Well, Speaker level is a higher voltage signal then line level, Line level is what the head unit puts out to external amps, Its a lower BUT CLEANER SIGNAL and can run longer distances without signal loss (with a shielded wire) but is more prone to interfearance from power wires crossing over the wire (why you should use shielded wires), the output from the amp is speaker level, its alot stronger of a signal, but is prone to signal loss b/c resistance in the wire, but b/c its a stronger signal is not prone to external Interfearance.
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One more thing since I'm saying alot here. Is this speaker level to line level converter something like this:
Parts Express:Audioplex SPKCNV Speaker Level To Line Level Converter
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Thats kinda what i was talking about, the one I used to use was from Radio shack and only cost like $20 and was made for car audio, It had 4 wires commeing out of one end (the speaker level input) and 2 sets os RCA's comming out of the live level output side.
Scosche SLC4 Four-channel line output converter at Crutchfield.com