What is the best way to hook up a subwoofer to my existing 2 channel system without degrading the sound quality to the speaker and sub? My Int. Amp. doesn't have a LFE/sub output but it has a Pre-out1 & pre-out2(volume cotrol by the amp). But both 10" sub I'm looking for from HSU and SVS only comes with LFE input and a speaker level input. I'm afraid using the speaker level input as it'll degraded the sound quality to my speaker as I have to use the sub to further distribute the signal to speaker. Any suggestions?