“Answers as to whether AVR-S540BT's subwoofer pre-amp output will drive a passive subwoofer have been inconsistent . I have a Sony SS-WS74 passive subwoofer, never used at full volume/potential. Will this work? And not impact AVR-S540BT reliability?”
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A passive subwoofer needs an external power source. This receiver only has the signal output (RCA), not power for the speaker. A subwoofer (sub) is a speaker, that is dedicated to the reproduction of low-pitched audio frequencies most commonly referred to as bass. Passive Sub: Passive subs are called passive because they need to be powered by an external amplifier or Audio/Video (A/V) receiver . This is similar to traditional speakers. The important thing to remember about a passive sub is that since the sub needs more power to reproduce low frequency sounds, the amplifier or A/V receiver needs to be able to send enough power to sustain bass effects reproduced by the sub without draining the power supply in the A/V receiver or amplifier. Active or Powered Sub: This type of sub is a self-contained speaker and amplifier. The speaker and amplifier are matched to for optimal performance and both are housed in the same enclosure. This takes a lot of the power load away from the A/V receiver and allows the receiver or amplifiers to just power the mid-range and tweeter speakers.
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