Orion Cobalt 8 DVC (original)
8″ subwoofer · dual 4 Ω
The Orion Cobalt 8 DVC (original) is a 8″ subwoofer. With Qts 0.39 and EBP 79 it works both sealed and ported: sealed is tighter and smaller, ported is deeper and louder. Modest excursion (Xmax 0.22″) — for clean sound at moderate levels, not for SPL competitions.
| 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| Bass character (Qtc) | Tight and punchy · 0.79 |
|---|---|
| Fc | 69 Hz |
| F3 (−3 dB, no cabin gain) | 67 Hz |
| Example box (outside) | 10 1/4″ × 10 1/4″ × 8 1/2″ |
Ported
deeper, louder| Tuning (Fb) | 37 Hz |
|---|---|
| Port | slot 1 3/8 × 14 5/16″, 38 5/16″ long |
| Port velocity at 300 W | 45 ft/s |
| F3 (−3 dB, no cabin gain) | 35 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 7 3/4″ |
Deeper: 0.88 ft³ (25 L) tuned to 36 Hz, 31 1/2″ × 15 3/4″ × 7 1/4″ outside — a bigger box with flatter deep bass. Open in the calculator
Projects with this subwoofer
Boxes that users designed and published: plans, cut sheet and response graph.
Thiele/Small parameters
| Size | 8″ |
|---|---|
| Voice coils | dual 4 Ω |
| RMS power | — |
| Fs | 34 Hz |
| Qts | 0.39 |
| Qes | 0.43 |
| Qms | 4.2 |
| Vas | 0.89 ft³ |
| Re (one coil) | 3.45 Ω |
|---|---|
| Sd | 31 in² |
| Xmax | 0.22″ |
| Vd | 7 in³ calc. |
| Mms | 49 g calc. |
| BL | 9.2 T·m calc. |
| EBP | 79 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 85.6 dB calc. |
Mounting dimensions
| Cutout diameter | 7 1/4″ |
|---|---|
| Mounting depth | 3 7/8″ |
| Overall diameter | 8 1/2″ |
Where it fits in a vehicle
Spots from our vehicle guides where the cutout, mounting depth and recommended box fit. The spot sizes are approximate — measure your own vehicle.
- F-150 SuperCrew — under the rear seat sealed and ported box
- F-150 regular cab — behind the seat sealed and ported box
- Ram Crew Cab — under the rear seat sealed and ported box
- Ram regular cab — behind the seat sealed and ported box
- Tacoma Double Cab — under the rear seat sealed and ported box
- Tacoma Access Cab — behind the front seats sealed and ported box
- Bronco 4-door — behind the rear seat sealed and ported box
- Wrangler 4-door, hard top — behind the rear seat sealed and ported box
- Wrangler 4-door, soft top — behind the rear seat sealed and ported box
- Silverado / Sierra Crew Cab — under the rear seat sealed and ported box
- Silverado / Sierra regular cab — behind the seat sealed and ported box
- Spare tire well sealed box
- Polaris RZR / Ranger — under the seat sealed box
- Can-Am — under the seat sealed box
- Avalanche — under the rear seat sealed and ported box
- FJ Cruiser — behind the rear seat sealed and ported box
- El Camino 1978–87 — behind the seat sealed and ported box
- C10 1973–87 regular cab — behind the seat sealed and ported box
- Cherokee XJ — cargo area, spare moved out sealed and ported box
- Excursion — behind the third row sealed and ported box
- Mustang 2015–2023 coupe — trunk sealed and ported box
- Challenger / Charger — trunk sealed and ported box
- Tesla Model 3 — well under the trunk floor sealed and ported box
- Club Car Precedent — under the rear seat sealed and ported box
“≈” 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 SVC (1999) 8″ · 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.
- ESX SX840 (4 Ohm) 0.32 ft³ sealed · 0.99 ft³ ported
- STX W.20.300.2x2.MC 0.32 ft³ sealed · 0.74 ft³ ported
- Diamond M3080 0.32 ft³ sealed · 0.71 ft³ ported
- STX W.20.300.2x4.MC 0.35 ft³ sealed · 0.71 ft³ ported
- Audison Prima APS 8 R (SVC 4 ohm, reflex) 0.32 ft³ sealed · 1.09 ft³ ported
- Dayton Audio DCS205-4 0.32 ft³ sealed · 1.02 ft³ ported
FAQ
What box does the Orion Cobalt 8 DVC (original) need?
Recommended net volume: 0.28 ft³ sealed, 0.92 ft³ ported tuned to 37 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 DVC (original) Thiele/Small specs?
Fs 34 Hz, Qts 0.39, Vas 0.89 ft³, Xmax 0.22″, Sd 31 in².
What is the Orion Cobalt 8 DVC (original) 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″.
Is the Orion Cobalt 8 DVC (original) better sealed or ported?
EBP 79: both work — sealed 0.28 ft³ is tighter and smaller, ported 0.92 ft³ tuned to 37 Hz is deeper and louder.
What port does the Orion Cobalt 8 DVC (original) need?
For the 0.92 ft³ ported box tuned to 37 Hz: slot 1 3/8 × 14 5/16″, 38 5/16″ long, area 19.7 in²; or a round port Ø5″, ≈ 38 5/16″ long. Port air speed at 300 W: 45 ft/s.
What box do two Orion Cobalt 8 DVC (original) subs need?
Two subs need twice the volume: 0.57 ft³ sealed, or 1.84 ft³ ported at the same 37 Hz tuning with twice the port area. One shared chamber or one per sub — whatever fits your vehicle.