AVS Special Member
Join Date: Nov 2006
Location: Bushnell's Basin, NY
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What mrbean and arny have said is that you have no RCA jack for LFE on this AVR. You do not have the right connections for the AVR to do bass management: set high pass frequency for speakers, low pass for the sub, and integrate all the bass signals into a single LFE channel.
Your only choice is to use the high-level input on the sub, allowing it to do the crossover. This is not the same as 5.1 with an LFE channel as the sub won't alter the signal to the speakers you run through it one bit, and no other speakers are aware there's a sub.
Arny references the Onkyo SR313 which, for the same money, gives you bass management capability on the AVR. Both work, but LFE's better, IMHO.