Hertz Mille Pro MP 300 D4.3 (DVC 4+4 ohm)

12″ subwoofer · dual 4 Ω · 600 W RMS

Fs 24 HzQts 0.42Vas 2.61 ft³Xmax 0.67″

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 volume	0.99 ft³ (28 L)
Qtc	0.80
Fc	46 Hz
F3 (−3 dB, no cabin gain)	44 Hz
Example box (outside)	14 9/16″ × 14 9/16″ × 12 3/8″

Open sealed box in designer

Ported

Net volume	3.18 ft³ (90 L)
Tuning (Fb)	25 Hz
Port	slot 2 3/16 × 14 5/16″, 37 3/16″ long
Port velocity at 600 W	65 ft/s
F3 (−3 dB, no cabin gain)	23 Hz
Example box (outside)	31 1/2″ × 15 3/4″ × 18″

Open ported box in designer

Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs	24 Hz
Qts	0.42
Qes	0.45
Qms	5.9
Vas	2.61 ft³
Re (one coil)	3.8 Ω
Sd	82.3 in²
Xmax	0.67″
Vd	55.1 in³ calc.
Mms	237 g calc.
BL	17.4 T·m calc.
EBP	53 — sealed or ported calc.
Sensitivity, 1 W / 1 m	85.6 dB calc.

General

Size	12″
Voice coils	dual 4 Ω
RMS power	600 W

Mounting dimensions

Cutout diameter	11 5/16″
Mounting depth	6 7/16″
Overall diameter	12 5/8″
Magnet diameter	6 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

Hertz Cento CS 300 S2 (SVC 2 ohm) 12″ · 2 Ω
Hertz Cento CS 300 S4 (SVC 4 ohm) 12″ · 4 Ω
Hertz Dieci DS 30.3 (SVC 4 ohm) 12″ · 4 Ω
Hertz Dieci DS 300.3 (SVC 4 ohm) 12″ · 4 Ω
Hertz Energy ES 300.5 (SVC 4 ohm) 12″ · 4 Ω
Hertz Energy ES 300D.5 (DVC 4+4 ohm) 12″ · dual 4 Ω
Hertz Energy ES F30.5 (free-air/shallow, SVC 4 ohm) 12″ · 4 Ω
Hertz Hi-Energy HX 300 (SVC 4 ohm) 12″ · 4 Ω
Hertz Hi-Energy HX 300 D (DVC 4+4 ohm) 12″ · dual 4 Ω
Hertz Mille Pro MP 300 D2.3 (DVC 2+2 ohm) 12″ · dual 2 Ω
Hertz Mille Pro MPS 300 S2 (shallow, SVC 2 ohm) 12″ · 2 Ω
Hertz Mille Pro MPS 300 S4 (shallow, SVC 4 ohm) 12″ · 4 Ω