Vibe Audio BlackDeath Comp 18 HEX D1 (BLACKDEATHC18HEX-V7)
18″ subwoofer · dual 1 Ω · 5,000 W RMS
The Vibe Audio BlackDeath Comp 18 HEX D1 (BLACKDEATHC18HEX-V7) is a 18″ subwoofer. With Qts 0.32 and EBP 76 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 | not in the spec sheet: Xmax — typical value for the size used |
| Mounting dimensions | 1 of 4 — missing: mounting depth, frame outer diameter, magnet diameter; the designer will use an estimate |
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 · 0.61 |
|---|---|
| Fc | 49 Hz |
| F3 (−3 dB, no cabin gain) | 61 Hz |
| Example box (outside) | 20 1/16″ × 20 1/16″ × 10 7/8″ |
Ported
deeper, louder| Tuning (Fb) | 30 Hz |
|---|---|
| Port | slot 2 9/16 × 19 7/16″, 21 7/8″ long |
| Port velocity at 5,000 W | 179 ft/s |
| F3 (−3 dB, no cabin gain) | 28 Hz |
| Example box (outside) | 31 7/16″ × 20 7/8″ × 20 1/4″ |
At 5,000 W this example’s port will be noisy: air speed 179 ft/s, while the limit is 82 ft/s. It stays quiet up to about 1,050 W. Full power needs a port of at least 108.4 in², which means a bigger box than this example — size it in the designer.
Open ported box in designerDeeper: 3.43 ft³ (97 L) tuned to 29 Hz, 31 1/2″ × 20 7/8″ × 20 1/8″ 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 | 25.7 Hz |
| Qts | 0.32 |
| Qes | 0.34 |
| Qms | 5.09 |
| Vas | 4.33 ft³ |
| Re (one coil) | 0.9 Ω |
|---|---|
| Sd | 179.8 in² |
| Xmax | ≈ 0.39″ |
| Mms | 595 g calc. |
| BL | 16 T·m calc. |
| EBP | 76 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 89.9 dB calc. |
Mounting dimensions
| Cutout diameter | 16 3/4″ |
|---|---|
| Mounting depth | ≈ 8 1/4″ |
Judging by its value, the published Re is for both coils in series — converted to per coil.
“≈” 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 Competition 18 D1 SPL (BDC18D1SPL-V4) 18″ · dual 1 Ω
Similar 18″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- Edge EDX18D1SPL-E7 1.62 ft³ sealed · 5.33 ft³ ported
- Sundown Audio NSv4-18 D2 2.86 ft³ sealed · 5.23 ft³ ported
- Pride T V.3 18 D1 1.92 ft³ sealed · 5.33 ft³ ported
- Pride T V.3 18 D2 1.92 ft³ sealed · 5.33 ft³ ported
- Edge EDX18D1-E7 1.62 ft³ sealed · 5.33 ft³ ported
- URAL Patriot 18 (2+2) 1.62 ft³ sealed · 5.33 ft³ ported
All 18″ subwoofers in our database →
FAQ
What box does the Vibe Audio BlackDeath Comp 18 HEX D1 (BLACKDEATHC18HEX-V7) need?
Recommended net volume: 1.62 ft³ sealed, 5.33 ft³ ported tuned to 30 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 Comp 18 HEX D1 (BLACKDEATHC18HEX-V7) Thiele/Small specs?
Fs 25.7 Hz, Qts 0.32, Vas 4.33 ft³, Sd 179.8 in².
How much power does the Vibe Audio BlackDeath Comp 18 HEX D1 (BLACKDEATHC18HEX-V7) 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 Comp 18 HEX D1 (BLACKDEATHC18HEX-V7) better sealed or ported?
EBP 76: both work — sealed 1.62 ft³ is tighter and smaller, ported 5.33 ft³ tuned to 30 Hz is deeper and louder.
What port does the Vibe Audio BlackDeath Comp 18 HEX D1 (BLACKDEATHC18HEX-V7) need?
For the 5.33 ft³ ported box tuned to 30 Hz: slot 2 9/16 × 19 7/16″, 21 7/8″ long, area 49.8 in²; or a round port Ø7 15/16″, ≈ 21 7/8″ long. Port air speed at 5,000 W: 179 ft/s.
What box do two Vibe Audio BlackDeath Comp 18 HEX D1 (BLACKDEATHC18HEX-V7) subs need?
Two subs need twice the volume: 3.25 ft³ sealed, or 10.67 ft³ ported at the same 30 Hz tuning with twice the port area. One shared chamber or one per sub — whatever fits your vehicle.