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Crutchfield recommends Kenwood's new 4-channel amps featuring variable high-pass and low-pass crossovers (50-200 Hz), front and rear. Crutchfield notes, "You'll get the best possible sound from your system by sending just the right frequencies to each speaker. And you'll have multiple hookup options. Drive two pair of stereo speakers, or bridge the two rear channels to power your subwoofer, and use the two front channels for your main stereo pair.