Stereo Integrity SQL 15 D2
15″ subwoofer · dual 2 Ω · 1,000 W RMS
Fs 29.4 HzQts 0.59Vas 2.62 ft³Xmax 1.02″
Recommended box
For a sedan, one sub, 1,000 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
| Net volume | 2.90 ft³ (82 L) |
|---|---|
| Qtc | 0.81 |
| Fc | 41 Hz |
| F3 (−3 dB, no cabin gain) | 38 Hz |
| Example box (outside) | 31 1/2″ × 18 1/8″ × 12″ |
Ported
| Net volume | 4.94 ft³ (140 L) |
|---|---|
| Tuning (Fb) | 28 Hz |
| Port | slot 3 1/8 × 16 11/16″, 30 1/4″ long |
| Port velocity at 1,000 W | 65 ft/s |
| F3 (−3 dB, no cabin gain) | 24 Hz |
| Example box (outside) | 31 1/2″ × 18 1/8″ × 22 3/4″ |
Thiele/Small parameters
| Fs | 29.4 Hz |
|---|---|
| Qts | 0.59 |
| Qes | 0.66 |
| Qms | 5.43 |
| Vas | 2.62 ft³ |
| Re (one coil) | 2 Ω |
| Sd | 127.6 in² |
| Xmax | 1.02″ |
| Vd | 130.6 in³ calc. |
| Mms | 379 g calc. |
| BL | 14.6 T·m calc. |
| EBP | 45 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 86.6 dB calc. |
General
| Size | 15″ |
|---|---|
| Voice coils | dual 2 Ω |
| RMS power | 1,000 W |
Mounting dimensions
| Cutout diameter | 14 3/16″ |
|---|---|
| Mounting depth | 7 3/8″ |
| Overall diameter | 15 9/16″ |
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.