How does sub-outlet work?

Video Asylum

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OK, I'm a newbie to all this surround stuff. I have a couple of questions.
A surround amp has a sub-woofer outlet, yes? Made to send a (mono)line signal to an active sub (build-in amp). The THX cross-over frequency between mains & sub is 80Hz(?)
My question: Is this crossover frequency build-in to the surround amp, so in the prober 'mode', it will direct the relevant frequencies to the ditto speakers - in other words, does the surround amp have an active cross-over network? & if so, what slopes (12, 18 or other dB/oct) does it work with?
The thing is, if one wanted to build a budget surround system, this would make it possible to use for instance an older 'surplus' amp in connection with a DIY sub. A bandpass sub could be made to go deep enough without the need for the compensation & crossover-networks that are usual features of plate-amps, made for sub-woofer duty. Yes, I'm cheap...
Suplementary question: Is the filter (if there is one) also usable in stereo-mode? So the sub could be used in normal music listening, too?
Thx in advance for any answers.

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Kimber Kable

Topic - How does sub-outlet work? - mollecon 17:05:31 07/27/03 (1)

Re: How does sub-outlet work? - Lowrider 03:43:18 07/28/03 (0)

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