Mac Audio Maximus Reference 12 (DVC)

12″ subwoofer · dual 2.5 Ω · 1,000 W RMS

Fs 21 HzQts 0.44Vas 3.00 ft³Xmax 1.02″

Recommended box

For a sedan, one sub, 1,000 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 volume	1.31 ft³ (37 L)
Qtc	0.80
Fc	38 Hz
F3 (−3 dB, no cabin gain)	36 Hz
Example box (outside)	14 3/16″ × 14 3/16″ × 16 7/16″

Open sealed box in designer

Ported

Net volume	2.93 ft³ (83 L)
Tuning (Fb)	25 Hz
Port	slot 2 9/16 × 14 5/16″, 48 1/2″ long
Port velocity at 1,000 W	65 ft/s
F3 (−3 dB, no cabin gain)	23 Hz
Example box (outside)	31 1/2″ × 15 3/4″ × 18 5/8″

Open ported box in designer

Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs	21 Hz
Qts	0.44
Qes	0.475
Qms	6
Vas	3.00 ft³
Re (one coil)	≈ 2.13 Ω
Sd	≈ 76 in²
Xmax	1.02″
EBP	44 — suits sealed calc.
Sensitivity, 1 W / 1 m	84.2 dB calc.

General

Size	12″
Voice coils	dual 2.5 Ω
RMS power	1,000 W

Mounting dimensions

Cutout diameter	11 1/8″
Mounting depth	7 15/16″
Overall diameter	12 5/16″

Only Qts is published — Qms assumed to be 6 and Qes calculated (barely affects box design).

“≈” 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.