- Written by John E. Johnson, Jr.
- Published on 14 April 2011
On the Bench
Distortion tests were performed within an 80 kHz bandwidth. The crossover was set to Bypass.
I was unable to get significant output at 20 Hz, so I am reporting the tests starting at 25 Hz, where at 82 dB, there was 10% THD+N, which has become the standard in maximum acceptable distortion for a subwoofer. So, for all subsequent tests, I set the volume at 82 dB.
At 31.5 Hz, distortion was 3%, which is pretty good for this little guy.
At 40 Hz, there was only 1.8% THD+N. Again, a little surprising for a small enclosure subwoofer.
At 50 Hz, distortion was somewhat higher than it was at 40 Hz, but still acceptable.
The in-room frequency response at 1 foot was reasonably flat between 32 Hz and 100 Hz.
Averaging six frequency response measurements from different positions in the room, ranging from 1 foot to 3 meters, produced the following curve. The dip between 40 Hz and 50 Hz is a room issue.