Ascendant Audio SMD V2 15 D1

15″ subwoofer · dual 1 Ω · 5,000 W RMS

35.5 HzFs, resonance

0.27Qts

1.11 ft³Vas

1.38″Xmax

5,000 WRMS

Source	web.archive.org · manufacturer data
Checked against source	October 2026
Thiele/Small parameters	complete
Mounting dimensions	3 of 4 — missing: magnet diameter; the designer will use an estimate

Recommended box

For a sedan, one sub, 5,000 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

2.07 ft³ (58.5 L)

Net volume

Bass character (Qtc)	Dry and tight · 0.33
Fc	44 Hz
F3 (−3 dB, no cabin gain)	120 Hz
Example box (outside)	17 5/16″ × 17 5/16″ × 16 3/4″

Open sealed box in designer

Ported

deeper, louder

3.71 ft³ (105 L)

Net volume

Tuning (Fb)	34 Hz
Port	slot 5 7/8 × 16 11/16″, 53 1/4″ long
Port velocity at 5,000 W	84 ft/s
F3 (−3 dB, no cabin gain)	96 Hz
Example box (outside)	31 1/2″ × 18 1/8″ × 26 1/16″

At 5,000 W this example’s port will be noisy: air speed 84 ft/s, while the limit is 82 ft/s. It stays quiet up to about 4,750 W. Full power needs a port of at least 100.7 in², which means a bigger box than this example — size it in the designer.

Open ported box in designer

Deeper: 2.40 ft³ (68 L) tuned to 27 Hz, 22 13/16″ × 18 1/8″ × 21 7/16″ 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 1 Ω
RMS power	5,000 W
Fs	35.5 Hz
Qts	0.27
Qes	0.28
Qms	5.92
Vas	1.11 ft³

Re (one coil)	0.7 Ω
Sd	125.6 in²
Xmax	1.38″
Vd	173 in³ calc.
Mms	594 g calc.
BL	18.2 T·m calc.
EBP	127 — suits ported calc.
Sensitivity, 1 W / 1 m	89 dB calc.

Mounting dimensions

Cutout diameter	14 1/8″
Mounting depth	14 1/4″
Overall diameter	15 5/8″

“≈” 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

Other Ascendant Audio 15″ models

Ascendant Audio Chaos 15 D1 15″ · dual 1 Ω
Ascendant Audio Chaos 15 D2 15″ · dual 2 Ω
Ascendant Audio Havoc 15 D1 15″ · dual 1 Ω
Ascendant Audio Havoc 15 D2 15″ · dual 2 Ω
Ascendant Audio Mayhem 15 D1 15″ · dual 1 Ω
Ascendant Audio Mayhem 15 D2 15″ · dual 2 Ω
Ascendant Audio SMD Signature 15 D1 15″ · dual 1 Ω
Ascendant Audio SMD Signature 15 D2 15″ · dual 2 Ω
Ascendant Audio SMD V2 15 D2 15″ · dual 2 Ω
Ascendant Audio TEAM 15 D1 15″ · dual 1 Ω
Ascendant Audio TEAM 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.

Fi Audio OMEGA 15 D1 1.66 ft³ sealed · 3.71 ft³ ported
Fi Audio OMEGA 15 D2 1.66 ft³ sealed · 3.71 ft³ ported
Ground Zero GZPW 15SPL (1x2 Ohm) 1.54 ft³ sealed · 2.47 ft³ ported
Sundown Audio NSv4-15 D1 1.82 ft³ sealed · 3.35 ft³ ported
Audioque HDC415-D1-A 1.17 ft³ sealed · 3.18 ft³ ported
Sundown Audio NSv4-15 D2 1.82 ft³ sealed · 3.35 ft³ ported

FAQ

What box does the Ascendant Audio SMD V2 15 D1 need?

Recommended net volume: 2.07 ft³ sealed, 3.71 ft³ ported tuned to 34 Hz — for one sub in a sedan at 5,000 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.

What are the Ascendant Audio SMD V2 15 D1 Thiele/Small specs?

Fs 35.5 Hz, Qts 0.27, Vas 1.11 ft³, Xmax 1.38″, Sd 125.6 in².

What is the Ascendant Audio SMD V2 15 D1 mounting depth?

Mounting depth is 14 1/4″, cutout diameter 14 1/8″. The inside depth of the box must exceed the mounting depth by at least 1″.

How much power does the Ascendant Audio SMD V2 15 D1 handle and how do I wire it?

RMS power rating: 5,000 W. Dual 1 Ω voice coils: series gives 2 Ω, parallel gives 0.5 Ω at the amp. Wiring for several subs and amp power — in the wiring calculator.