Orion Cobalt 15 SVC (1999)

15″ subwoofer · 4 Ω

27 HzFs, resonance

0.51Qts

11.31 ft³Vas

0.31″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

The published specs don’t add up:

Fs, Vas and Sd give a moving mass of 105 g — unusual for a 15″; check Vas against the spec sheet.

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

2.93 ft³ (83 L)

Net volume

Bass character (Qtc)	Boomy, with a bump · 1.13
Fc	60 Hz
F3 (−3 dB, no cabin gain)	47 Hz
Example box (outside)	31 1/2″ × 17 11/16″ × 12 3/8″

Open sealed box in designer

Ported

deeper, louder

3.78 ft³ (107 L)

Net volume

Tuning (Fb)	30 Hz
Port	slot 1 9/16 × 16 5/16″, 16″ long
Port velocity at 300 W	39 ft/s
F3 (−3 dB, no cabin gain)	40 Hz
Example box (outside)	31 1/2″ × 17 11/16″ × 16 7/16″

Open ported box in designer

Deeper: 4.94 ft³ (140 L) tuned to 42 Hz, 31 1/2″ × 17 11/16″ × 19 3/4″ 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	15″
Voice coils	4 Ω
RMS power	—
Fs	27 Hz
Qts	0.51
Qes	0.6
Qms	3.57
Vas	11.31 ft³

Re	3.3 Ω
Sd	128 in²
Xmax	0.31″
Vd	39.3 in³ calc.
Mms	105 g calc.
BL	9.9 T·m calc.
EBP	45 — suits sealed calc.
Sensitivity, 1 W / 1 m	92.2 dB calc.

Mounting dimensions

Cutout diameter	13 7/8″
Mounting depth	6 3/4″
Overall diameter	15 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 15″ models

Orion 2NT 15 DVC 15″ · dual 4 Ω
Orion 2NT 15 SVC 15″ · 4 Ω
Orion Cobalt 15 DVC (1999) 15″ · dual 4 Ω
Orion Cobalt 15 DVC (original) 15″ · dual 4 Ω
Orion Cobalt 15 SVC (original) 15″ · 4 Ω
Orion HCCA 15D 15″ · dual 2 Ω
Orion HCCA 15D (1999) 15″ · dual 2 Ω
Orion HCCA152 (HCCA 15" DVC 2ohm) 15″ · dual 2 Ω
Orion HCCA152SPL (HCCA SPL 15" DVC 2ohm) 15″ · dual 2 Ω
Orion HCCA154 (HCCA 15" DVC 4ohm) 15″ · dual 4 Ω
Orion HCCA154SPL (HCCA SPL 15" DVC 4ohm) 15″ · dual 4 Ω
Orion NT 15 DVC 15″ · dual 4 Ω

Similar 15″ subwoofers from other brands

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

JBL P1500 3.21 ft³ sealed · 4.17 ft³ ported
Audiopipe TS-AR15 2.83 ft³ sealed · 3.67 ft³ ported
Bomber Upgrade Professional 400W 4 Ohm (SW15UP400-4) 3.04 ft³ sealed · 2.22 ft³ ported
Hertz Energy ES 380 (SVC 4 ohm) 3.04 ft³ sealed · 3.92 ft³ ported
Spyder Nitro 15 700W D2 2.83 ft³ sealed · 3.67 ft³ ported
Spyder Nitro 15 700W D4 2.83 ft³ sealed · 3.67 ft³ ported

FAQ

What box does the Orion Cobalt 15 SVC (1999) need?

Recommended net volume: 2.93 ft³ sealed, 3.78 ft³ ported tuned to 30 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 15 SVC (1999) Thiele/Small specs?

Fs 27 Hz, Qts 0.51, Vas 11.31 ft³, Xmax 0.31″, Sd 128 in².

What is the Orion Cobalt 15 SVC (1999) mounting depth?

Mounting depth is 6 3/4″, cutout diameter 13 7/8″. The inside depth of the box must exceed the mounting depth by at least 1″.