Sky High Car Audio FXXL-12 D2
12″ subwoofer · dual 2 Ω · 5,000 W RMS
| Source | skyhighcaraudio.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, 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| Bass character (Qtc) | Dry and tight · 0.59 |
|---|---|
| Fc | 43 Hz |
| F3 (−3 dB, no cabin gain) | 56 Hz |
| Example box (outside) | 14 3/16″ × 14 3/16″ × 12 5/16″ |
Ported
deeper, louder| Tuning (Fb) | 35 Hz |
|---|---|
| Port | slot 1 9/16 × 14 5/16″, 39 5/8″ long |
| Port velocity at 5,000 W | 190 ft/s |
| F3 (−3 dB, no cabin gain) | 31 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 9 1/4″ |
At 5,000 W this example’s port will be noisy: air speed 190 ft/s, while the limit is 82 ft/s. It stays quiet up to about 930 W. Full power needs a port of at least 52.2 in², which means a bigger box than this example — size it in the designer.
The volume and tuning are the recommendation, but the port doesn’t fit this example box. Size the box and port in the designer.
Open ported box in designerDeeper: 1.34 ft³ (38 L) tuned to 28 Hz, 18 1/4″ × 15 3/4″ × 12 3/16″ 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 | 5,000 W |
| Fs | 32.9 Hz |
| Qts | 0.44 |
| Qes | 0.489 |
| Qms | 4.94 |
| Vas | 0.67 ft³ |
| Re (one coil) | 1.31 Ω |
|---|---|
| Sd | 70.9 in² |
| Xmax | 1.42″ |
| Vd | 100.5 in³ calc. |
| Mms | 364 g calc. |
| BL | 14.2 T·m calc. |
| EBP | 67 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 83.4 dB calc. |
Mounting dimensions
| Cutout diameter | 11 1/8″ |
|---|---|
| Mounting depth | 9 3/4″ |
| Overall diameter | 12 13/16″ |
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
Other Sky High Car Audio 12″ models
- Sky High Car Audio BMX-12 D1 12″ · dual 1 Ω
- Sky High Car Audio BMX-12 D2 12″ · dual 2 Ω
- Sky High Car Audio FE-12 D2 12″ · dual 2 Ω
- Sky High Car Audio FE-12 D4 12″ · dual 4 Ω
- Sky High Car Audio FEX-12 D2 12″ · dual 2 Ω
- Sky High Car Audio FEX-12 D4 12″ · dual 4 Ω
- Sky High Car Audio FMX-12 D1 12″ · dual 1 Ω
- Sky High Car Audio FMX-12 D2 12″ · dual 2 Ω
- Sky High Car Audio FXB-12 D2 12″ · dual 2 Ω
- Sky High Car Audio FXB-12 D4 12″ · dual 4 Ω
- Sky High Car Audio FXXL-12 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.
- Phoenix Gold ELITE2.12D2 (Elite 2, DVC 2 ohm) 0.71 ft³ sealed · 1.27 ft³ ported
- American Bass VFLCOMP-1222 0.95 ft³ sealed · 1.34 ft³ ported
- Memphis Car Audio MJ1212 (MOJO 12", 1ohm setting) 0.79 ft³ sealed · 1.20 ft³ ported
- Sundown Audio Zv5-12 D1 1.06 ft³ sealed · 1.06 ft³ ported
- Ascendant Audio Havoc 12 D1 0.67 ft³ sealed · 1.20 ft³ ported
- Fi Audio NEO 4.7 12 D1 0.94 ft³ sealed · 1.20 ft³ ported
FAQ
What box does the Sky High Car Audio FXXL-12 D2 need?
Recommended net volume: 0.92 ft³ sealed, 1.13 ft³ ported tuned to 35 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 Sky High Car Audio FXXL-12 D2 Thiele/Small specs?
Fs 32.9 Hz, Qts 0.44, Vas 0.67 ft³, Xmax 1.42″, Sd 70.9 in².
What is the Sky High Car Audio FXXL-12 D2 mounting depth?
Mounting depth is 9 3/4″, 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 Sky High Car Audio FXXL-12 D2 handle and how do I wire it?
RMS power rating: 5,000 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.