CDT Audio HD-1200CFS

12″ subwoofer · 4 Ω · 250 W RMS

Fs 28.4 HzQts 0.50Vas 2.97 ft³Xmax 0.59″

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)
Qtc0.81
Fc46 Hz
F3 (−3 dB, no cabin gain)43 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 1/16″
Open sealed box in designer

Ported

Net volume3.07 ft³ (87 L)
Tuning (Fb)32 Hz
Portslot 1 9/16 × 14 5/16″, 15 1/4″ long
Port velocity at 250 W59 ft/s
F3 (−3 dB, no cabin gain)29 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 15 3/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs28.4 Hz
Qts0.50
Qes0.543
Qms5.9
Vas2.97 ft³
Re3.93 Ω
Sd79.1 in²
Xmax0.59″
Vd46.7 in³ calc.
Mms138 g calc.
BL13.4 T·m calc.
EBP52 — sealed or ported calc.
Sensitivity, 1 W / 1 m87.5 dB calc.

General

Size12″
Voice coils4 Ω
RMS power250 W

Mounting dimensions

Ø≈ 12 5/16″cutout ≈ Ø11 1/8″mounting depth ≈ 5 7/8″magnet Ø≈ 7 3/16″
Cutout diameter≈ 11 1/8″
Mounting depth≈ 5 7/8″

Cone area (Sd) calculated from Fs, Vas and Mms: 79.1 in².

“≈” 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