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From: gvcormack@watmum.UUCP (Gordon V. Cormack)
Newsgroups: net.audio
Subject: Re: Cross-over networks for sub-woofers?
Message-ID: <287@watmum.UUCP>
Date: Mon, 14-Oct-85 17:08:33 EDT
Article-I.D.: watmum.287
Posted: Mon Oct 14 17:08:33 1985
Date-Received: Tue, 15-Oct-85 10:02:16 EDT
References: <1203@ihuxn.UUCP>
Distribution: net
Organization: U of Waterloo, Ontario
Lines: 10

> I would like to build a sub-woofer for my stereo system.  I know how
> to make crossover networks for regular speakers, but I can`t figure
> out how to make one work for a sub-woofer.  The catch is that I want
> bass from both right and left channels to driver the sub-woofer. 

The easiest way is to put two drivers in the same box.  Connect one
channel to each driver.  Alternatively, buy a separate amplifier for
the sub-woofer.  Then implement a low-power filter and mixer.        
There is no efficient, passive way to mix the two channels together
electrically.