DS18 SLC-MD12.4D

12″ subwoofer · dual 4 Ω · 250 W RMS

Fs 31.6 HzQts 1.02Vas 4.21 ft³Xmax 0.54″

Recommended box

For a sedan, one sub, 250 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 volume1.80 ft³ (51 L)
Qtc1.86
Fc58 Hz
F3 (−3 dB, no cabin gain)41 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 1/16″
Open sealed box in designer

Ported

Net volume3.04 ft³ (86 L)
Tuning (Fb)47 Hz
Portslot 1 9/16 × 14 5/16″, 5 1/16″ long
Port velocity at 250 W62 ft/s
F3 (−3 dB, no cabin gain)40 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 14 3/8″
Open ported box in designer
2030405060801001502007278849096102HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs31.6 Hz
Qts1.02
Qes1.213
Qms6.3
Vas4.21 ft³
Re (one coil)3.5 Ω
Sd78.5 in²
Xmax0.54″
Vd42.7 in³ calc.
Mms77 g calc.
BL6.7 T·m calc.
EBP26 — suits sealed calc.
Sensitivity, 1 W / 1 m86.9 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power250 W

Mounting dimensions

Ø12 3/8″cutout Ø11 1/8″mounting depth 4 15/16″magnet Ø≈ 7 1/4″
Cutout diameter11 1/8″
Mounting depth4 15/16″
Overall diameter12 3/8″

“≈” 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 DS18 12″ models