Blaupunkt GTw 1200

12″ subwoofer · 4 Ω · 220 W RMS

Fs 28 HzQts 0.57Vas 2.15 ft³Xmax 0.31″

Recommended box

For a sedan, one sub, 220 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 volume1.73 ft³ (49 L)
Qtc0.85
Fc42 Hz
F3 (−3 dB, no cabin gain)38 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 8 3/4″
Open sealed box in designer

Ported

Net volume2.93 ft³ (83 L)
Tuning (Fb)30 Hz
Portslot 1 9/16 × 14 5/16″, 18 15/16″ long
Port velocity at 220 W54 ft/s
F3 (−3 dB, no cabin gain)27 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 14 15/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs28 Hz
Qts0.57
Qes0.62
Qms6.6
Vas2.15 ft³
Re≈ 3.4 Ω
Sd≈ 76 in²
Xmax0.31″
EBP45 — suits sealed calc.
Sensitivity, 1 W / 1 m85.3 dB calc.

General

Size12″
Voice coils4 Ω
RMS power220 W

Mounting dimensions

Ø≈ 12 5/16″cutout Ø11 1/8″mounting depth 5 1/2″magnet Ø≈ 7 3/16″
Cutout diameter11 1/8″
Mounting depth5 1/2″

“≈” 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 Blaupunkt 12″ models