Timpano TPT-T2500-15 D4

15″ subwoofer · dual 4 Ω · 2,500 W RMS

35 HzFs, resonance

1.01Qts

2.37 ft³Vas

0.93″Xmax

2,500 WRMS

Source	timpanoaudio.com · manufacturer data
Checked against source	October 2026
Thiele/Small parameters	not in the spec sheet: Sd — typical value for the size used
Mounting dimensions	0 of 4 — missing: cutout, mounting depth, frame outer diameter, magnet diameter; the designer will use an estimate

Recommended box

For a sedan, one sub, 2,500 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

smaller, tighter

2.83 ft³ (80 L)

Net volume

Bass character (Qtc)	Boomy, with a bump · 1.37
Fc	47 Hz
F3 (−3 dB, no cabin gain)	35 Hz
Example box (outside)	31 1/2″ × 18 1/8″ × 11 3/4″

Open sealed box in designer

Ported

deeper, louder

1.98 ft³ (56 L)

Net volume

Tuning (Fb)	34 Hz
Port	slot 2 3/8 × 16 11/16″, 40 15/16″ long
Port velocity at 2,500 W	64 ft/s
F3 (−3 dB, no cabin gain)	35 Hz
Example box (outside)	31 1/2″ × 18 1/8″ × 12 13/16″

Open ported box in designer

Deeper: 4.80 ft³ (136 L) tuned to 36 Hz, 31 1/2″ × 18 1/8″ × 23 1/2″ outside — a bigger box with flatter deep bass. Open in the calculator

Where to buy Amazon

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

Thiele/Small parameters

Size	15″
Voice coils	dual 4 Ω
RMS power	2,500 W
Fs	35 Hz
Qts	1.01
Qes	1.14
Qms	9.05

Vas	2.37 ft³
Re (one coil)	3.8 Ω
Sd	≈ 124 in²
Xmax	0.93″
EBP	31 — suits sealed calc.
Sensitivity, 1 W / 1 m	86 dB calc.

Mounting dimensions

Cutout diameter	≈ 14″
Mounting depth	≈ 7 1/16″

“≈” 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

timpanoaudio.com/products/15-car-audio-subwoofer-2500-watts-dual-4-ohm-tpt-t2500

Other Timpano 15″ models

Timpano TPT-T1500-15 D4 15″ · dual 4 Ω
Timpano TPT-T3500-15 D2 15″ · dual 2 Ω

Similar 15″ subwoofers from other brands

Close in Fs, Qts and Vas — a box of similar volume will suit them.

DC Audio Level 3 15 D1 2.79 ft³ sealed · 1.94 ft³ ported
DC Audio Level 3 15 D2 2.79 ft³ sealed · 1.94 ft³ ported
DC Audio Level 3 15 D4 2.79 ft³ sealed · 1.94 ft³ ported
Sky High Car Audio FE-15 D4 2.79 ft³ sealed · 2.37 ft³ ported
Soundstream T5.152 2.90 ft³ sealed · 2.01 ft³ ported
Audiobahn AW151T 2.75 ft³ sealed · 2.12 ft³ ported

FAQ

What box does the Timpano TPT-T2500-15 D4 need?

Recommended net volume: 2.83 ft³ sealed, 1.98 ft³ ported tuned to 34 Hz — for one sub in a sedan at 2,500 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.

What are the Timpano TPT-T2500-15 D4 Thiele/Small specs?

Fs 35 Hz, Qts 1.01, Vas 2.37 ft³, Xmax 0.93″.

How much power does the Timpano TPT-T2500-15 D4 handle and how do I wire it?

RMS power rating: 2,500 W. Dual 4 Ω voice coils: series gives 8 Ω, parallel gives 2 Ω at the amp. Wiring for several subs and amp power — in the wiring calculator.