AMP MASS 300 12D2 V.2

12″ subwoofer · dual 2 Ω · 300 W RMS

Fs 29.5 HzQts 0.53Vas 2.14 ft³Xmax 0.39″

Recommended box

For a sedan, one sub, 300 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 volume1.70 ft³ (48 L)
Qtc0.80
Fc44 Hz
F3 (−3 dB, no cabin gain)42 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 8 5/8″
Open sealed box in designer

Ported

Net volume3.07 ft³ (87 L)
Tuning (Fb)30 Hz
Portslot 1 9/16 × 14 5/16″, 17 7/8″ long
Port velocity at 300 W65 ft/s
F3 (−3 dB, no cabin gain)27 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 15 7/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs29.5 Hz
Qts0.53
Qes0.59
Qms5.58
Vas2.14 ft³
Re (one coil)≈ 1.7 Ω
Sd79.1 in²
Xmax0.39″
Vd31.1 in³ calc.
Mms177 g calc.
BL9.7 T·m calc.
EBP50 — sealed or ported calc.
Sensitivity, 1 W / 1 m86.2 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power300 W

Mounting dimensions

Ø12 11/16″cutout Ø11 1/4″mounting depth 5 7/8″magnet Ø5 11/16″
Cutout diameter11 1/4″
Mounting depth5 7/8″
Overall diameter12 11/16″
Magnet diameter5 11/16″

“≈” 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 AMP 12″ models