Timpano TPT-T2500-12 D4

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

39 HzFs, resonance

0.83Qts

0.93 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

1.73 ft³ (49 L)

Net volume

Bass character (Qtc)	Boomy, with a bump · 1.03
Fc	48 Hz
F3 (−3 dB, no cabin gain)	39 Hz
Example box (outside)	31 1/2″ × 15 3/4″ × 8 3/4″

Open sealed box in designer

Ported

deeper, louder

1.20 ft³ (34 L)

Net volume

Tuning (Fb)	34 Hz
Port	slot 1 9/16 × 14 5/16″, 39 9/16″ long
Port velocity at 2,500 W	110 ft/s
F3 (−3 dB, no cabin gain)	32 Hz
Example box (outside)	31 1/2″ × 15 3/4″ × 9 1/2″

At 2,500 W this example’s port will be noisy: air speed 110 ft/s, while the limit is 82 ft/s. It stays quiet up to about 1,350 W. Full power needs a port of at least 30.2 in², which means a bigger box than this example — size it in the designer.

Open ported box in designer

Deeper: 2.93 ft³ (83 L) tuned to 32 Hz, 31 1/2″ × 15 3/4″ × 23 5/8″ 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	12″
Voice coils	dual 4 Ω
RMS power	2,500 W
Fs	39 Hz
Qts	0.83
Qes	0.916
Qms	9.1

Vas	0.93 ft³
Re (one coil)	3.6 Ω
Sd	≈ 76 in²
Xmax	0.93″
EBP	43 — suits sealed calc.
Sensitivity, 1 W / 1 m	84.3 dB calc.

Mounting dimensions

Cutout diameter	≈ 11 1/8″
Mounting depth	≈ 5 7/8″

“≈” 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/12-car-audio-subwoofer-2500-watts-dual-4-ohm-tpt-t2500

Other Timpano 12″ models

Timpano TPT-T1000-12 D4 12″ · dual 4 Ω
Timpano TPT-T1500-12 D4 12″ · dual 4 Ω
Timpano TPT-T3500-12 D2 12″ · dual 2 Ω
Timpano TPT-TSUB12 D4 12″ · dual 4 Ω

Similar 12″ subwoofers from other brands

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

Spyder Nitro 12 350W S2 1.73 ft³ sealed · 1.20 ft³ ported
Spyder Nitro 12 350W S4 1.73 ft³ sealed · 1.20 ft³ ported
DC Audio Level 3 12 D1 1.59 ft³ sealed · 1.13 ft³ ported
DC Audio Level 3 12 D2 1.59 ft³ sealed · 1.13 ft³ ported
DC Audio Level 3 12 D4 1.59 ft³ sealed · 1.13 ft³ ported
VM Audio EXW12 1.59 ft³ sealed · 1.09 ft³ ported

FAQ

What box does the Timpano TPT-T2500-12 D4 need?

Recommended net volume: 1.73 ft³ sealed, 1.20 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-T2500-12 D4 Thiele/Small specs?

Fs 39 Hz, Qts 0.83, Vas 0.93 ft³, Xmax 0.93″.

How much power does the Timpano TPT-T2500-12 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.