low level = line level

I think the previous post was just saying that there is only one line level input, so if you are using a stereo receiver (rather than AVR) and don't have a "subwoofer out" then you need to find another way to blend the two channels.

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8