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General Features

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A phase switch adjusts the timing of your powered subwoofer very slightly in order to help its woofer and the woofers in your main speakers move in and out at the same time (or "in phase"). Depending on its placement in your room, your sub may sound better with the switch engaged, or not.
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Speaker-level inputs let you hook up your powered sub by using the speaker connections from your receiver or amp, eliminating the need to run a separate RCA patch cable.
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If you're using speaker-level connections to hook up your powered subwoofer, speaker-level outputs let you easily send amplified signals on to your main speakers.

Woofer Size (inches) More Information
The diameter of the woofer.

Firing Direction More Information
Some computer speakers feature a separate subwoofer for bigger, more powerful bass.

Amplifier Power (RMS) More Information
The subwoofer amplifier's continuous (RMS) output in watts. The greater the RMS output, the cleaner and louder the sub will play.

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Powered Subwoofers

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A Review of the THIEL CS3.7 LoudspeakerThe CS3.7 replaces THIEL's model CS3.6, one of the most highly regarded audiophile speakers of the past 15 years. Jim Thiel considers this new model to be the best speaker THIEL has ever made.

Bass Basics: Connecting and Tuning Your Home Theater SubwooferJim Ralston outlines some tips on how to adjust your subwoofer for better home theater performance.