Audio System X 15-1100
15″ subwoofer · dual 4 Ω · 1,100 W RMS
Fs 29 HzQts 0.56Vas 1.48 ft³Xmax 0.61″
The published specs don’t add up:
- Fs, Vas and Sd don't match the moving mass of 235 g (they give 549 g) — one of the spec sheet values is probably wrong.
Recommended box
For a sedan, one sub, 1,100 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
| Net volume | 1.38 ft³ (39 L) |
|---|---|
| Qtc | 0.80 |
| Fc | 42 Hz |
| F3 (−3 dB, no cabin gain) | 39 Hz |
| Example box (outside) | 17 5/16″ × 17 5/16″ × 12″ |
Ported
| Net volume | 4.10 ft³ (116 L) |
|---|---|
| Tuning (Fb) | 25 Hz |
| Port | slot 3 1/8 × 16 11/16″, 48 7/8″ long |
| Port velocity at 1,100 W | 63 ft/s |
| F3 (−3 dB, no cabin gain) | 22 Hz |
| Example box (outside) | 31 1/2″ × 18 1/8″ × 22 1/8″ |
Thiele/Small parameters
| Fs | 29 Hz |
|---|---|
| Qts | 0.56 |
| Qes | 0.61 |
| Qms | 6.2 |
| Vas | 1.48 ft³ |
| Re (one coil) | 3.3 Ω |
| Sd | 114 in² |
| Xmax | 0.61″ |
| Vd | 69.5 in³ calc. |
| Mms | 549 g calc. |
| BL | 23.3 T·m calc. |
| EBP | 48 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 84.3 dB calc. |
General
| Size | 15″ |
|---|---|
| Voice coils | dual 4 Ω |
| RMS power | 1,100 W |
Mounting dimensions
| Cutout diameter | 14 3/16″ |
|---|---|
| Mounting depth | 8 9/16″ |
| Overall diameter | 15 1/4″ |
Judging by its value, the published Re is for both coils in parallel — 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 Audio System 15″ models
- Audio System H15 EVO 15″ · dual 2 Ω
- Audio System M 15 15″ · 4 Ω
- Audio System R 15 FA 15″ · 4 Ω