Diamond DES122

12″ subwoofer · dual 2 Ω · 500 W RMS

Fs 32 HzQts 0.75Vas 1.09 ft³Xmax 0.62″

Recommended box

For a sedan, one sub, 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 volume1.77 ft³ (50 L)
Qtc0.96
Fc41 Hz
F3 (−3 dB, no cabin gain)34 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 21 5/16″
Open sealed box in designer

Ported

Net volume3.00 ft³ (85 L)
Tuning (Fb)28 Hz
Portslot 2 3/16 × 14 5/16″, 30 5/8″ long
Port velocity at 500 W63 ft/s
F3 (−3 dB, no cabin gain)23 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 16 11/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs32 Hz
Qts0.75
Qes0.83
Qms8
Vas1.09 ft³
Re (one coil)1.6 Ω
Sd77.5 in²
Xmax0.62″
Vd47.9 in³ calc.
Mms283 g calc.
BL10.5 T·m calc.
EBP39 — suits sealed calc.
Sensitivity, 1 W / 1 m82.9 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power500 W

Mounting dimensions

Ø12 9/16″cutout Ø11 1/16″mounting depth 6 5/8″magnet Ø≈ 7 3/16″
Cutout diameter11 1/16″
Mounting depth6 5/8″
Overall diameter12 9/16″

“≈” 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