27 to 108 Hz ±3 dB
Bass output (CEA-2010 standard)
• Ultra-low bass (20-31.5 Hz) average: 88.1 dB
20 Hz 76.5 dB
25 Hz 86.6 dB
31.5 Hz 101.2 dB
• Low bass (40-63 Hz) average: 119.4 dB
40 Hz 117.3 dB (L)
50 Hz 122.4 dB (L)
63 Hz 118.4 dB (L)
To measure the frequency response of the SDS-12, I used my Clio FW analyzer (in stepped sine mode) and microphone, with the mic placed 2 meters in front of the sub. The sub’s crossover was set to bypass. The measurement is smoothed to 1/6th of an octave. Response is solid down to about 25 Hz, but it drops quickly below that. Combined low-pass function of the crossover and driver with the crossover frequency set to 80 Hz is -24 dB/octave.
I measured bass output of the SDS-12 using the CEA-2010 method, with the sub turned on its side so that the active driver and the passive radiator were equidistant from the microphone. Clearly, this was designed as a “punch” sub, with maximum output in the low bass (40-63 Hz) octave. Here, the SDS-12 delivers truly awesome bass power for its size. Ultra-low bass (20-31.5 Hz) output isn’t terribly strong. There’s decent oomph down to 31.5 Hz but it falls fast below that, although to the SDS-12’s credit it does deliver measurable response down to 20 Hz. — Test Bench by Brent Butterworth
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