Hertz Energy ES 300D.5 (DVC 4+4 ohm)

12″ subwoofer · dual 4 Ω · 350 W RMS

Fs 40 HzQts 0.75Vas 1.58 ft³Xmax 0.35″

Recommended box

For a sedan, one sub, 350 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 volume1.91 ft³ (54 L)
Qtc1.02
Fc54 Hz
F3 (−3 dB, no cabin gain)44 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 1/2″
Open sealed box in designer

Ported

Net volume3.21 ft³ (91 L)
Tuning (Fb)37 Hz
Portslot 1 15/16 × 14 5/16″, 12 3/4″ long
Port velocity at 350 W64 ft/s
F3 (−3 dB, no cabin gain)31 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 15 13/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs40 Hz
Qts0.75
Qes0.82
Qms9.28
Vas1.58 ft³
Re (one coil)4 Ω
Sd83.3 in²
Xmax0.35″
Vd29.5 in³ calc.
Mms145 g calc.
BL13.3 T·m calc.
EBP49 — suits sealed calc.
Sensitivity, 1 W / 1 m87.4 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power350 W

Mounting dimensions

Ø12 5/16″cutout Ø10 7/8″mounting depth 5 1/16″magnet Ø≈ 7 1/16″
Cutout diameter10 7/8″
Mounting depth5 1/16″
Overall diameter12 5/16″

Cone area (Sd) calculated from Fs, Vas and Mms: 83.3 in².

“≈” 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