Hsu VTF-15H Subwoofer HT Labs Measures

HT Labs Measures

This graph shows the quasi-anechoic (employing close-miking) frequency response of the VTF-15H subwoofer with one port open (blue trace) and with both ports sealed (red trace). In both cases, the Operating Mode switch was set to EQ1 and the Q Control was set to maximum.

The VTF-15H’s close-miked response with one port open, normalized to the level at 80 hertz, indicates that the lower –3-decibel point is at 24 Hz and the –6-dB point is at 18 Hz. The upper –3-dB point is at 162 Hz with the Crossover switch set to Out.

The VTF-15H’s close-miked response with both ports sealed, normalized to the level at 80 Hz, indicates that the lower –3-dB point is at 27 Hz and the –6-dB point is at 20 Hz. The upper –3-dB point is at 165 Hz with the Crossover switch set to Out.—MJP

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