Sky High Car Audio BMX-15 D2
15″ subwoofer · dual 2 Ω · 2,500 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, 2,500 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) | Tight and punchy · 0.80 |
|---|---|
| Fc | 37 Hz |
| F3 (−3 dB, no cabin gain) | 35 Hz |
| Example box (outside) | 16 15/16″ × 16 15/16″ × 15 5/8″ |
Ported
deeper, louder| Tuning (Fb) | 30 Hz |
|---|---|
| Port | slot 3 3/8 × 16 5/16″, 54 1/4″ long |
| Port velocity at 2,500 W | 70 ft/s |
| F3 (−3 dB, no cabin gain) | 27 Hz |
| Example box (outside) | 31 1/2″ × 17 11/16″ × 18 1/2″ |
Deeper: 4.94 ft³ (140 L) tuned to 25 Hz, 31 1/2″ × 17 11/16″ × 30 11/16″ 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 | 15″ |
|---|---|
| Voice coils | dual 2 Ω |
| RMS power | 2,500 W |
| Fs | 21.7 Hz |
| Qts | 0.47 |
| Qes | 0.52 |
| Qms | 5.14 |
| Vas | 3.36 ft³ |
| Re (one coil) | 1.27 Ω |
|---|---|
| Sd | 127.7 in² |
| Xmax | 1.26″ |
| Vd | 160.9 in³ calc. |
| Mms | 545 g calc. |
| BL | 13.5 T·m calc. |
| EBP | 42 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 84.7 dB calc. |
Mounting dimensions
| Cutout diameter | 13 3/4″ |
|---|---|
| Mounting depth | 10 1/16″ |
| Overall diameter | 15 1/2″ |
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 15″ models
- Sky High Car Audio BMX-15 D1 15″ · dual 1 Ω
- Sky High Car Audio FE-15 D2 15″ · dual 2 Ω
- Sky High Car Audio FE-15 D4 15″ · dual 4 Ω
- Sky High Car Audio FEX-15 D2 15″ · dual 2 Ω
- Sky High Car Audio FEX-15 D4 15″ · dual 4 Ω
- Sky High Car Audio FMX-15 D1 15″ · dual 1 Ω
- Sky High Car Audio FMX-15 D2 15″ · dual 2 Ω
- Sky High Car Audio FXB-15 D2 15″ · dual 2 Ω
- Sky High Car Audio FXB-15 D4 15″ · dual 4 Ω
- Sky High Car Audio FXXL-15 D1 15″ · dual 1 Ω
- Sky High Car Audio FXXL-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.
- Alpine SWR-1542D (Type-R) 1.66 ft³ sealed · 2.83 ft³ ported
- Diamond HXP154 1.59 ft³ sealed · 2.40 ft³ ported
- URAL Decibel 15 (1+1) 1.91 ft³ sealed · 3.18 ft³ ported
- Alpine SWR-1522D (Type-R) 1.25 ft³ sealed · 2.83 ft³ ported
- Sundown Audio Xv1-15 D2 1.48 ft³ sealed · 2.58 ft³ ported
- Diamond H154 2.37 ft³ sealed · 2.93 ft³ ported
FAQ
What box does the Sky High Car Audio BMX-15 D2 need?
Recommended net volume: 1.80 ft³ sealed, 2.68 ft³ ported tuned to 30 Hz — for one sub in a sedan at 2,500 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 BMX-15 D2 Thiele/Small specs?
Fs 21.7 Hz, Qts 0.47, Vas 3.36 ft³, Xmax 1.26″, Sd 127.7 in².
What is the Sky High Car Audio BMX-15 D2 mounting depth?
Mounting depth is 10 1/16″, cutout diameter 13 3/4″. The inside depth of the box must exceed the mounting depth by at least 1″.
How much power does the Sky High Car Audio BMX-15 D2 handle and how do I wire it?
RMS power rating: 2,500 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.