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Surround-sound subwoofer (part 2)

Surround-sound subwoofer (part 2)
This active version of the subwoofer described in last month's instalment is a plus for virtually any hi-fi system. Where the low cut-off frequency of the passive version is around 40 Hz, it is down to about 20 Hz in the active subwoofer. With its integral 240 W amplifier, it is the answer for those seeking a realistic bass foundation for their system. The more so, since its building cost is very reasonable.
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