Hertz Hi-Energy HX 250 (SVC 4 ohm)

10″ subwoofer · 4 Ω · 450 W RMS

Fs 37 HzQts 0.44Vas 0.85 ft³Xmax 0.55″

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

Net volume0.49 ft³ (14 L)
Qtc0.73
Fc61 Hz
F3 (−3 dB, no cabin gain)62 Hz
Example box (outside)12 3/16″ × 12 3/16″ × 9 11/16″
Open sealed box in designer

Ported

Net volume1.24 ft³ (35 L)
Tuning (Fb)35 Hz
Port2 round ports Ø3″, 22 5/8″ long
Port velocity at 450 W91 ft/s
F3 (−3 dB, no cabin gain)33 Hz
Example box (outside)27 5/8″ × 15 3/4″ × 8 7/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs37 Hz
Qts0.44
Qes0.49
Qms4.7
Vas0.85 ft³
Re2.9 Ω
Sd53.4 in²
Xmax0.55″
Vd29.4 in³ calc.
Mms129 g calc.
BL13.3 T·m calc.
EBP76 — sealed or ported calc.
Sensitivity, 1 W / 1 m86 dB calc.

General

Size10″
Voice coils4 Ω
RMS power450 W

Mounting dimensions

Ø10 9/16″cutout Ø9 3/16″mounting depth 5 7/8″magnet Ø≈ 6″
Cutout diameter9 3/16″
Mounting depth5 7/8″
Overall diameter10 9/16″

Cone area (Sd) calculated from Fs, Vas and Mms: 53.4 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