Deaf Bonce Apocalypse DB-4518R D1

18″ subwoofer · dual 1 Ω · 4,500 W RMS

Fs 29 HzQts 0.33Vas 5.26 ft³Xmax 0.89″

Recommended box

For a sedan, one sub, 4,500 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

Net volume2.88 ft³ (81.5 L)
Qtc0.55
Fc49 Hz
F3 (−3 dB, no cabin gain)68 Hz
Example box (outside)21 1/4″ × 21 1/4″ × 15 5/16″
Open sealed box in designer

Ported

Net volume3.46 ft³ (98 L)
Tuning (Fb)35 Hz
Portslot 4 15/16 × 20 5/8″, 55 11/16″ long
Port velocity at 4,500 W63 ft/s
F3 (−3 dB, no cabin gain)35 Hz
Example box (outside)31 1/2″ × 22 1/16″ × 21 7/8″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs29 Hz
Qts0.33
Qes0.349
Qms6
Vas5.26 ft³
Re (one coil)≈ 0.85 Ω
Sd≈ 180.6 in²
Xmax0.89″
EBP83 — sealed or ported calc.
Sensitivity, 1 W / 1 m92.2 dB calc.

General

Size18″
Voice coilsdual 1 Ω
RMS power4,500 W

Mounting dimensions

Ø≈ 19 3/8″cutout Ø18 3/16″mounting depth 12 7/8″magnet Ø≈ 11 13/16″
Cutout diameter18 3/16″
Mounting depth12 7/8″

Only Qts is published — Qms assumed to be 6 and Qes calculated (barely affects box design).

“≈” 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 Deaf Bonce 18″ models