The Yamaha YST-SW012 is a small subwoofer, but it boasts an unusually deep frequency range for a speaker of its size. Subwoofers this size – it has an 8-inch driver – usually don't get down to 28Hz, which is what the Yamaha is rated to achieve. This is one of the most accurate subwoofers we reviewed, according to our subwoofer frequency testing. The subwoofer displayed a flat line across our grid indicating accurate reproduction of the 20Hz to 200Hz sine wave we used to test the sub. When a speaker reproduces tones accurately, it generally makes for a pleasant and natural sound quality – and that was the case in our listening tests. Our listening panel often described the YST-SW012 subwoofer speaker as warm and natural sounding during our testing, and every one of our panelists could feel the bass rumble under their feet – an impressive feat for an 8-inch home subwoofer.