MTX Audio RT15-04

15″ subwoofer · 4 Ω · 300 W RMS

Fs 20 HzQts 0.48Vas 7.88 ft³Xmax 0.57″

Recommended box

For a sedan, one sub, 300 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 volume2.93 ft³ (83 L)
Qtc0.92
Fc38 Hz
F3 (−3 dB, no cabin gain)33 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 12 3/8″
Open sealed box in designer

Ported

Net volume4.98 ft³ (141 L)
Tuning (Fb)28 Hz
Portslot 1 9/16 × 16 5/16″, 13 3/8″ long
Port velocity at 300 W64 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 20 9/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs20 Hz
Qts0.48
Qes0.52
Qms6.07
Vas7.88 ft³
Re3.6 Ω
Sd128.7 in²
Xmax0.57″
Vd73.4 in³ calc.
Mms277 g calc.
BL15.5 T·m calc.
EBP38 — suits sealed calc.
Sensitivity, 1 W / 1 m87.4 dB calc.

General

Size15″
Voice coils4 Ω
RMS power300 W

Mounting dimensions

Ø15 3/8″cutout Ø13 7/8″mounting depth 6 9/16″magnet Ø≈ 9″
Cutout diameter13 7/8″
Mounting depth6 9/16″
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 MTX Audio 15″ models