Vibe Audio BlackDeath 15 HEX D1 (BLACKDEATH15HEX-V7)

15″ subwoofer · dual 1 Ω · 2,500 W RMS

Specs

28.1 HzFs

0.33Qts

2.34 ft³Vas

All Thiele/Small parameters ↓

Weight & fit

≈ 7 1/16″Mounting depth

14 1/8″Cutout

2,500 WRMS · dual 1 Ω

Mounting drawing ↓

Box size

1.06 ft³ sealedoutside 17 5/16″ × 17 5/16″ × 9 7/8″ · F3 65 Hz

3.46 ft³ ported, 31 Hz31 1/2″ × 18 1/8″ × 23 11/16″ · port: slot 4 3/4 × 16 11/16″, 56 1/16″ long

Box details and plans ↓

The Vibe Audio BlackDeath 15 HEX D1 (BLACKDEATH15HEX-V7) is a 15″ subwoofer. With Qts 0.33 and EBP 78 it works both sealed and ported: sealed is tighter and smaller, ported is deeper and louder.

Open ported box in designer Open sealed box in designer

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, 2,500 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

1.06 ft³ (30 L)

Net volume

Bass character (Qtc)	Dry and tight · 0.59
Fc	50 Hz
F3 (−3 dB, no cabin gain)	65 Hz
Example box (outside)	17 5/16″ × 17 5/16″ × 9 7/8″

Open sealed box in designer

Ported

deeper, louder

3.46 ft³ (98 L)

Net volume

Tuning (Fb)	31 Hz
Port	slot 4 3/4 × 16 11/16″, 56 1/16″ long
Port velocity at 2,500 W	65 ft/s
F3 (−3 dB, no cabin gain)	28 Hz
Example box (outside)	31 1/2″ × 18 1/8″ × 23 11/16″

Open ported box in designer

Deeper: 2.22 ft³ (63 L) tuned to 30 Hz, 31 1/2″ × 18 1/8″ × 14 5/16″ outside — a bigger box with flatter deep bass. Open in the calculator

Where to buy Amazon

Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Size	15″
Voice coils	dual 1 Ω
RMS power	2,500 W
Fs	28.1 Hz
Qts	0.33
Qes	0.36
Qms	4.06
Vas	2.34 ft³

Re (one coil)	0.85 Ω
Sd	116.3 in²
Xmax	≈ 0.39″
Mms	386 g calc.
BL	12.7 T·m calc.
EBP	78 — sealed or ported calc.
Sensitivity, 1 W / 1 m	88.1 dB calc.

Mounting dimensions

Cutout diameter	14 1/8″
Mounting depth	≈ 7 1/16″

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

vibeaudio.co.uk/wp-content/uploads/2019/08/Blackdeath-subwoofer-manual-050718.pd

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 (BD15D2-V4) 15″ · dual 2 Ω
Vibe Audio BlackDeath 15 D2 SPL (BD15D2SPL-V4) 15″ · dual 2 Ω
Vibe Audio BlackDeath 15 D4 (BD15D4-V4) 15″ · dual 4 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.

Pride LC V.2 15 D2 1.20 ft³ sealed · 3.92 ft³ ported
Fi Audio SP4 15v2+ D2 1.59 ft³ sealed · 3.71 ft³ ported
Pride T V.3 15 D1 1.24 ft³ sealed · 3.96 ft³ ported
Pride T V.3 15 D2 1.24 ft³ sealed · 3.96 ft³ ported
Fi Audio SP4 15v2+ D1 1.59 ft³ sealed · 3.71 ft³ ported
Rockville PUNISHER 15D1 1.20 ft³ sealed · 3.67 ft³ ported

All 15″ subwoofers in our database →

FAQ

What box does the Vibe Audio BlackDeath 15 HEX D1 (BLACKDEATH15HEX-V7) need?

Recommended net volume: 1.06 ft³ sealed, 3.46 ft³ ported tuned to 31 Hz — for one sub in a sedan at 2,500 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 15 HEX D1 (BLACKDEATH15HEX-V7) Thiele/Small specs?

Fs 28.1 Hz, Qts 0.33, Vas 2.34 ft³, Sd 116.3 in².

How much power does the Vibe Audio BlackDeath 15 HEX D1 (BLACKDEATH15HEX-V7) handle and how do I wire it?

RMS power rating: 2,500 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 15 HEX D1 (BLACKDEATH15HEX-V7) better sealed or ported?

EBP 78: both work — sealed 1.06 ft³ is tighter and smaller, ported 3.46 ft³ tuned to 31 Hz is deeper and louder.

What port does the Vibe Audio BlackDeath 15 HEX D1 (BLACKDEATH15HEX-V7) need?

For the 3.46 ft³ ported box tuned to 31 Hz: slot 4 3/4 × 16 11/16″, 56 1/16″ long, area 78.9 in²; or a round port Ø10″, ≈ 56 1/16″ long. Port air speed at 2,500 W: 65 ft/s.

What box do two Vibe Audio BlackDeath 15 HEX D1 (BLACKDEATH15HEX-V7) subs need?

Two subs need twice the volume: 2.12 ft³ sealed, or 6.92 ft³ ported at the same 31 Hz tuning with twice the port area. One shared chamber or one per sub — whatever fits your vehicle.