Phoenix Gold RX112D

12″ subwoofer · dual 4 Ω · 200 W RMS

Fs 28 HzQts 0.56Vas 2.49 ft³Xmax 0.49″

Recommended box

For a sedan, one sub, 200 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 volume1.77 ft³ (50 L)
Qtc0.87
Fc43 Hz
F3 (−3 dB, no cabin gain)39 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 8 15/16″
Open sealed box in designer

Ported

Net volume3.00 ft³ (85 L)
Tuning (Fb)31 Hz
Portslot 1 9/16 × 14 5/16″, 17″ long
Port velocity at 200 W49 ft/s
F3 (−3 dB, no cabin gain)28 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 15 1/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs28 Hz
Qts0.56
Qes0.667
Qms3.5
Vas2.49 ft³
Re (one coil)3.4 Ω
Sd77.5 in²
Xmax0.49″
Vd38.1 in³ calc.
Mms162 g calc.
BL12.1 T·m calc.
EBP42 — suits sealed calc.
Sensitivity, 1 W / 1 m85.7 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power200 W

Mounting dimensions

Ø≈ 12 5/16″cutout Ø11 1/8″mounting depth 5 11/16″magnet Ø≈ 7 3/16″
Cutout diameter11 1/8″
Mounting depth5 11/16″

Judging by its value, the published Re is for both coils in parallel — converted to per coil.

“≈” 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 Phoenix Gold 12″ models