Fi Audio TEAM 12 D1

12″ subwoofer · dual 1 Ω · 4,000 W RMS

34.3 HzFs, resonance

0.34Qts

0.61 ft³Vas

1.30″Xmax

4,000 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, 4,000 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

1.06 ft³ (30 L)

Net volume

Bass character (Qtc)	Dry and tight · 0.43
Fc	43 Hz
F3 (−3 dB, no cabin gain)	83 Hz
Example box (outside)	14 3/16″ × 14 3/16″ × 13 13/16″

Open sealed box in designer

Ported

deeper, louder

2.19 ft³ (62 L)

Net volume

Tuning (Fb)	34 Hz
Port	slot 4 1/8 × 14 5/16″, 56 3/16″ long
Port velocity at 4,000 W	97 ft/s
F3 (−3 dB, no cabin gain)	30 Hz
Example box (outside)	26 1/8″ × 15 3/4″ × 23 1/4″

At 4,000 W this example’s port will be noisy: air speed 97 ft/s, while the limit is 82 ft/s. It stays quiet up to about 2,850 W. Full power needs a port of at least 70 in², which means a bigger box than this example — size it in the designer.

Open ported box in designer

Deeper: 1.41 ft³ (40 L) tuned to 27 Hz, 31 1/2″ × 15 3/4″ × 13″ 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 1 Ω
RMS power	4,000 W
Fs	34.3 Hz
Qts	0.34
Qes	0.36
Qms	7.93
Vas	0.61 ft³

Re (one coil)	0.75 Ω
Sd	74.4 in²
Xmax	1.30″
Vd	96.7 in³ calc.
Mms	409 g calc.
BL	13.6 T·m calc.
EBP	95 — sealed or ported calc.
Sensitivity, 1 W / 1 m	84.8 dB calc.

Mounting dimensions

Cutout diameter	11 1/8″
Mounting depth	11 1/4″
Overall diameter	12 1/2″

“≈” 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

web.archive.org/web/20151202050949/http://www.ficaraudio.com:80/product/team-ser

Other Fi Audio 12″ models

Fi Audio Alpha 12 S2 12″ · 2 Ω
Fi Audio Alpha 12 S4 12″ · 4 Ω
Fi Audio Alpha v1 12 S1 12″ · 1 Ω
Fi Audio Alpha v1 12 S2 12″ · 2 Ω
Fi Audio Alpha v1 12 S4 12″ · 4 Ω
Fi Audio Alpha v2 12 S2 12″ · 2 Ω
Fi Audio Alpha v2 12 S4 12″ · 4 Ω
Fi Audio Alpha v2.1 12 S2 12″ · 2 Ω
Fi Audio Alpha v2.1 12 S4 12″ · 4 Ω
Fi Audio BL-NEO 12 D1 12″ · dual 1 Ω
Fi Audio BL-NEO 12 D2 12″ · dual 2 Ω
Fi Audio BL12 D1 12″ · dual 1 Ω

Similar 12″ subwoofers from other brands

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

SPL Dynamics SPL-300D1A 0.81 ft³ sealed · 2.61 ft³ ported
Sundown Audio Zv6-12 D1 1.09 ft³ sealed · 2.51 ft³ ported
Sundown Audio Zv6-12 D2 1.09 ft³ sealed · 2.51 ft³ ported
American Bass VFLCOMP-1211 0.95 ft³ sealed · 1.24 ft³ ported
Sundown Audio Xv2-12 D2 0.90 ft³ sealed · 1.13 ft³ ported
Avatar Doomsday 12 D1 0.92 ft³ sealed · 2.26 ft³ ported

FAQ

What box does the Fi Audio TEAM 12 D1 need?

Recommended net volume: 1.06 ft³ sealed, 2.19 ft³ ported tuned to 34 Hz — for one sub in a sedan at 4,000 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.

What are the Fi Audio TEAM 12 D1 Thiele/Small specs?

Fs 34.3 Hz, Qts 0.34, Vas 0.61 ft³, Xmax 1.30″, Sd 74.4 in².

What is the Fi Audio TEAM 12 D1 mounting depth?

Mounting depth is 11 1/4″, cutout diameter 11 1/8″. The inside depth of the box must exceed the mounting depth by at least 1″.

How much power does the Fi Audio TEAM 12 D1 handle and how do I wire it?

RMS power rating: 4,000 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.