Rockville W8K5S4

8″ subwoofer · 4 Ω · 200 W RMS

Fs 44.9 HzQts 0.54Vas 0.46 ft³

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 volume0.39 ft³ (11 L)
Qtc0.80
Fc67 Hz
F3 (−3 dB, no cabin gain)63 Hz
Example box (outside)10 5/8″ × 10 5/8″ × 10 1/16″
Open sealed box in designer

Ported

Net volume1.17 ft³ (33 L)
Tuning (Fb)36 Hz
Portslot 1 9/16 × 14 5/16″, 36″ long
Port velocity at 200 W39 ft/s
F3 (−3 dB, no cabin gain)32 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 8 13/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs44.9 Hz
Qts0.54
Qes0.591
Qms5.88
Vas0.46 ft³
Re3.43 Ω
Sd31.2 in²
Xmax≈ 0.39″
Mms55 g calc.
BL9.5 T·m calc.
EBP76 — sealed or ported calc.
Sensitivity, 1 W / 1 m85 dB calc.

General

Size8″
Voice coils4 Ω
RMS power200 W

Mounting dimensions

Ø≈ 8 7/16″cutout Ø7 5/16″mounting depth 3 9/16″magnet Ø4 3/4″
Cutout diameter7 5/16″
Mounting depth3 9/16″
Magnet diameter4 3/4″

“≈” 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 Rockville 8″ models