LABORATORY TEST REPORT
Readers interested in a full technical appraisal of the performance of the GoldenEar SuperSub X Powered Subwoofer should continue on and read the LABORATORY REPORT published on the following pages. Readers should note that the results mentioned in the report, tabulated in performance charts and/or displayed using graphs and/or photographs should be construed as applying only to the specific sample tested.
Newport Test Labs measured the frequency response of the GoldenEar SuperSub X when its crossover was set to maximum as being 30Hz to 150Hz ±3dB. When the crossover is set to minimum, Newport Test Labs measured the frequency response as being 22Hz to 120Hz ±3dB. The frequency response when the LFE input is used was exactly the same as that when the crossover control was set to maximum: 30Hz to 150Hz ±3dB. None of the measured responses marries up with GoldenEar’s specification of 12Hz to 250Hz, but GoldenEar’s specification doesn’t state any dB envelope. As you can see from Graph 1, the GoldenEar SuperSub X certainly produces output at 12Hz and at 250Hz, but at 12Hz the output is down 20dB, and at 250Hz it’s down 25dB!
Graph 1 shows that if you set the crossover frequency to 150Hz, the SuperSub X’s output will be at its most linear over the range 40Hz to 130Hz, where it’s approximately ±3dB, which is an excellent result. If you set the crossover frequency to 40Hz, the SuperSub X will be the most linear over the range 25Hz to 80Hz… again an excellent result. This means if you pair the SuperSub X with a pair of bookshelf speakers and use the maximum crossover setting, you’ll handily extend response almost flat all the way down to 40Hz, and if you pair the SuperSub X with a large pair of floor-standers and use the minimum setting of the crossover control, you’ll equally handily extend the response almost flat down to 25Hz.
Graph 3 shows the nearfield responses of the bass driver(s) and passive radiator(s). You can see that the passive radiators’ maximum output occurs at 25Hz, rolling off very steeply below this frequency, as you’d expect. Above this frequency the passive radiators still produce significant output up to around 80Hz, and there’s some interaction between them at the drivers visible as a slight trough around 43Hz and a slight peak at around 55Hz. As for the drivers, you can see the response below about 30Hz is the same no matter what setting of the crossover frequency control you use. Above that, the passive radiators also exert some influence on the response of the drivers themselves, more so at lower settings of the crossover frequency control, but the response of the bass drivers is still remarkably linear, particularly at the 150Hz setting of the crossover.
Overall, excellent performance from such a small powered subwoofer. Steve Holding