Timpano TPT-T3500-15 D2

15″ subwoofer · dual 2 Ω · 3,500 W RMS

30 HzFs, resonance

0.50Qts

2.67 ft³Vas

1.14″Xmax

3,500 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, 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

smaller, tighter

1.66 ft³ (47 L)

Net volume

Bass character (Qtc)	Tight and punchy · 0.80
Fc	48 Hz
F3 (−3 dB, no cabin gain)	46 Hz
Example box (outside)	17 5/16″ × 17 5/16″ × 13 15/16″

Open sealed box in designer

Ported

deeper, louder

2.15 ft³ (61 L)

Net volume

Tuning (Fb)	33 Hz
Port	slot 2 15/16 × 16 11/16″, 50 3/8″ long
Port velocity at 3,500 W	82 ft/s
F3 (−3 dB, no cabin gain)	32 Hz
Example box (outside)	25 1/16″ × 18 1/8″ × 19 1/8″

At 3,500 W this example’s port will be noisy: air speed 82 ft/s, while the limit is 82 ft/s. It stays quiet up to about 3,450 W. Full power needs a port of at least 49.4 in², which means a bigger box than this example — size it in the designer.

Open ported box in designer

Deeper: 4.80 ft³ (136 L) tuned to 28 Hz, 31 1/2″ × 18 1/8″ × 31 11/16″ 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 2 Ω
RMS power	3,500 W
Fs	30 Hz
Qts	0.50
Qes	0.52
Qms	11.14

Vas	2.67 ft³
Re (one coil)	1.4 Ω
Sd	≈ 124 in²
Xmax	1.14″
EBP	58 — sealed or ported calc.
Sensitivity, 1 W / 1 m	87.9 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/tpt-t3500-15_d2-powerful-15-inch-car-audio-subwoofer

Other Timpano 15″ models

Timpano TPT-T1500-15 D4 15″ · dual 4 Ω
Timpano TPT-T2500-15 D4 15″ · dual 4 Ω

Similar 15″ subwoofers from other brands

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

B2 Audio HN15v3 D1 1.45 ft³ sealed · 2.05 ft³ ported
Kicker CompQ 15" 2-Ohm DVC (42CWQ152) 1.45 ft³ sealed · 2.01 ft³ ported
Fi Audio NEO 3.5 15 D2 1.59 ft³ sealed · 2.12 ft³ ported
Fi Audio NEO 3.5 15 D1 1.59 ft³ sealed · 2.12 ft³ ported
Cerwin-Vega Mobile VMAX152 (VMAX 15" DVC 2ohm) 2.01 ft³ sealed · 1.80 ft³ ported
Sundown Audio Ev4-15 D2 1.45 ft³ sealed · 3.00 ft³ ported

FAQ

What box does the Timpano TPT-T3500-15 D2 need?

Recommended net volume: 1.66 ft³ sealed, 2.15 ft³ ported tuned to 33 Hz — for one sub in a sedan at 3,500 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.

What are the Timpano TPT-T3500-15 D2 Thiele/Small specs?

Fs 30 Hz, Qts 0.50, Vas 2.67 ft³, Xmax 1.14″.

How much power does the Timpano TPT-T3500-15 D2 handle and how do I wire it?

RMS power rating: 3,500 W. Dual 2 Ω voice coils: series gives 4 Ω, parallel gives 1 Ω at the amp. Wiring for several subs and amp power — in the wiring calculator.