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I have an active sub thats running on the sub channel on my decoder, but if you dont have a sub channel you can put the front L+R through it and it strips off the low frequency stuff using an adjustable cross over. Some people use his system to make 6.2 or 7.2, they add a sub to the rear as well as having one on the sub channel, or at least I think thast how it works. On a dolby 5.1 setup there is an indevidual channel for the sub, you wouldnt get this if its running off the fronts.
Cheers
Jon
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