Massive Audio GTX124R

12″ subwoofer · dual 4 Ω · 1,000 W RMS

Fs 43.4 HzQts 0.86Vas 0.61 ft³Xmax 0.59″

Recommended box

For a sedan, one sub, 1,000 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 volume1.24 ft³ (35 L)
Qtc1.06
Fc53 Hz
F3 (−3 dB, no cabin gain)42 Hz
Example box (outside)13 3/4″ × 13 3/4″ × 16 9/16″
Open sealed box in designer

Ported

Net volume3.07 ft³ (87 L)
Tuning (Fb)30 Hz
Portslot 3 3/8 × 14 5/16″, 40 5/8″ long
Port velocity at 1,000 W64 ft/s
F3 (−3 dB, no cabin gain)25 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 19 7/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs43.4 Hz
Qts0.86
Qes0.99
Qms6.84
Vas0.61 ft³
Re (one coil)3.4 Ω
Sd79.1 in²
Xmax0.59″
Vd46.7 in³ calc.
Mms285 g calc.
BL16.3 T·m calc.
EBP44 — suits sealed calc.
Sensitivity, 1 W / 1 m83.6 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power1,000 W

Mounting dimensions

Ø12 5/16″cutout Ø10 13/16″mounting depth 6 3/4″magnet Ø≈ 7″
Cutout diameter10 13/16″
Mounting depth6 3/4″
Overall diameter12 5/16″

“≈” 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 Massive Audio 12″ models