Review: NXG NX-BAS-500 subwoofer Page 2


Frequency response
32 to 93 Hz ±3 dB

Bass output (CEA-2010A standard)
• Ultra-low bass (20-31.5 Hz) average: 108.0 dB
20 Hz 96.2 dB
25 Hz 105.5 dB
31.5 Hz 114.0 dB L
• Low bass (40-63 Hz) average: 116.5 dB
40 Hz 116.1 dB L
50 Hz 116.8 dB L
63 Hz 116.5 dB L

I measured the frequency response of the NX-BAS-500 using my Clio FW audio analyzer in log chirp mode, close-miking the woofer and port, scaling the port response, then summing the two. This response is smoothed to 1/12th octave. I confirmed this with a ground plane measurement, placing the microphone 2 meters from the sub outdoors, then smoothing the result by 1/3rd octave to remove the effects of reflections from nearby objects. The results matched well, both yielding a ±3 dB response down to 32 Hz. Both frequency response measurements show substantial low-pass roll-off above 80 Hz, even with the crossover at the highest (120 Hz) setting—which confirms my impression that the NX-BAS-500’s upper bass response is a little weak. Definitely a sub that works best with larger satellites.

I performed CEA-2010A output measurement at 3 meters, then added +9.5 dB to scale the measurements to the 1-meter reporting standard mandated by CEA-2010. Averages are done in pascals. An L indicates that the maximum level was reached without reaching any of the CEA-2010 distortion thresholds, indicating that the output at this frequency is determined by a limiter or the maximum gain of the sub’s internal electronics.

What’s impressive about these numbers is how consistent they are between 31.5 and 63 Hz. Normally in a sub like this we see maximum output at 63 and maybe 50 Hz, then rapidly falling output by the time you hit 31.5 Hz. It’s not a bottom-octave powerhouse, but at 96.2 dB at 20 Hz, it does have enough oomph down there for respectable reproduction of low tones.

Bottom Line

Sure, the NX-BAS-500 looks like a generic subwoofer. Yet it’s got almost everything I’d want—but never expect to get—in a $399 sub. Most subs in this price range focus on the 40-80 Hz octave, delivering maximum punch but not much deep-bass power. The NX-BAS-500, in contrast, is more like a price-reduced version of the technically superb subs sold by SVS, with ample deep bass reproduction and admirably even output at all frequencies.