Polk PSW-300 (c. 1996–1997)
The PSW-300 was Polk's powered subwoofer from the mid-1990s, often written "PSW300." Documentation is thin. The period record is mostly one substantial Audio review and a Polk advertisement, and neither tells the whole story.
In Audio (April 1997, p.53), D.B. Keele, Jr. ran the PSW-300 as part of a Polk home theater system alongside the RT7 mains, CS350 center, and LSf/x surrounds. He drove the sub's line-level inputs from a preamp and routed through its high-pass outputs to the main speakers. He found the sub clean in the low bass. It reached 32 Hz solidly and still produced usable output at 25 Hz. The high-pass outputs made it an integrated part of a surround setup, not a low-frequency add-on.
Polk's own advertising in Audio (October 1996, p.227) pushed the proprietary technologies behind it. The ad claimed the PSW-300's "Power Port" and "High Velocity Compression Drive" designs were patented and exclusive. Those names suggest Polk was taking the vented-box approach seriously at the time. No definitive amplifier rating, driver size, or cabinet dimension has survived in the available sources.
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