Rockford Fosgate Prime R2D4-10

10″ subwoofer · dual 4 Ω · 250 W RMS

Fs 34.9 HzQts 0.53Vas 1.36 ft³Xmax 0.26″

Recommended box

For a sedan, one sub, 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 volume1.06 ft³ (30 L)
Qtc0.80
Fc53 Hz
F3 (−3 dB, no cabin gain)50 Hz
Example box (outside)12 3/16″ × 12 3/16″ × 18 1/16″
Open sealed box in designer

Ported

Net volume2.05 ft³ (58 L)
Tuning (Fb)34 Hz
Portslot 1 9/16 × 14 5/16″, 21 9/16″ long
Port velocity at 250 W53 ft/s
F3 (−3 dB, no cabin gain)31 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 11 7/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs34.9 Hz
Qts0.53
Qes0.58
Qms6.44
Vas1.36 ft³
Re (one coil)3.92 Ω
Sd52.7 in²
Xmax0.26″
Vd13.5 in³ calc.
Mms89 g calc.
BL11.5 T·m calc.
EBP60 — sealed or ported calc.
Sensitivity, 1 W / 1 m86.5 dB calc.

General

Size10″
Voice coilsdual 4 Ω
RMS power250 W

Mounting dimensions

Ø≈ 10 5/16″cutout Ø9 1/8″mounting depth 4 5/16″magnet Ø≈ 5 15/16″
Cutout diameter9 1/8″
Mounting depth4 5/16″

“≈” 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 Rockford Fosgate 10″ models