Sony XS-GTR121L

12″ subwoofer · 4 Ω · 400 W RMS

Fs 35 HzQts 0.45Vas 1.77 ft³Xmax 0.33″

Recommended box

For a sedan, one sub, 400 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 volume0.85 ft³ (24 L)
Qtc0.79
Fc61 Hz
F3 (−3 dB, no cabin gain)59 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 11 9/16″
Open sealed box in designer

Ported

Net volume2.72 ft³ (77 L)
Tuning (Fb)33 Hz
Portslot 1 15/16 × 14 5/16″, 21 1/16″ long
Port velocity at 400 W64 ft/s
F3 (−3 dB, no cabin gain)30 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 14 1/2″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs35 Hz
Qts0.45
Qes0.48
Qms7.9
Vas1.77 ft³
Re3.4 Ω
Sd78.5 in²
Xmax0.33″
Vd26 in³ calc.
Mms150 g calc.
BL15.3 T·m calc.
EBP73 — sealed or ported calc.
Sensitivity, 1 W / 1 m88.5 dB calc.

General

Size12″
Voice coils4 Ω
RMS power400 W

Mounting dimensions

Ø13 1/16″cutout Ø11 1/16″mounting depth 5 3/8″magnet Ø≈ 7 3/16″
Cutout diameter11 1/16″
Mounting depth5 3/8″
Overall diameter13 1/16″

“≈” 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 Sony 12″ models