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Passive sub trick
Some of the 7.1 home theater systems support a "Zone 2" mode. That's
where 2 of the 7 amplifier channels are switched from rear surround sound output to stand-alone analog amplifiers. The remaining system then behaves as a standard 5.1 configuration. That's the key to driving a home-made passive subwoofer or infrasonic woofer. Put a 7.1 receiver into Zone 2 mode. Connect the subwoofer preamp output to a Y-adaptor and then to the Zone 2 inputs. Connect a dual voice coil sub to the Zone 2 speaker terminals. Set the Zone 2 volume to maximum. Now your 5.1 system has a powered subwoofer with an electronic crossover. It's cheaper and simpler than dedicating a component amplifier to a sub and it's way easier than trying to tune a passive crossover to match existing speakers. Fancy 7.1 systems have a per-channel EQ that's really sweet for matching the sub, fronts, center, and rears. |
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