Brax Matrix ML8 Sub (2x2 Ohm)

8″ subwoofer · dual 2 Ω · 400 W RMS

Fs 32 HzQts 0.56Vas 0.78 ft³Xmax 0.36″

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 volume0.78 ft³ (22 L)
Qtc0.80
Fc45 Hz
F3 (−3 dB, no cabin gain)43 Hz
Example box (outside)10 5/8″ × 10 5/8″ × 17 15/16″
Open sealed box in designer

Ported

Net volume1.31 ft³ (37 L)
Tuning (Fb)31 Hz
Port2 round ports Ø3″, 27 3/4″ long
Port velocity at 400 W83 ft/s
F3 (−3 dB, no cabin gain)27 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 7 15/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs32 Hz
Qts0.56
Qes0.6
Qms9.63
Vas0.78 ft³
Re (one coil)1.9 Ω
Sd33.9 in²
Xmax0.36″
Vd12.3 in³ calc.
Mms76 g calc.
BL7 T·m calc.
EBP53 — sealed or ported calc.
Sensitivity, 1 W / 1 m82.8 dB calc.

General

Size8″
Voice coilsdual 2 Ω
RMS power400 W

Mounting dimensions

Ø8 3/4″cutout Ø7 1/2″mounting depth 3 3/4″magnet Ø5 1/2″
Cutout diameter7 1/2″
Mounting depth3 3/4″
Overall diameter8 3/4″
Magnet diameter5 1/2″

“≈” 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