Rythmik Audio F12G Direct Servo Subwoofer In-Depth Review 2013 -> 2020, by Erin Hardison (hardisj)https://www.erinsaudiocorner.com/loudspeakers/rythmik-f12g-direct-servo-subwoofer/
[ Raw Subwoofer Drive Unit Conclusion
On its own, this driver performs really well. The low Fs of 20.8Hz
, reasonable enclosure size requirements, good linearity, and low distortion with nearly 18mm one-way linear excursion all are attributes that make this a great value at its current MSRP of $179. I honestly would have no issue at all recommending it. Getting down to brass tacks, what this means is with the F12G Subwoofer, you know you have a great starting point with the SW-12-04 driver.
One thing that is a nice added touch is the felt material on the underside of the cone (shown in the pictures above)
. This is to minimize any audible tinsel lead slap on the cone. And I can say without a doubt, as I was testing this woofer to very high excursion levels (likely higher than anyone would actually achieve in real use)
, I never once heard any mechanical noise from the woofer driver.
Overall, the Harmonic Distortion components at 2.83v/1m are really low
. The red PHD line is a representation of perceived harmonic distortion. You’ll note this is very, very low. With 20v input, putting the mean SPL from 20 to 300hz at about 98dB, THD climbs to about 3% THD at 60hz. However, this is mostly comprised of 2nd order distortion while 3rd order distortion is below 1.5%. Whether or not this is an audible factor seems to be of hot debate. The key here is the relationship between 2nd and 3rd order and that they’re well separated
, indicating no serious flaws in the driver. ]http://www.rythmikaudio.com/F12G.html