Deaf Bonce Apocalypse DB-4518R D2

18″ subwoofer · dual 2 Ω · 4,500 W RMS

Fs 29.4 HzQts 0.34Vas 5.40 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)
Qtc0.58
Fc50 Hz
F3 (−3 dB, no cabin gain)66 Hz
Example box (outside)21 1/4″ × 21 1/4″ × 15 5/16″
Open sealed box in designer

Ported

Net volume3.64 ft³ (103 L)
Tuning (Fb)40 Hz
Port2 round ports Ø4″, 8 11/16″ long
Port velocity at 4,500 W287 ft/s
F3 (−3 dB, no cabin gain)38 Hz
Example box (outside)26″ × 22 1/16″ × 15 3/8″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs29.4 Hz
Qts0.34
Qes0.36
Qms6
Vas5.40 ft³
Re (one coil)≈ 1.7 Ω
Sd≈ 180.6 in²
Xmax0.89″
EBP82 — sealed or ported calc.
Sensitivity, 1 W / 1 m92.3 dB calc.

General

Size18″
Voice coilsdual 2 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