Orion Cobalt 8 SVC (1999)

8″ subwoofer · 4 Ω

52 HzFs, resonance

0.46Qts

0.71 ft³Vas

0.20″Xmax

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, 300 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 · 0.80
Fc	90 Hz
F3 (−3 dB, no cabin gain)	86 Hz
Example box (outside)	10 1/4″ × 10 1/4″ × 10 1/16″

Open sealed box in designer

Ported

deeper, louder

0.57 ft³ (16 L)

Net volume

Tuning (Fb)	41 Hz
Port	round port Ø2 1/2″, 12 3/16″ long
Port velocity at 300 W	124 ft/s
F3 (−3 dB, no cabin gain)	60 Hz
Example box (outside)	17 1/4″ × 15 3/4″ × 6 5/16″

At 300 W this example’s port will be noisy: air speed 124 ft/s, while the limit is 82 ft/s. It stays quiet up to about 130 W. Full power needs a port of at least 7.6 in², which means a bigger box than this example — size it in the designer.

Open ported box in designer

Deeper: 1.13 ft³ (32 L) tuned to 47 Hz, 31 1/2″ × 15 3/4″ × 7 1/2″ 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	—
Fs	52 Hz
Qts	0.46
Qes	0.51
Qms	4.6
Vas	0.71 ft³

Re	3.7 Ω
Sd	31 in²
Xmax	0.20″
Vd	6.1 in³ calc.
Mms	26 g calc.
BL	7.9 T·m calc.
EBP	102 — suits ported calc.
Sensitivity, 1 W / 1 m	89.4 dB calc.

Mounting dimensions

Cutout diameter	7 1/4″
Mounting depth	3 7/8″
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

Other Orion 8″ models

Orion Cobalt 8 DVC (1999) 8″ · dual 4 Ω
Orion Cobalt 8 DVC (original) 8″ · dual 4 Ω
Orion Cobalt 8 SVC (original) 8″ · 4 Ω
Orion XTR 8 DVC (original) 8″ · dual 4 Ω
Orion XTR 8 SVC (original) 8″ · 4 Ω
Orion XTR2 8 DVC 8″ · dual 4 Ω
Orion XTR2 8 SVC 8″ · 4 Ω
Orion Xtreme 8 DVC 8″ · dual 4 Ω
Orion Xtreme 8 SVC 8″ · 4 Ω

Similar 8″ subwoofers from other brands

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

Dayton Audio PCS8-4 0.42 ft³ sealed · 0.57 ft³ ported
Lanzar MAX8 0.32 ft³ sealed · 0.99 ft³ ported
Hertz Energy ES F20.5 (free-air/shallow, SVC 4 ohm) 0.32 ft³ sealed · 0.53 ft³ ported
Polk Audio EX8 (EX Series II) 0.57 ft³ sealed · 0.53 ft³ ported
Audison Prima APBMW S8-2.2 (BMW/MINI underseat, SVC 2 ohm) 0.53 ft³ sealed · 0.64 ft³ ported
Gladen RS 08 (SVC 4 ohm) 0.42 ft³ sealed · 0.53 ft³ ported

FAQ

What box does the Orion Cobalt 8 SVC (1999) need?

Recommended net volume: 0.35 ft³ sealed, 0.57 ft³ ported tuned to 41 Hz — for one sub in a sedan at 300 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.

What are the Orion Cobalt 8 SVC (1999) Thiele/Small specs?

Fs 52 Hz, Qts 0.46, Vas 0.71 ft³, Xmax 0.20″, Sd 31 in².

What is the Orion Cobalt 8 SVC (1999) mounting depth?

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