You should use the subwoofer line out (aka "low frequency effects" (LFE) output). Two reasons: 1. It has a built-in amp. 2. If you wire it to the main speakers it won't receive the seperate subwoofer soundtrack, nor will it receive the low frequencies from the center or rear speakers.Unless the receiver is set up this way by default and you aren't given the option to change it, make sure the speaker settings on the receiver are set to "small". Then, check to see if you have a subwoofer setting on the receiver with options like: sub only, main only, both. You will want to pick "both." This will send the low frequencies from all of the other speakers to your subwoofer, as well as any unique subwoofer (LFE) effects included in the audio track.Wiring the subwoofer to the main speakers worked back in the days of dolby prologic because the signals sent to the center and rear speakers were based on the same stereo signal sent to the main front speakers. Dolby Digital/DTS sends a separate signal to each of the 6 speakers. So, if you wire your sub to only the mains you will be missing the bass from the center, the two surround speakers, and the subwoofer's own LFE signal.If you want to verify the proper operation of your subwoofer you can purchase the AVIA Guide to Home Theater DVD. It contains a few frequency sweeps (hi to low) to test the point at which your subwoofer kicks in.marxtacy
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