Fi Audio TEAM 12 D2
12″ subwoofer · dual 2 Ω · 4,000 W RMS
The Fi Audio TEAM 12 D2 is a 12″ subwoofer. With Qts 0.36 and EBP 90 it works both sealed and ported: sealed is tighter and smaller, ported is deeper and louder. Long excursion (Xmax 1.30″) — built for loud music and high power.
| 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| Bass character (Qtc) | Dry and tight · 0.45 |
|---|---|
| Fc | 43 Hz |
| F3 (−3 dB, no cabin gain) | 78 Hz |
| Example box (outside) | 14 3/16″ × 14 3/16″ × 13 13/16″ |
Ported
deeper, louder| 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 70.1 in², which means a bigger box than this example — size it in the designer.
Open ported box in designerDeeper: 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
Projects with this subwoofer
Boxes that users designed and published: plans, cut sheet and response graph.
Thiele/Small parameters
| Size | 12″ |
|---|---|
| Voice coils | dual 2 Ω |
| RMS power | 4,000 W |
| Fs | 34.3 Hz |
| Qts | 0.36 |
| Qes | 0.38 |
| Qms | 7.83 |
| Vas | 0.61 ft³ |
| Re (one coil) | 1.49 Ω |
|---|---|
| Sd | 74.4 in² |
| Xmax | 1.30″ |
| Vd | 96.7 in³ calc. |
| Mms | 409 g calc. |
| BL | 18.6 T·m calc. |
| EBP | 90 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 84.6 dB calc. |
Mounting dimensions
| Cutout diameter | 11 1/8″ |
|---|---|
| Mounting depth | 11 1/4″ |
| Overall diameter | 12 1/2″ |
Where it fits in a vehicle
Spots from our vehicle guides where the cutout, mounting depth and recommended box fit. The spot sizes are approximate — measure your own vehicle.
- Bronco 4-door — behind the rear seat sealed and ported box
- Wrangler 4-door, hard top — behind the rear seat sealed and ported box
- Wrangler 4-door, soft top — behind the rear seat sealed and ported box
- FJ Cruiser — behind the rear seat sealed and ported box
- El Camino 1978–87 — behind the seat sealed and ported box
- Cherokee XJ — cargo area, spare moved out sealed and ported box
- Excursion — behind the third row sealed and ported box
- Challenger / Charger — trunk sealed and ported box
“≈” 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
Voice coil versions
The same sub with different voice coils: the parameters are nearly the same — pick by your amp and wiring.
| Model | Voice coils | Re | Qes | Vas | Sealed | Ported |
|---|---|---|---|---|---|---|
| Fi Audio TEAM 12 D1 | dual 1 Ω | 0.75 Ω | 0.36 | 0.61 ft³ | 1.06 ft³ | 2.19 ft³ · 34 Hz |
| Fi Audio TEAM 12 D2 | dual 2 Ω | 1.49 Ω | 0.38 | 0.61 ft³ | 1.06 ft³ | 2.19 ft³ · 34 Hz |
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.
- Sundown Audio Zv6-12 D1 1.09 ft³ sealed · 2.51 ft³ ported
- SPL Dynamics SPL-300D1A 0.81 ft³ sealed · 2.61 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
- Resilient Sounds Platinum 12 V2 D1 0.95 ft³ sealed · 2.15 ft³ ported
- Sundown Audio Xv2-12 D2 0.90 ft³ sealed · 1.13 ft³ ported
FAQ
What box does the Fi Audio TEAM 12 D2 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 D2 Thiele/Small specs?
Fs 34.3 Hz, Qts 0.36, Vas 0.61 ft³, Xmax 1.30″, Sd 74.4 in².
What is the Fi Audio TEAM 12 D2 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 D2 handle and how do I wire it?
RMS power rating: 4,000 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.
Is the Fi Audio TEAM 12 D2 better sealed or ported?
EBP 90: both work — sealed 1.06 ft³ is tighter and smaller, ported 2.19 ft³ tuned to 34 Hz is deeper and louder.
What port does the Fi Audio TEAM 12 D2 need?
For the 2.19 ft³ ported box tuned to 34 Hz: slot 4 1/8 × 14 5/16″, 56 3/16″ long, area 59.2 in²; or a round port Ø8 11/16″, ≈ 56 3/16″ long. Port air speed at 4,000 W: 97 ft/s.
What box do two Fi Audio TEAM 12 D2 subs need?
Two subs need twice the volume: 2.12 ft³ sealed, or 4.38 ft³ ported at the same 34 Hz tuning with twice the port area. One shared chamber or one per sub — whatever fits your vehicle.