Diamond DMD124SH

12″ subwoofer · dual 4 Ω · 300 W RMS

Fs 46.5 HzQts 0.92Vas 1.09 ft³Xmax 0.35″

Recommended box

For a sedan, one sub, 300 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 volume1.91 ft³ (54 L)
Qtc1.15
Fc58 Hz
F3 (−3 dB, no cabin gain)45 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 1/2″
Open sealed box in designer

Ported

Net volume3.25 ft³ (92 L)
Tuning (Fb)39 Hz
Portslot 1 15/16 × 14 5/16″, 10 7/8″ long
Port velocity at 300 W65 ft/s
F3 (−3 dB, no cabin gain)32 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 15 3/4″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs46.5 Hz
Qts0.92
Qes1.02
Qms9
Vas1.09 ft³
Re (one coil)3 Ω
Sd83.5 in²
Xmax0.35″
Vd28.9 in³ calc.
Mms156 g calc.
BL11.6 T·m calc.
EBP46 — suits sealed calc.
Sensitivity, 1 W / 1 m86.9 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power300 W

Mounting dimensions

Ø12 13/16″cutout Ø11 1/16″mounting depth 3″magnet Ø≈ 7 3/16″
Cutout diameter11 1/16″
Mounting depth3″
Overall diameter12 13/16″

“≈” 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 Diamond 12″ models