DL Audio Legend 15 (1+1)

15″ subwoofer · dual 1 Ω · 3,500 W RMS

Fs 25.7 HzQts 0.59Vas 1.76 ft³

Recommended box

For a sedan, one sub, 3,500 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 volume2.08 ft³ (59 L)
Qtc0.80
Fc35 Hz
F3 (−3 dB, no cabin gain)33 Hz
Example box (outside)16 15/16″ × 16 15/16″ × 17 5/8″
Open sealed box in designer

Ported

Net volume4.80 ft³ (136 L)
Tuning (Fb)25 Hz
Portslot 5 7/8 × 16 5/16″, 77 5/8″ long
Port velocity at 3,500 W66 ft/s
F3 (−3 dB, no cabin gain)21 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 35 9/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs25.7 Hz
Qts0.59
Qes0.654
Qms6
Vas1.76 ft³
Re (one coil)≈ 0.85 Ω
Sd≈ 124 in²
Xmax≈ 0.39″
EBP39 — suits sealed calc.
Sensitivity, 1 W / 1 m83.1 dB calc.

General

Size15″
Voice coilsdual 1 Ω
RMS power3,500 W

Mounting dimensions

Ø15 1/4″cutout Ø13 7/8″mounting depth 9 7/8″magnet Ø≈ 9″
Cutout diameter13 7/8″
Mounting depth9 7/8″
Overall diameter15 1/4″

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.

Data sources

Other DL Audio 15″ models