CT Sounds STRATO-15 D4

15″ subwoofer · dual 4 Ω · 1,250 W RMS

Fs 29.2 HzQts 0.64Vas 2.17 ft³Xmax 0.59″

Recommended box

For a sedan, one sub, 1,250 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 volume2.83 ft³ (80 L)
Qtc0.85
Fc39 Hz
F3 (−3 dB, no cabin gain)35 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 12″
Open sealed box in designer

Ported

Net volume4.84 ft³ (137 L)
Tuning (Fb)27 Hz
Portslot 3 9/16 × 16 5/16″, 37 1/2″ long
Port velocity at 1,250 W64 ft/s
F3 (−3 dB, no cabin gain)23 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 24 3/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs29.2 Hz
Qts0.64
Qes0.712
Qms6.59
Vas2.17 ft³
Re (one coil)3.26 Ω
Sd124.7 in²
Xmax0.59″
Vd73.6 in³ calc.
Mms443 g calc.
BL19.3 T·m calc.
EBP41 — suits sealed calc.
Sensitivity, 1 W / 1 m85.3 dB calc.

General

Size15″
Voice coilsdual 4 Ω
RMS power1,250 W

Mounting dimensions

Ø15 1/2″cutout Ø13 7/8″mounting depth 8 1/8″magnet Ø≈ 9 1/16″
Cutout diameter13 7/8″
Mounting depth8 1/8″
Overall diameter15 1/2″

“≈” 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 CT Sounds 15″ models