Tuning an amp: read the instruction manual carefully first. Typically the low pass filter will filter out any frequencies higher than what you set it too. The high pass filter will remove any frequencies lower than it's setting. To get the cleanest possible sound
from the system, oversize the amps and turn the levels back down to correspond with the speakers. This is referred to as 'overhead'. Generally, the less an amplifier
has to work, the better it will sound.
For more info on amplifier wiring see: How To: wire an amp