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PSB Alpha VS21 VisionSound Soundbase and SubSeries 150 Subwoofer Review Test Bench
Test Bench

ALPHA VS21 (purple) +2.00/–1.72 dB, 200 Hz to 10 kHz; –3 dB @ 60 Hz, –6 dB @54 Hz with Sub Out control switched off.
SUBSERIES 150 (blue) Close-miked response, normalized to the level at80Hz:lower–3dB@31Hz,–6dB@29Hz,upper–3dB@196Hz with Crossover control set to maximum.—MJP
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