Audiopipe TXX-BD2W-18

18″ subwoofer · dual 4 Ω · 1,500 W RMS

Fs 28 HzQts 0.40Vas 6.00 ft³Xmax 0.28″

Recommended box

For a sedan, one sub, 1,500 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 volume1.98 ft³ (56 L)
Qtc0.80
Fc56 Hz
F3 (−3 dB, no cabin gain)54 Hz
Example box (outside)20 1/16″ × 20 1/16″ × 12 5/8″
Open sealed box in designer

Ported

Net volume6.36 ft³ (180 L)
Tuning (Fb)30 Hz
Portslot 3 3/4 × 19 7/16″, 26 15/16″ long
Port velocity at 1,500 W63 ft/s
F3 (−3 dB, no cabin gain)28 Hz
Example box (outside)31 1/2″ × 20 7/8″ × 24 13/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs28 Hz
Qts0.40
Qes0.48
Qms2.3
Vas6.00 ft³
Re (one coil)3.6 Ω
Sd173.4 in²
Xmax0.28″
Vd47.8 in³ calc.
Mms337 g calc.
BL21.1 T·m calc.
EBP58 — sealed or ported calc.
Sensitivity, 1 W / 1 m90.9 dB calc.

General

Size18″
Voice coilsdual 4 Ω
RMS power1,500 W

Mounting dimensions

Ø18 11/16″cutout Ø16 15/16″mounting depth 9 1/16″magnet Ø≈ 11″
Cutout diameter16 15/16″
Mounting depth9 1/16″
Overall diameter18 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