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M&K Sound X15+ THX Dominus Certified Subwoofer Review Test Bench
Test Bench

Fig.1 Blue trace: The X15+ in the first position tried revealed a deep +7dB dip at 25Hz. Green trace: Position two resulted in much smoother bass response below 40 Hz.—DV

Fig.2 The X15+ in position two (green trace) showed higher measurable output below 17Hz compared with my reference subwoofer array (red trace).—DV
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