Morel Primo 804 (SVC 4 ohm)

8″ subwoofer · 4 Ω · 200 W RMS

Fs 45 HzQts 0.59Vas 0.44 ft³Xmax 0.31″

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 volume0.53 ft³ (15 L)
Qtc0.80
Fc61 Hz
F3 (−3 dB, no cabin gain)57 Hz
Example box (outside)10 5/8″ × 10 5/8″ × 12 15/16″
Open sealed box in designer

Ported

Net volume1.31 ft³ (37 L)
Tuning (Fb)35 Hz
Portslot 1 9/16 × 14 5/16″, 33 3/4″ long
Port velocity at 200 W41 ft/s
F3 (−3 dB, no cabin gain)31 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 1/4″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs45 Hz
Qts0.59
Qes0.68
Qms4.44
Vas0.44 ft³
Re3.2 Ω
Sd33.9 in²
Xmax0.31″
Vd10.7 in³ calc.
Mms67 g calc.
BL9.5 T·m calc.
EBP66 — sealed or ported calc.
Sensitivity, 1 W / 1 m84.3 dB calc.

General

Size8″
Voice coils4 Ω
RMS power200 W

Mounting dimensions

Ø8 3/4″cutout Ø7 5/8″mounting depth 4 1/2″magnet Ø≈ 4 15/16″
Cutout diameter7 5/8″
Mounting depth4 1/2″
Overall diameter8 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 Morel 8″ models