problem ... pls help.

[learner]

i just install my amp to the factory unit, it able to turn on... but the thing is there is NO BASS at all... the sound is like high pass filtered.

P.S. before i have this amp in my old car... it was ok. but now.....
the only different when i install this in my old car is
1) i use high level input rather then line input in the old car.
2) was a sony headunit before, but now using the factory unit.

pls help.......... :(

[ECU-MAN]

check your xover filter levels on the amp, make sure they work for both inputs, turn up the Bass on the deck.

[micka]

also check the phase of the speakers, could be some cancellation issues. fade left and right, if there's bass when faded to one side and gone when centered then one is wired incorrectly