Hertz Energy ES 200.5 (SVC 4 ohm)

8″ subwoofer · 4 Ω · 200 W RMS

Fs 40 HzQts 0.50Vas 0.37 ft³Xmax 0.35″

Recommended box

For a sedan, one sub, 200 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 volume0.28 ft³ (8 L)
Qtc0.77
Fc61 Hz
F3 (−3 dB, no cabin gain)59 Hz
Example box (outside)10 1/4″ × 10 1/4″ × 8 1/2″
Open sealed box in designer

Ported

Net volume0.78 ft³ (22 L)
Tuning (Fb)34 Hz
Portround port Ø2 1/2″, 13″ long
Port velocity at 200 W144 ft/s
F3 (−3 dB, no cabin gain)31 Hz
Example box (outside)21 1/2″ × 15 3/4″ × 6 11/16″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs40 Hz
Qts0.50
Qes0.53
Qms10.57
Vas0.37 ft³
Re2.9 Ω
Sd30 in²
Xmax0.35″
Vd10.6 in³ calc.
Mms80 g calc.
BL10.5 T·m calc.
EBP75 — sealed or ported calc.
Sensitivity, 1 W / 1 m83 dB calc.

General

Size8″
Voice coils4 Ω
RMS power200 W

Mounting dimensions

Ø8 1/2″cutout Ø7 1/8″mounting depth 4 3/16″magnet Ø≈ 4 5/8″
Cutout diameter7 1/8″
Mounting depth4 3/16″
Overall diameter8 1/2″

Cone area (Sd) calculated from Fs, Vas and Mms: 30 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 8″ models