Help! Dummy confused! (Bass management)

Video Asylum

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I'm trying to advise a person of a modest 2-channel theater and am totally unsure how the bass management in a 'typical' surround receiver works. (I think we're looking at an older Marantz 4000 series).
I was advising just to have him grab a decent stereo receiver, but he's likely going with smaller fronts that go down to app 70 hz. So high-pass filtering seemed pretty essential. I've always assumed that the 80 hz LFE crossover is a high-pass filter for the 'small' speaker setting to help save the little speakers' lives, but now I'm wondering. One SVS sub I'm looking at has no low-pass crossover, I assume because they figure an AV receiver does that. An NHT sub I'm looking at mentions that using the LFE inputs defeats the sub's low-pass crossover and uses the receiver's crossover electronics.
So, is the typical 80-90 hz crossover a high-pass filter or a low-pass filter? Or do AV receivers typically do both jobs? Thanks!

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Topic - Help! Dummy confused! (Bass management) - Teejay 11:36:38 03/04/06 (1)

Run speaker wire to sub, then back to speakers - Dalancroft 00:12:21 03/05/06 (0)

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