Subwoofer with advanced YST method The YST method uses Hermholts resonance principle bass regeneration technology that drives the internal woofer unit by negative resistance circuit, removing small amplitudes within the enclosure as a large large amplitude sound pressure from the port. In the advanced YST method, the YST method has changed the negative resistance circuits to a variable type, improving linear at maximum sound pressure.
Add bass to your music and spice to your life with Yamahas YST-SW45 active subwoofer, a compact and affordable way to increase your enjoyment of music, movies, and even computer audio.
With a 70-watt built-in amplifier, line-level inputs, high-quality five-way binding-post speaker inputs and outputs, plus an auto-on standby circuit, volume level, and adjustable crossover (see FAQ for more info), the YST-SW45 is about as flexible as they come. Setup was a snap--we were able to dial in just the right amount of bass and the correct crossover point within minutes. And its manageable size makes the YST-SW45 easy to place; you can tuck it into a corner, next to a sofa, or even under a desk.
Besides being flexible, the YST-SW45 is also a fine performer, thanks to Yamahas long-throw 8-inch woofer and active-servo technology, which tracks the movement of the driver and matches it to the incoming signal, correcting any perceived errors (or distortion). In addition, the front-firing bass port effectively increases the speakers sensitivity and bass output, delivering very good definition with a decent punch and a good sense of low-end body.
But we must take issue with Yamahas frequency-response rating, which is inflated because the stated 30 to 200 Hz performance is measured at -10 dB, rather than the standard -3 dB. In other words, at 30 Hz (or cycles per second)--very deep bass indeed--the YST-SW45 does have measurable output, but its 10 decibels below its average output at, say, 60 Hz. Our test tones indicate that the YST-SW45s -3 dB point is around 42 Hz, which is still quite good, but not subterranean.
Compact, flexible, and well made, with a more-than-respectable if not explosive bass output, Yamahas YST-SW45 is a fine, small active subwoofer. Unless you have a huge room or love bass to rattle your cage, it will nicely fill out the sound of any compact speaker or home theater rig. --Wayne Garcia
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