JL Audio Fathom f113 Subwoofer


On the Bench

THD+N measurements are within an 80 kHz bandwidth.

At 20 Hz, 100 dB, and 1 foot, distortion was 12.3%. This is quite excellent. 20 Hz is very tough to deliver from relatively small enclosures.

At 25 Hz, THD+N came down to 8.2%. I was able to obtain a maximum of 121 dB at 25 Hz and 1 foot. That is a lot of output at such a low frequency.

At 31.5 Hz, it was less than 5%.

At 40 Hz, about 2%.

And at 50 Hz, a very manageable 1.6%.

THD+N vs. Frequency showed the f113 to stay below 10% most of the time, all the way down.

Room response measurements indicated a flat response down to 20 Hz up close, and when the microphone was moved farther away, the room effects entered into the picture. That is where the ARO (Automatic Room Optimization) comes into play.

For the ARO test, we placed the microphone 1 meter from the f113 and set 40 Hz to 100 dB. You can see that the calibration reduced the peak area between 20 Hz and 70 Hz. I imagine future iterations of this woofer will include more EQ bands so that the peak just below 20 Hz and the ones at 70 Hz and 90 Hz could be reduced. This would be a four-band PEQ. I use a crossover at 50 Hz because I have large speakers, so one band would be enough for my setup. But, more EQ bands would still be nice.

All in all, superb performance. Something I might expect from a much larger sub.