is 4v out or above

if u're using like normal HU pioneer 2/3/4/5 series, 2004 modls of kenwood
which has oni 2.x v
then u will need to set the gain

if a gain is set correctly
no matter how long u play it ...there wont be heating problem
(but dun la play until 24 hours continuously)

I just like to confirm this ...

If set gain correctly (usually less than 50% max volume) IT WILL NOT OVERHEAT when played at long hours..

If the gain is set high >70%, it take less than 1 hr for the amp to overheat...

Usually when overheat, the amp will cut power to the block, if a bit severe, it will burn the fuse, and in extreme cases it will destroy the amp completely...

This apply to all classes of amp....