Model
Fi Car Audio SP4 V2 12 D2
Rating
DIAM
FS(Hz)
VAS(l)
QTS
PWR(W)
SPL(dB)
IMP(Ohm)
avb
+156 P-Bass
6 Dec 2020, 21:37
Enclosure
Closed
+156 P-Bass
6 Dec 2020, 22:48
Description
I used stock parameters from local speaker DB. The box I optimised for this woofer to have acceptable group delay at every frequency. Without cabin gain 100 dB SPL is under 20 Hz, and with SBL's stock cabin gain the transfer function graph is in "+" up from 11 Hz, it have ideal RMS power handling down to under 20 Hz, and vent air velocity graph just touches the red line under 20 Hz. It is buildable, the largest dimension is less than 900 mm, and the sides should be turned somehow (front = bottom, etc...).
Enclosure
Vented
+156 P-Bass
7 Dec 2020, 00:12
Description
I used stock parameters from local speaker DB. This negative ratio BP4 box I optimised for this woofer firstly: to have F3high=60 Hz (the sub bass range's top frequency), and transfer function graph just touches the 0dB line, secondary: to have ideal RMS power handling down to 10Hz, and vent air velocity just touches the red line. Without cabin gain 13Hz=100dB SPL, and group delay graph just touches the red line. The box is really compact, just watch out for the power: basket in closed chamber!
Enclosure
4th Order Bandpass
Description
I used stock parameters from local speaker DB. The box I optimised for this woofer to have ideal RMS power handling down to 10 Hz. Without cabin gain 100 dB SPL is at 14 Hz, and with stock cabin gain (55 Hz / 12 dB) the transfer function graph is in "+" from 10 up to 60 Hz - so it is usable on the whole official sub bass range (20 - 60 Hz).