well bridge the subs so that they are running off two channels each, You use the positive from one channel and the negative from the next channel so you double the power to them. Your amp MUST be bridgable though, it will say on the side or near the speaker connections
yea my amp is bridgable. i bridged them now but i still have a lot more treble than i would like. Any more suggestions?
Do you have a crossover on the amplifier? Your subs should not be reproducing mid/high frequencies. If so, turn the crossover onto to low-pass, if not, you will need a crossover. Also, check to make sure your subs are not wired out of phase, which means that both are hooked up positive to positive, negative to negative.
my subs are wired alright and everything but no i dont have a crossover. Isn't there a converter or sumthin to get a lot more bass?
Giving a sub high frequencies can ruin the sub, since the subs can't move at that high of a frequency. That means any high frequency signal applied to the sub will be converted to heat instead of movement. It also wastes amplifier power that could have been used to make bass.