Vibe Audio BlackDeath 12 D4 (BD12D4-V4)
12″ subwoofer · dual 4 Ω · 1,500 W RMS · also as BlackDeath 12 D2 (BD12D2-V4) (dual 2 Ω)
The Vibe Audio BlackDeath 12 D4 (BD12D4-V4) is a 12″ subwoofer. With Qts 0.65 and EBP 44 it suits a sealed box: tight bass in a small enclosure; a ported box would need a lot of volume.
| Source | vibeaudio.co.uk · 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, 1,500 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 · 0.80 |
|---|---|
| Fc | 42 Hz |
| F3 (−3 dB, no cabin gain) | 39 Hz |
| Example box (outside) | 14 3/16″ × 14 3/16″ × 14 15/16″ |
Ported
deeper, louder| Tuning (Fb) | 35 Hz |
|---|---|
| Port | slot 1 9/16 × 14 5/16″, 39 5/8″ long |
| Port velocity at 1,500 W | 95 ft/s |
| F3 (−3 dB, no cabin gain) | 30 Hz |
| Example box (outside) | 19 13/16″ × 15 3/4″ × 14 3/16″ |
At 1,500 W this example’s port will be noisy: air speed 95 ft/s, while the limit is 82 ft/s. It stays quiet up to about 1,100 W. Full power needs a port of at least 26.1 in², which means a bigger box than this example — size it in the designer.
Open ported box in designerDeeper: 2.61 ft³ (74 L) tuned to 25 Hz, 31 1/2″ × 15 3/4″ × 18 1/16″ 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 | 12″ |
|---|---|
| Voice coils | dual 4 Ω |
| RMS power | 1,500 W |
| Fs | 33.9 Hz |
| Qts | 0.65 |
| Qes | 0.763 |
| Qms | 4.39 |
| Vas | 0.60 ft³ |
| Re (one coil) | 3.2 Ω |
|---|---|
| Sd | 70.1 in² |
| Xmax | 0.63″ |
| Vd | 44.2 in³ calc. |
| Mms | 374 g calc. |
| BL | 18.3 T·m calc. |
| EBP | 44 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 81.4 dB calc. |
Mounting dimensions
| Cutout diameter | 11 1/8″ |
|---|---|
| Mounting depth | 6 7/8″ |
| Overall diameter | 12 11/16″ |
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.
- 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
- FJ Cruiser — behind the rear seat sealed and ported box
- El Camino 1978–87 — 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
- 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
- vibeaudio.co.uk/wp-content/uploads/2026/04/BD-121-5D2-subwoofer-manual-300425.pd
- vibeaudio.co.uk/wp-content/uploads/2024/07/BD-121-5D2-subwoofer-manual-300425.pd
Voice coil versions
The same sub with different voice coils: the parameters are nearly the same — pick by your amp and wiring.
| Model | Voice coils | Re | Qes | Vas | Sealed | Ported |
|---|---|---|---|---|---|---|
| Vibe Audio BlackDeath 12 D2 (BD12D2-V4) | dual 2 Ω | 1.8 Ω | 0.688 | 0.58 ft³ | 0.74 ft³ | 1.13 ft³ · 35 Hz |
| Vibe Audio BlackDeath 12 D4 (BD12D4-V4) | dual 4 Ω | 3.2 Ω | 0.763 | 0.60 ft³ | 1.17 ft³ | 1.13 ft³ · 35 Hz |
Other Vibe Audio 12″ models
- Vibe Audio BlackAir 12 D2 (BA12D2-V5) 12″ · dual 2 Ω
- Vibe Audio BlackAir 12 D2 (BLACKAIR12D2-V7) 12″ · dual 2 Ω
- Vibe Audio BlackAir 12 D2 (V4) 12″ · dual 2 Ω
- Vibe Audio BlackAir 12 D2S (BLACKAIR12D2S-V3) 12″ · dual 2 Ω
- Vibe Audio BlackDeath 12 D1 SPL (BD12D1SPL-V4) 12″ · dual 1 Ω
- Vibe Audio BlackDeath 12 D2 SPL (BD12D2SPL-V4) 12″ · dual 2 Ω
- Vibe Audio BlackDeath 12 HEX D1 (BLACKDEATH12HEX-V7) 12″ · dual 1 Ω
- Vibe Audio BlackDeath Comp 12 HEX D1 (BLACKDEATHC12HEX-V7) 12″ · dual 1 Ω
- Vibe Audio Pulse 12 (PULSE12-V0) 12″ · 4 Ω
- Vibe Audio Pulse 12 D2 (PULSE12D2-V3) 12″ · dual 2 Ω
- Vibe Audio Slick 12 D2 (SLICK12D2-V0) 12″ · dual 2 Ω
- Vibe Audio Slick 12 D2 (SLICK12D2-V3) 12″ · dual 2 Ω
Similar 12″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- American Bass XR-1222 1.20 ft³ sealed · 2.12 ft³ ported
- Memphis Car Audio M71212 (M7 12", 2ohm setting) 1.02 ft³ sealed · 1.20 ft³ ported
- Soundstream T5.122 1.13 ft³ sealed · 1.31 ft³ ported
- Sundown Audio M12 D2 1.02 ft³ sealed · 1.13 ft³ ported
- Phoenix Gold ELITE2.12D4 (Elite 2, DVC 4 ohm) 0.71 ft³ sealed · 1.27 ft³ ported
- DD Audio 812f D1 1.09 ft³ sealed · 1.20 ft³ ported
- American Bass XR-1244 1.17 ft³ sealed · 2.12 ft³ ported
All 12″ subwoofers in our database →
FAQ
What box does the Vibe Audio BlackDeath 12 D4 (BD12D4-V4) need?
Recommended net volume: 1.17 ft³ sealed, 1.13 ft³ ported tuned to 35 Hz — for one sub in a sedan at 1,500 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.
What are the Vibe Audio BlackDeath 12 D4 (BD12D4-V4) Thiele/Small specs?
Fs 33.9 Hz, Qts 0.65, Vas 0.60 ft³, Xmax 0.63″, Sd 70.1 in².
What is the Vibe Audio BlackDeath 12 D4 (BD12D4-V4) mounting depth?
Mounting depth is 6 7/8″, cutout diameter 11 1/8″. The inside depth of the box must exceed the mounting depth by at least 1″.
How much power does the Vibe Audio BlackDeath 12 D4 (BD12D4-V4) handle and how do I wire it?
RMS power rating: 1,500 W. Dual 4 Ω voice coils: series gives 8 Ω, parallel gives 2 Ω at the amp. Wiring for several subs and amp power — in the wiring calculator.
Is the Vibe Audio BlackDeath 12 D4 (BD12D4-V4) better sealed or ported?
EBP 44: a sealed box (1.17 ft³) suits it best — tight bass in a compact enclosure. Ported is possible (1.13 ft³, tuned to 35 Hz) but larger.
What port does the Vibe Audio BlackDeath 12 D4 (BD12D4-V4) need?
For the 1.13 ft³ ported box tuned to 35 Hz: slot 1 9/16 × 14 5/16″, 39 5/8″ long, area 22.6 in²; or a round port Ø5 3/8″, ≈ 39 5/8″ long. Port air speed at 1,500 W: 95 ft/s.
What box do two Vibe Audio BlackDeath 12 D4 (BD12D4-V4) subs need?
Two subs need twice the volume: 2.33 ft³ sealed, or 2.26 ft³ ported at the same 35 Hz tuning with twice the port area. One shared chamber or one per sub — whatever fits your vehicle.