Hertz Energy ES 250.5 (SVC 4 ohm)

10″ subwoofer · 4 Ω · 250 W RMS

Fs 35 HzQts 0.61Vas 0.98 ft³Xmax 0.35″

Recommended box

For a sedan, one sub, 250 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)
Qtc0.83
Fc47 Hz
F3 (−3 dB, no cabin gain)43 Hz
Example box (outside)12 3/16″ × 12 3/16″ × 19 11/16″
Open sealed box in designer

Ported

Net volume1.98 ft³ (56 L)
Tuning (Fb)32 Hz
Portslot 1 9/16 × 14 5/16″, 25 7/8″ long
Port velocity at 250 W52 ft/s
F3 (−3 dB, no cabin gain)28 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 11 7/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs35 Hz
Qts0.61
Qes0.65
Qms9.6
Vas0.98 ft³
Re2.9 Ω
Sd51.1 in²
Xmax0.35″
Vd18.1 in³ calc.
Mms115 g calc.
BL10.6 T·m calc.
EBP54 — sealed or ported calc.
Sensitivity, 1 W / 1 m84.6 dB calc.

General

Size10″
Voice coils4 Ω
RMS power250 W

Mounting dimensions

Ø10 3/8″cutout Ø9 3/16″mounting depth 4 11/16″magnet Ø≈ 6″
Cutout diameter9 3/16″
Mounting depth4 11/16″
Overall diameter10 3/8″

Cone area (Sd) calculated from Fs, Vas and Mms: 51.1 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 10″ models