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In Reply to: AV Receivers - Question about power and crossovers posted by Uncle Pete on June 22, 2003 at 09:16:15:
>if I get a decent powered subwoofer and plug it into the HK, will
>this automatically direct all bass to the subwoofer and not to the
>Front L&R (where it's going now) thereby allowing the Front L&R to
>perform better?many (perhaps even most) good subs will allow you to dump a signal into the sub which will then filter out the low end and send that off to the main speakers. i just checked the one i am looking into buying, which is the titanic from parts express (ddesigned by vance dickason blah blah blah) and it has that feature.
i've also heard that there are inline filters you can buy which will dump certain freqencies from the mains and allow you to plug in directly. those are another option.
as for whether it will sound better, a lot of people debate this. many choose to run their mains full range with the sub and say they prefer this. others think that dropping the sub frequencies from the mains sounds better... you may want to try both ways before you make a decision.
>if I have a seperate power amp running the center channel (or the
>Front L&R's) will this "free up" the power that was used for
>that/those channel(s) to be ditributed to the remaining channels?probably not... amps have individual power amps per channel and they're not going to get more powerful. there may be some kind of issue with the power supply that will allow it to better distribute the power so that things sound cleaner, but i doubt it will affect volume.
Follow Ups:
The truth is,
Crossovers at subwoofer frequencies are not practical. They require huge coils and large electrolytic capacitors. Electrolytic capacitors on the path of the speakers, by the way, is degrading.So,
Any subwoofer boasting a hi-pass filtered outlet to the main speakers is highly deceptive. It actually has nothing more than a pair of electrolytic capacitors inside. A capacitor alone produces a first order 6 db/octave filter which is almost useless. And it will degrade the signal quality of the main speakers.Don't buy a subwoofer because it has filtered main speaker outlets.
If the sub you buy has such a feature, don't use it. Leave the crossing-over business to the much more competent active circuits inside the AV receiver.
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