Pride M.45 12 D0.75 (M45.12D07)

12″ subwoofer · dual 0.75 Ω · 4,500 W RMS

Fs 27.1 HzQts 0.21Vas 1.31 ft³Xmax 1.42″
The published specs don’t add up:

Recommended box

For a sedan, one sub, 4,500 W. It’s the same math as the designer’s step-by-step mode, where you can fit the box to your space, vehicle and amp and get plans, a cut sheet and DXF.

Sealed

Net volume1.17 ft³ (33 L)
Qtc0.31
Fc40 Hz
F3 (−3 dB, no cabin gain)116 Hz
Example box (outside)15 3/8″ × 15 3/8″ × 12 3/4″
Open sealed box in designer

Ported

Net volume1.59 ft³ (45 L)
Tuning (Fb)25 Hz
Portround port Ø2 1/2″, 11 9/16″ long
Port velocity at 4,500 W866 ft/s
F3 (−3 dB, no cabin gain)105 Hz
Example box (outside)19 1/2″ × 16 1/8″ × 12 13/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs27.1 Hz
Qts0.21
Qes0.227
Qms3.77
Vas1.31 ft³
Re (one coil)0.75 Ω
Sd82.2 in²
Xmax1.42″
Vd116.4 in³ calc.
Mms369 g calc.
BL14.4 T·m calc.
EBP119 — suits ported calc.
Sensitivity, 1 W / 1 m87.1 dB calc.

General

Size12″
Voice coilsdual 0.75 Ω
RMS power4,500 W

Mounting dimensions

Ø12 13/16″cutout Ø12 1/16″mounting depth 10 1/4″magnet Ø10 1/16″
Cutout diameter12 1/16″
Mounting depth10 1/4″
Overall diameter12 13/16″
Magnet diameter10 1/16″

“≈” means the value isn’t in the spec sheet and a typical value for the size is used; “calc.” means it’s calculated from the published parameters. Check the manufacturer’s spec sheet before you build.

Data sources

Other Pride 12″ models