Vibe Audio BlackDeath Competition 18 D1 SPL (BDC18D1SPL-V4)
18″ subwoofer · dual 1 Ω · 5,000 W RMS
The Vibe Audio BlackDeath Competition 18 D1 SPL (BDC18D1SPL-V4) is a 18″ subwoofer. With Qts 0.36 and EBP 73 it works both sealed and ported: sealed is tighter and smaller, ported is deeper and louder.
| 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 |
- Fs, Vas and Sd don't match the moving mass of 861.14 g (they give 1166 g) — one of the spec sheet values is probably wrong.
Recommended box
For a sedan, one sub, 5,000 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) | Dry and tight · 0.46 |
|---|---|
| Fc | 39 Hz |
| F3 (−3 dB, no cabin gain) | 69 Hz |
| Example box (outside) | 20 1/16″ × 20 1/16″ × 14 13/16″ |
Ported
deeper, louder| Tuning (Fb) | 33 Hz |
|---|---|
| Port | slot 5 7/8 × 19 7/16″, 44″ long |
| Port velocity at 5,000 W | 82 ft/s |
| F3 (−3 dB, no cabin gain) | 29 Hz |
| Example box (outside) | 31 1/2″ × 20 7/8″ × 27 3/8″ |
Deeper: 3.46 ft³ (98 L) tuned to 25 Hz, 31 1/2″ × 20 7/8″ × 18 5/16″ 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 | 18″ |
|---|---|
| Voice coils | dual 1 Ω |
| RMS power | 5,000 W |
| Fs | 30.3 Hz |
| Qts | 0.36 |
| Qes | 0.416 |
| Qms | 2.53 |
| Vas | 1.61 ft³ |
| Re (one coil) | 1 Ω |
|---|---|
| Sd | 180.5 in² |
| Xmax | 1.02″ |
| Vd | 184.7 in³ calc. |
| Mms | 1,166 g calc. |
| BL | 23.1 T·m calc. |
| EBP | 73 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 86.8 dB calc. |
Mounting dimensions
| Cutout diameter | 16 13/16″ |
|---|---|
| Mounting depth | 12 3/8″ |
| Overall diameter | 18″ |
“≈” 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 Vibe Audio 18″ models
- Vibe Audio BlackDeath Comp 18 HEX D1 (BLACKDEATHC18HEX-V7) 18″ · dual 1 Ω
Similar 18″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- American Bass GODZILLA-1811 2.37 ft³ sealed · 5.44 ft³ ported
- American Bass XMAXXX-1822 2.24 ft³ sealed · 2.79 ft³ ported
- DC Audio NEO 4.0 18 D0.7 2.54 ft³ sealed · 5.33 ft³ ported
- DC Audio NEO 4.0 18 D1 2.54 ft³ sealed · 5.33 ft³ ported
- DC Audio NEO 4.0 18 D2 2.54 ft³ sealed · 5.33 ft³ ported
- Ascendant Audio SMD V2 18 D1 2.95 ft³ sealed · 5.54 ft³ ported
All 18″ subwoofers in our database →
FAQ
What box does the Vibe Audio BlackDeath Competition 18 D1 SPL (BDC18D1SPL-V4) need?
Recommended net volume: 2.42 ft³ sealed, 5.33 ft³ ported tuned to 33 Hz — for one sub in a sedan at 5,000 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 Competition 18 D1 SPL (BDC18D1SPL-V4) Thiele/Small specs?
Fs 30.3 Hz, Qts 0.36, Vas 1.61 ft³, Xmax 1.02″, Sd 180.5 in².
What is the Vibe Audio BlackDeath Competition 18 D1 SPL (BDC18D1SPL-V4) mounting depth?
Mounting depth is 12 3/8″, cutout diameter 16 13/16″. The inside depth of the box must exceed the mounting depth by at least 1″.
How much power does the Vibe Audio BlackDeath Competition 18 D1 SPL (BDC18D1SPL-V4) handle and how do I wire it?
RMS power rating: 5,000 W. Dual 1 Ω voice coils: series gives 2 Ω, parallel gives 0.5 Ω at the amp. Wiring for several subs and amp power — in the wiring calculator.
Is the Vibe Audio BlackDeath Competition 18 D1 SPL (BDC18D1SPL-V4) better sealed or ported?
EBP 73: both work — sealed 2.42 ft³ is tighter and smaller, ported 5.33 ft³ tuned to 33 Hz is deeper and louder.
What port does the Vibe Audio BlackDeath Competition 18 D1 SPL (BDC18D1SPL-V4) need?
For the 5.33 ft³ ported box tuned to 33 Hz: slot 5 7/8 × 19 7/16″, 44″ long, area 114.9 in²; or a round port Ø12 1/16″, ≈ 44″ long. Port air speed at 5,000 W: 82 ft/s.
What box do two Vibe Audio BlackDeath Competition 18 D1 SPL (BDC18D1SPL-V4) subs need?
Two subs need twice the volume: 4.84 ft³ sealed, or 10.67 ft³ ported at the same 33 Hz tuning with twice the port area. One shared chamber or one per sub — whatever fits your vehicle.