Hertz Energy ES 380.5 (SVC 4 ohm)

15″ subwoofer · 4 Ω · 450 W RMS

32 HzFs, resonance
0.89Qts
3.49 ft³Vas
0.35″Xmax
450 WRMS

Recommended box

For a sedan, one sub, 450 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

smaller, tighter
2.86 ft³ (81 L)
Net volume
Qtc1.33
Fc48 Hz
F3 (−3 dB, no cabin gain)35 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 12 1/8″
Open sealed box in designer

Ported

deeper, louder
4.87 ft³ (138 L)
Net volume
Tuning (Fb)37 Hz
Portslot 2 3/16 × 16 5/16″, 9 1/4″ long
Port velocity at 450 W64 ft/s
F3 (−3 dB, no cabin gain)31 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 20 1/16″
Open ported box in designer
2030405060801001502007278849096102HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs32 Hz
Qts0.89
Qes0.96
Qms13
Vas3.49 ft³
Re3.1 Ω
Sd125.9 in²
Xmax0.35″
Vd44.6 in³ calc.
Mms234 g calc.
BL12.3 T·m calc.
EBP33 — suits sealed calc.
Sensitivity, 1 W / 1 m87.3 dB calc.

General

Size15″
Voice coils4 Ω
RMS power450 W

Mounting dimensions

Ø15 9/16″cutout Ø13 3/4″mounting depth 5 15/16″magnet Ø≈ 8 15/16″
Cutout diameter13 3/4″
Mounting depth5 15/16″
Overall diameter15 9/16″

Cone area (Sd) calculated from Fs, Vas and Mms: 125.9 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 15″ models