JBL S120P II ($799) Its large driver and 400-watt amp suggest that the S120P II can rumble with the best of them.

What's in the Box? • Cabinet design ported • Finish black maple • Driver size 12 inches • Rated Power 400 watts • Controls variable 50- to 150-Hz low-pass crossover, level, phase switch, auto-on • Warranty 5 years

How Big Is It? • Dimensions (WxHxD) 16 1/4 x 16 x 19 7/8 inches • Volume 3 1/8 cubic feet • Footprint 2 1/4 square feet • Weight 56 pounds

Ins & Outs • line- and speaker-level inputs • speaker-level output • input and output for future bass-equalization feature

How Low Does It Go? • Bass limit 25 Hz at 86 dB SPL The JBL produced deep, robust bass without breaking a sweat.

How Big the Bang? • Average SPL from 25 to 62 Hz 104.4 dB • Maximum SPL 111 dB at 62 Hz • Dollars per dB $7.65 The sub's strong output was evenly distributed over its frequency range.

The Bottom Line Strong output capability (107+ dB SPL) at all frequencies above 25 Hz, tight, powerful, and smooth low bass, a great warranty, and a reasonable price make this moderately large subwoofer a real value. Its high-tech styling is appealing, too.

Manufacturer JBL Consumer Products, www.jbl.com, 516-496-3400