Hertz Energy ES 200 (SVC 4 ohm)

8″ subwoofer · 4 Ω · 200 W RMS

33 HzFs, resonance

0.49Qts

0.57 ft³Vas

0.35″Xmax

200 WRMS

Source	web.archive.org · manufacturer data
Checked against source	October 2026
Thiele/Small parameters	complete
Mounting dimensions	3 of 4 — missing: magnet diameter; the designer will use an estimate

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

smaller, tighter

0.35 ft³ (10 L)

Net volume

Bass character (Qtc)	Tight and punchy · 0.79
Fc	53 Hz
F3 (−3 dB, no cabin gain)	51 Hz
Example box (outside)	10 1/4″ × 10 1/4″ × 10 1/16″

Open sealed box in designer

Ported

deeper, louder

0.53 ft³ (15 L)

Net volume

Tuning (Fb)	44 Hz
Port	round port Ø2 1/2″, 11 1/8″ long
Port velocity at 200 W	121 ft/s
F3 (−3 dB, no cabin gain)	39 Hz
Example box (outside)	15 1/8″ × 15 3/4″ × 6 11/16″

At 200 W this example’s port will be noisy: air speed 121 ft/s, while the limit is 82 ft/s. It stays quiet up to about 90 W. Full power needs a port of at least 7.4 in², which means a bigger box than this example — size it in the designer.

Open ported box in designer

Deeper: 1.09 ft³ (31 L) tuned to 29 Hz, 31 1/2″ × 15 3/4″ × 7 15/16″ outside — a bigger box with flatter deep bass. Open in the calculator

Where to buy Amazon

Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Size	8″
Voice coils	4 Ω
RMS power	200 W
Fs	33 Hz
Qts	0.49
Qes	0.53
Qms	7
Vas	0.57 ft³

Re	2.9 Ω
Sd	33.2 in²
Xmax	0.35″
Vd	11.8 in³ calc.
Mms	94 g calc.
BL	10.3 T·m calc.
EBP	62 — sealed or ported calc.
Sensitivity, 1 W / 1 m	82.4 dB calc.

Mounting dimensions

Cutout diameter	7 1/8″
Mounting depth	4 3/16″
Overall diameter	8 1/2″

“≈” 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

web.archive.org/web/20090306162349/http://www.hertzaudiovideo.com:80/Doc/pdf_es2

Other Hertz 8″ models

Hertz Cento CS 200 S4 (SVC 4 ohm) 8″ · 4 Ω
Hertz Energy ES 200.5 (SVC 4 ohm) 8″ · 4 Ω
Hertz Energy ES F20.5 (free-air/shallow, SVC 4 ohm) 8″ · 4 Ω
Hertz Mille Legend ML 2000.3 (SVC 4 ohm) 8″ · 4 Ω

Similar 8″ subwoofers from other brands

Close in Fs, Qts and Vas — a box of similar volume will suit them.

Audio System HX 08 SQ 0.32 ft³ sealed · 0.53 ft³ ported
JL Audio 8W3v3-4 0.28 ft³ sealed · 0.35 ft³ ported
Soundstream EXACT 8 0.28 ft³ sealed · 0.53 ft³ ported
Audiobahn AW831X 0.32 ft³ sealed · 0.53 ft³ ported
ESX VXP84G (4 Ohm) 0.42 ft³ sealed · 0.60 ft³ ported
ESX VXP822G (2x2 Ohm) 0.35 ft³ sealed · 0.60 ft³ ported

FAQ

What box does the Hertz Energy ES 200 (SVC 4 ohm) need?

Recommended net volume: 0.35 ft³ sealed, 0.53 ft³ ported tuned to 44 Hz — for one sub in a sedan at 200 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.

What are the Hertz Energy ES 200 (SVC 4 ohm) Thiele/Small specs?

Fs 33 Hz, Qts 0.49, Vas 0.57 ft³, Xmax 0.35″, Sd 33.2 in².

What is the Hertz Energy ES 200 (SVC 4 ohm) mounting depth?

Mounting depth is 4 3/16″, cutout diameter 7 1/8″. The inside depth of the box must exceed the mounting depth by at least 1″.

How much power does the Hertz Energy ES 200 (SVC 4 ohm) handle and how do I wire it?

RMS power rating: 200 W. Wiring for several subs and amp power — in the wiring calculator.