Phoenix Gold SXT12D4 (slim, DVC 4 ohm)

12″ subwoofer · dual 4 Ω · 300 W RMS

Fs 33.1 HzQts 0.70Vas 1.94 ft³Xmax 0.49″

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 volume1.80 ft³ (51 L)
Qtc1.01
Fc48 Hz
F3 (−3 dB, no cabin gain)39 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 1/16″
Open sealed box in designer

Ported

Net volume3.07 ft³ (87 L)
Tuning (Fb)34 Hz
Portslot 1 9/16 × 14 5/16″, 13 1/16″ long
Port velocity at 300 W60 ft/s
F3 (−3 dB, no cabin gain)29 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 15 1/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs33.1 Hz
Qts0.70
Qes0.959
Qms2.61
Vas1.94 ft³
Re (one coil)3.3 Ω
Sd79.1 in²
Xmax0.49″
Vd38.9 in³ calc.
Mms155 g calc.
BL10.5 T·m calc.
EBP35 — suits sealed calc.
Sensitivity, 1 W / 1 m85.2 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power300 W

Mounting dimensions

Ø≈ 12 3/16″cutout Ø11″mounting depth 4 1/4″magnet Ø≈ 7 3/16″
Cutout diameter11″
Mounting depth4 1/4″

“≈” 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