Rockville W15K9D4

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

Fs 29.8 HzQts 0.54Vas 3.30 ft³Xmax 1.18″

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 volume2.75 ft³ (78 L)
Qtc0.80
Fc44 Hz
F3 (−3 dB, no cabin gain)42 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 11 1/2″
Open sealed box in designer

Ported

Net volume4.94 ft³ (140 L)
Tuning (Fb)30 Hz
Portslot 3 3/4 × 16 11/16″, 31″ long
Port velocity at 1,250 W62 ft/s
F3 (−3 dB, no cabin gain)27 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 23 7/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs29.8 Hz
Qts0.54
Qes0.58
Qms7.72
Vas3.30 ft³
Re (one coil)4 Ω
Sd127.8 in²
Xmax1.18″
Vd150.9 in³ calc.
Mms294 g calc.
BL19.5 T·m calc.
EBP51 — sealed or ported calc.
Sensitivity, 1 W / 1 m88.3 dB calc.

General

Size15″
Voice coilsdual 4 Ω
RMS power1,250 W

Mounting dimensions

Ø≈ 15 1/4″cutout Ø14 1/8″mounting depth 8 1/4″magnet Ø7 1/2″
Cutout diameter14 1/8″
Mounting depth8 1/4″
Magnet diameter7 1/2″

Cone area (Sd) calculated from Fs, Vas and Mms: 127.8 in².

“≈” 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 Rockville 15″ models