Amp Tune

[GrandAmGT]

ok... Im running a us acoustics 65x4 amp to mb quart 4'6' and 6'9'

the ppl at the audio shop said dont raise the volume past 45..the HU volume goes up to 62....raising it past 45 can distort....

so im riding along...i turn the volume up to around 30-35 and it isnt even that loud..its kinda loud..but not to where i cant take it anymore...

heres the amp:
:Channel 3/4:
-Lowpass: 16-
-Highpass: 50
-Level aka Gain: like at 25%

:Channel 1/2:
-Highpass: 170
-Level: right in the middle.. 50%

--The Mode buttons arent pushed in..so that means flat/highpass


now how should i tune it..need a few pointers.....any details will help..thanx a bunch

[GrandAmGT]

oops.. lowpass is set at 160