Dynahertz H115 D4

15″ subwoofer · dual 4 Ω

Fs 32.5 HzQts 0.83Vas 5.05 ft³

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 volume2.90 ft³ (82 L)
Qtc1.38
Fc54 Hz
F3 (−3 dB, no cabin gain)40 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 12″
Open sealed box in designer

Ported

Net volume4.91 ft³ (139 L)
Tuning (Fb)41 Hz
Portslot 1 3/4 × 16 11/16″, 5 1/16″ long
Port velocity at 300 W61 ft/s
F3 (−3 dB, no cabin gain)35 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 19 1/4″
Open ported box in designer
2030405060801001502007278849096102HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs32.5 Hz
Qts0.83
Qes0.96
Qms6.19
Vas5.05 ft³
Re (one coil)3.35 Ω
Sd127 in²
Xmax≈ 0.39″
Mms160 g calc.
BL10.7 T·m calc.
EBP34 — suits sealed calc.
Sensitivity, 1 W / 1 m89.1 dB calc.

General

Size15″
Voice coilsdual 4 Ω
RMS power—

Mounting dimensions

Ø≈ 15 3/16″cutout ≈ Ø14″mounting depth ≈ 7 1/16″magnet Ø≈ 9 1/16″
Cutout diameter≈ 14″
Mounting depth≈ 7 1/16″

Judging by its value, the published Re is for both coils in series — converted to per coil.

“≈” 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 Dynahertz 15″ models