Fi Audio Xv5 12 D2
12″ subwoofer · dual 2 Ω · 1,500 W RMS
The Fi Audio Xv5 12 D2 is a 12″ subwoofer. With Qts 0.39 and EBP 86 it works both sealed and ported: sealed is tighter and smaller, ported is deeper and louder. Long excursion (Xmax 0.91″) — built for loud music and high power.
| Source | ficaraudio.com · 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, 1,500 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| Bass character (Qtc) | Dry and tight · 0.54 |
|---|---|
| Fc | 50 Hz |
| F3 (−3 dB, no cabin gain) | 72 Hz |
| Example box (outside) | 14 3/16″ × 14 3/16″ × 9 11/16″ |
Ported
deeper, louder| Tuning (Fb) | 35 Hz |
|---|---|
| Port | slot 3 3/4 × 14 5/16″, 50 1/16″ long |
| Port velocity at 1,500 W | 64 ft/s |
| F3 (−3 dB, no cabin gain) | 31 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 17 5/16″ |
Deeper: 1.34 ft³ (38 L) tuned to 29 Hz, 25 1/8″ × 15 3/4″ × 9 5/8″ 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 | 1,500 W |
| Fs | 36.3 Hz |
| Qts | 0.39 |
| Qes | 0.424 |
| Qms | 4.8 |
| Vas | 0.62 ft³ |
| Re (one coil) | 1.86 Ω |
|---|---|
| Sd | 70.9 in² |
| Xmax | 0.91″ |
| Vd | 64.2 in³ calc. |
| Mms | 324 g calc. |
| BL | 18 T·m calc. |
| EBP | 86 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 85 dB calc. |
Mounting dimensions
| Cutout diameter | 11″ |
|---|---|
| Mounting depth | 7 1/8″ |
| 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
- Silverado / Sierra Crew Cab — under 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
- Mustang 2015–2023 coupe — trunk sealed and ported box
- Challenger / Charger — trunk sealed and ported box
- Club Car Precedent — under the rear seat sealed box
Judging by its value, the published Re is for both coils in series — converted to per coil.
“≈” 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 Xv5 12 D1 | dual 1 Ω | 1 Ω | 0.649 | 0.43 ft³ | 0.67 ft³ | 1.13 ft³ · 35 Hz |
| Fi Audio Xv5 12 D2 | dual 2 Ω | 1.86 Ω | 0.424 | 0.62 ft³ | 0.67 ft³ | 2.08 ft³ · 35 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 Xv2-12 D2 0.90 ft³ sealed · 1.13 ft³ ported
- American Bass VFLCOMP-1211 0.95 ft³ sealed · 1.24 ft³ ported
- Swat EXE-12D2 0.67 ft³ sealed · 1.17 ft³ ported
- Kicker Solo-Baric L7XS 12" 1-Ohm DVC (52L7XS121) 0.95 ft³ sealed · 1.55 ft³ ported
- SPL Dynamics SPL-300D1A 0.81 ft³ sealed · 2.61 ft³ ported
- Sundown Audio SAv3-12 D4 0.78 ft³ sealed · 1.77 ft³ ported
FAQ
What box does the Fi Audio Xv5 12 D2 need?
Recommended net volume: 0.67 ft³ sealed, 2.08 ft³ ported tuned to 35 Hz — for one sub in a sedan at 1,500 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.
What are the Fi Audio Xv5 12 D2 Thiele/Small specs?
Fs 36.3 Hz, Qts 0.39, Vas 0.62 ft³, Xmax 0.91″, Sd 70.9 in².
What is the Fi Audio Xv5 12 D2 mounting depth?
Mounting depth is 7 1/8″, cutout diameter 11″. The inside depth of the box must exceed the mounting depth by at least 1″.
How much power does the Fi Audio Xv5 12 D2 handle and how do I wire it?
RMS power rating: 1,500 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.
Is the Fi Audio Xv5 12 D2 better sealed or ported?
EBP 86: both work — sealed 0.67 ft³ is tighter and smaller, ported 2.08 ft³ tuned to 35 Hz is deeper and louder.
What port does the Fi Audio Xv5 12 D2 need?
For the 2.08 ft³ ported box tuned to 35 Hz: slot 3 3/4 × 14 5/16″, 50 1/16″ long, area 53.6 in²; or a round port Ø8 1/4″, ≈ 50 1/16″ long. Port air speed at 1,500 W: 64 ft/s.
What box do two Fi Audio Xv5 12 D2 subs need?
Two subs need twice the volume: 1.34 ft³ sealed, or 4.17 ft³ ported at the same 35 Hz tuning with twice the port area. One shared chamber or one per sub — whatever fits your vehicle.