Vibe Audio BlackDeath 15 D4 (BD15D4-V4)
15″ subwoofer · dual 4 Ω · 1,600 W RMS · also as BlackDeath 15 D2 (BD15D2-V4) (dual 2 Ω)
The Vibe Audio BlackDeath 15 D4 (BD15D4-V4) is a 15″ subwoofer. With Qts 0.79 and EBP 32 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, 1,600 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) | Boomy, with a bump · 1.00 |
|---|---|
| Fc | 38 Hz |
| F3 (−3 dB, no cabin gain) | 31 Hz |
| Example box (outside) | 31 1/2″ × 17 11/16″ × 11 3/8″ |
Ported
deeper, louder| Tuning (Fb) | 33 Hz |
|---|---|
| Port | slot 2 3/8 × 16 5/16″, 45 3/8″ long |
| Port velocity at 1,600 W | 60 ft/s |
| F3 (−3 dB, no cabin gain) | 29 Hz |
| Example box (outside) | 31 1/2″ × 17 11/16″ × 13 1/16″ |
Deeper: 4.52 ft³ (128 L) tuned to 26 Hz, 31 1/2″ × 17 11/16″ × 24 11/16″ 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 | 15″ |
|---|---|
| Voice coils | dual 4 Ω |
| RMS power | 1,600 W |
| Fs | 30.1 Hz |
| Qts | 0.79 |
| Qes | 0.954 |
| Qms | 4.61 |
| Vas | 1.56 ft³ |
| Re (one coil) | 3.2 Ω |
|---|---|
| Sd | 117 in² |
| Xmax | 0.63″ |
| Vd | 73.7 in³ calc. |
| Mms | 508 g calc. |
| BL | 18 T·m calc. |
| EBP | 32 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 83 dB calc. |
Mounting dimensions
| Cutout diameter | 13 7/8″ |
|---|---|
| Mounting depth | 8 1/4″ |
| Overall diameter | 15 7/16″ |
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.
- Excursion — behind the third row 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 15 D2 (BD15D2-V4) | dual 2 Ω | 1.8 Ω | 0.839 | 1.57 ft³ | 2.65 ft³ | 1.87 ft³ · 33 Hz |
| Vibe Audio BlackDeath 15 D4 (BD15D4-V4) | dual 4 Ω | 3.2 Ω | 0.954 | 1.56 ft³ | 2.65 ft³ | 1.87 ft³ · 33 Hz |
Other Vibe Audio 15″ models
- Vibe Audio BlackAir 15 D2 (BLACKAIR15D2-V7) 15″ · dual 2 Ω
- Vibe Audio BlackDeath 15 D1 SPL (BD15D1SPL-V4) 15″ · dual 1 Ω
- Vibe Audio BlackDeath 15 D2 SPL (BD15D2SPL-V4) 15″ · dual 2 Ω
- Vibe Audio BlackDeath 15 HEX D1 (BLACKDEATH15HEX-V7) 15″ · dual 1 Ω
- Vibe Audio BlackDeath Comp 15 HEX D1 (BLACKDEATHC15HEX-V7) 15″ · dual 1 Ω
Similar 15″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- American Bass XR-1522 2.75 ft³ sealed · 3.25 ft³ ported
- B2 Audio RIOT15 D2 v2 2.97 ft³ sealed · 2.08 ft³ ported
- B2 Audio IS15 D4 v3 2.83 ft³ sealed · 1.98 ft³ ported
- DL Audio Raven 15 (2+2) 2.83 ft³ sealed · 1.98 ft³ ported
- Sky High Car Audio FXB-15 D4 2.86 ft³ sealed · 2.01 ft³ ported
- DC Audio Level 4 15 D1 2.79 ft³ sealed · 1.94 ft³ ported
All 15″ subwoofers in our database →
FAQ
What box does the Vibe Audio BlackDeath 15 D4 (BD15D4-V4) need?
Recommended net volume: 2.65 ft³ sealed, 1.87 ft³ ported tuned to 33 Hz — for one sub in a sedan at 1,600 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 15 D4 (BD15D4-V4) Thiele/Small specs?
Fs 30.1 Hz, Qts 0.79, Vas 1.56 ft³, Xmax 0.63″, Sd 117 in².
What is the Vibe Audio BlackDeath 15 D4 (BD15D4-V4) mounting depth?
Mounting depth is 8 1/4″, cutout diameter 13 7/8″. The inside depth of the box must exceed the mounting depth by at least 1″.
How much power does the Vibe Audio BlackDeath 15 D4 (BD15D4-V4) handle and how do I wire it?
RMS power rating: 1,600 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 15 D4 (BD15D4-V4) better sealed or ported?
EBP 32: a sealed box (2.65 ft³) suits it best — tight bass in a compact enclosure. Ported is possible (1.87 ft³, tuned to 33 Hz) but larger.
What port does the Vibe Audio BlackDeath 15 D4 (BD15D4-V4) need?
For the 1.87 ft³ ported box tuned to 33 Hz: slot 2 3/8 × 16 5/16″, 45 3/8″ long, area 38.5 in²; or a round port Ø7″, ≈ 45 3/8″ long. Port air speed at 1,600 W: 60 ft/s.
What box do two Vibe Audio BlackDeath 15 D4 (BD15D4-V4) subs need?
Two subs need twice the volume: 5.30 ft³ sealed, or 3.74 ft³ ported at the same 33 Hz tuning with twice the port area. One shared chamber or one per sub — whatever fits your vehicle.