Let me fill in with more information. The drivers shown in is our least expensive DS1501 model. It is aluminum cone driver. We have a higher power DS1510 driver with one-piece dish cone. I will update the photo in a day or two.
FV15:18"(W)x24"(H)x24"(D) just for the enclosure. Back panel control/heat sink adds 1" and the grille adds 1". My guess is most customer will leave the grille off. FV15 has two tuning options: 18hz and 12hz. For max output, we would recommend 18hz tuning. The rumble filter switch now serves as the purpose of setting up the required filter to match these two tuning modes. Two driver/amp options:
- Regular FV15: DS1501 black aluminum cone driver with A370PEQ2 amp, with introduction price of $999 on black oak, and
- FV15-HP: DS1510 black aluminum cone driver with H600PEQ amp (600WRMS), with introduction price of $1199 on black oak.
F25: 19"(W)x33"(H)x21"(D). Back panel control/heat sink adds 1" and the grille adds 1". Two DS1501 drivers with one H600PEQ amp (600WRMS). $1299 in black oak. Spike feet are $45 extra.
As always, these are servo based subwoofers. Servo subs are about improving sound quality (in tightness, clarify, and musicality) and it is not just the improvement in sound that you can hear, it is also the improvement in the driver's damping factor that you can "feel". I have a demo unit with two of our drivers DS1200 side by side. On the left hand side, the driver is configured as nonservo and on the right hand side, the driver is configured as servo. The customers can push the cone and feel the difference in the force that the cone push back at you (i.e., reaction force). I can send this unit to RMAF (either in GR's booth or in Lowther's booth). I welcome anyone go to RMAF to try and feel the difference. BTW, the difference is not trivial. When the improvement is 3x, it is quite obvious.
Further on the subject of damping force. High damping force is trait of larger motors. We don't have to look at subwoofer for the clue of high damping force (as subwoofers design involves other trad-offs that somethings big motor does not translate to high damping force), but look at midbass drivers. For those who work with midbass drivers frequently may find those with big motors tend to give a cleaner and faster response. That is because the Qts value of large motor driver is low. Qts means high damping force. Low Qts also means high BL value. The downside is low Qts is the output around the corner frequency is significantly reduced because of the output around there is inversely proportional to BL value. The purpose of servo is to address this problem while maintaining high damping force that is not practice with actual magnets.
