Lfe Input: Found on some powered subwoofers, this special preamp-level input accepts the 'Low Frequency Effects' signal that's output by digital 5.1-, 6.1-, or 7.1-channel home theater receivers, ensuring proper bass reproduction. This type of input doesn't route the signal through any processing inside the sub which could potentially interfere with the low-pass crossover built into the receiver's bass management circuitry. Some powered subs feature an unfiltered LFE input/output — the output sends full-range signals minus the low frequencies back to a receiver or preamplifier's 'main in' jacks for even more precise sonic control.

 

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