Hertz Mille Pro MP 300 D2.3 (DVC 2+2 ohm)

12″ subwoofer · dual 2 Ω · 600 W RMS

Fs 23 HzQts 0.49Vas 3.11 ft³Xmax 0.63″

Recommended box

For a sedan, one sub, 600 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 volume1.84 ft³ (52 L)
Qtc0.80
Fc38 Hz
F3 (−3 dB, no cabin gain)36 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 3/16″
Open sealed box in designer

Ported

Net volume3.18 ft³ (90 L)
Tuning (Fb)27 Hz
Portslot 2 3/16 × 14 5/16″, 31 3/16″ long
Port velocity at 600 W63 ft/s
F3 (−3 dB, no cabin gain)25 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 17 7/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs23 Hz
Qts0.49
Qes0.53
Qms5.9
Vas3.11 ft³
Re (one coil)2 Ω
Sd82.3 in²
Xmax0.63″
Vd51.8 in³ calc.
Mms217 g calc.
BL10.9 T·m calc.
EBP43 — suits sealed calc.
Sensitivity, 1 W / 1 m85.1 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power600 W

Mounting dimensions

Ø12 5/8″cutout Ø11 5/16″mounting depth 6 7/16″magnet Ø6 1/2″
Cutout diameter11 5/16″
Mounting depth6 7/16″
Overall diameter12 5/8″
Magnet diameter6 1/2″

“≈” 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 Hertz 12″ models