Spyder Street PWR 12 400W Parabolico

12″ subwoofer · 4 Ω · 400 W RMS

Fs 42 HzQts 0.85Vas 2.15 ft³
The published specs don’t add up:

Recommended box

For a sedan, one sub, 400 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 volume1.73 ft³ (49 L)
Qtc1.28
Fc63 Hz
F3 (−3 dB, no cabin gain)47 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 8 3/4″
Open sealed box in designer

Ported

Net volume2.93 ft³ (83 L)
Tuning (Fb)46 Hz
Portslot 1 3/4 × 14 5/16″, 6 3/4″ long
Port velocity at 400 W63 ft/s
F3 (−3 dB, no cabin gain)39 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 14 1/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs42 Hz
Qts0.85
Qes1.2
Qms2.93
Vas2.15 ft³
Re3.6 Ω
Sd≈ 76 in²
Xmax≈ 0.39″
EBP35 — suits sealed calc.
Sensitivity, 1 W / 1 m87.8 dB calc.

General

Size12″
Voice coils4 Ω
RMS power400 W

Mounting dimensions

Ø12 1/8″cutout Ø10 11/16″mounting depth 5 3/8″magnet Ø5 7/8″
Cutout diameter10 11/16″
Mounting depth5 3/8″
Overall diameter12 1/8″
Magnet diameter5 7/8″

“≈” 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 Spyder 12″ models