Massive Audio GTX154

15″ subwoofer · dual 4 Ω · 700 W RMS

Fs 34.6 HzQts 0.72Vas 2.36 ft³Xmax 0.59″

Recommended box

For a sedan, one sub, 700 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 volume2.86 ft³ (81 L)
Qtc0.97
Fc47 Hz
F3 (−3 dB, no cabin gain)39 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 12 1/8″
Open sealed box in designer

Ported

Net volume4.87 ft³ (138 L)
Tuning (Fb)32 Hz
Portslot 2 3/4 × 16 5/16″, 18 1/2″ long
Port velocity at 700 W64 ft/s
F3 (−3 dB, no cabin gain)27 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 21 1/4″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs34.6 Hz
Qts0.72
Qes0.82
Qms5.99
Vas2.36 ft³
Re (one coil)3.4 Ω
Sd125.6 in²
Xmax0.59″
Vd74.1 in³ calc.
Mms294 g calc.
BL16.3 T·m calc.
EBP42 — suits sealed calc.
Sensitivity, 1 W / 1 m87.3 dB calc.

General

Size15″
Voice coilsdual 4 Ω
RMS power700 W

Mounting dimensions

Ø15 3/8″cutout Ø13 5/8″mounting depth 8 1/16″magnet Ø≈ 8 7/8″
Cutout diameter13 5/8″
Mounting depth8 1/16″
Overall diameter15 3/8″

“≈” 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 15″ models