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Energy ESW-V8 8″ Passive Subwoofer, Custom-Modified, Gloss Black
Infinity Minuette MPS Passive Subwoofer – Dual 6.5″, Front-Ported
A passive subwoofer, which means no power cord, no built-in amplifier and no electronic crossover to fail. Two 6.5-inch polypropylene woofers in a bandpass box, 40 to 150Hz, wired high-level — your amplifier's front outputs go in, your main speakers come off the pass-through, and the sub keeps everything below about 150Hz. Twenty-eight pounds of moulded composite. Very good condition.
Bose Acoustimass 10 Series II Bass Module | Black, Passive
Three 5.25-inch dual-voice-coil woofers in a 28-pound passive module — the bass box from the Acoustimass 10 Series II system, sold on its own. Read that literally: it needs the proprietary Bose interconnects and satellites to work at all, and will not connect to a receiver by itself. It is here for owners who have the rest of the system and need the module. Tested before listing.
LG SH96TA-W Passive Subwoofer, Front-Firing, Front-Ported, Black
The passive subwoofer that shipped with LG's SH96TA home-theatre system — forward-firing driver and a front port, so it can back onto a wall or sit inside a cabinet without upsetting the tuning. It is a 3-ohm load and needs a receiver with a dedicated passive-subwoofer output; it should not go on ordinary speaker terminals. No power cord, no plate amp to age out. Good cosmetic condition.