SPL Dynamics XTR-250D2
10″ subwoofer · dual 2 Ω · 750 W RMS
| Source | web.archive.org · 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, 750 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 · 0.50 |
|---|---|
| Fc | 52 Hz |
| F3 (−3 dB, no cabin gain) | 84 Hz |
| Example box (outside) | 12 3/16″ × 12 3/16″ × 9 3/16″ |
Ported
deeper, louder| Tuning (Fb) | 37 Hz |
|---|---|
| Port | slot 2 3/8 × 14 5/16″, 39 3/4″ long |
| Port velocity at 750 W | 61 ft/s |
| F3 (−3 dB, no cabin gain) | 33 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 11 7/16″ |
Deeper: 0.95 ft³ (27 L) tuned to 38 Hz, 21 3/16″ × 15 3/4″ × 8 7/16″ 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 | 10″ |
|---|---|
| Voice coils | dual 2 Ω |
| RMS power | 750 W |
| Fs | 33.5 Hz |
| Qts | 0.32 |
| Qes | 0.355 |
| Qms | 3.14 |
| Vas | 0.65 ft³ |
| Re (one coil) | 1.7 Ω |
|---|---|
| Sd | 50.4 in² |
| Xmax | 0.39″ |
| Vd | 19.9 in³ calc. |
| Mms | 184 g calc. |
| BL | 13.6 T·m calc. |
| EBP | 94 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 84.9 dB calc. |
Mounting dimensions
| Cutout diameter | 9 3/16″ |
|---|---|
| Mounting depth | 6 1/16″ |
| Overall diameter | 10 13/16″ |
Cone area (Sd) calculated from Fs, Vas and Mms: 50.4 in².
“≈” 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 SPL Dynamics 10″ models
- SPL Dynamics PRO-10D2 MK3 10″ · dual 2 Ω
- SPL Dynamics PRO-10D2 MK4 10″ · dual 2 Ω
- SPL Dynamics PRO-10D4 MK3 10″ · dual 4 Ω
- SPL Dynamics PRO-10D4 MK4 10″ · dual 4 Ω
- SPL Dynamics PRO-250D2 10″ · dual 2 Ω
- SPL Dynamics SW-250D2 10″ · dual 2 Ω
- SPL Dynamics V-10S 10″ · 4 Ω
- SPL Dynamics V-10S4 10″ · 4 Ω
- SPL Dynamics V-250D2 10″ · dual 2 Ω
- SPL Dynamics V-250D4 10″ · dual 4 Ω
- SPL Dynamics V-250S4 10″ · 4 Ω
- SPL Dynamics XTR-250D4 10″ · dual 4 Ω
Similar 10″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- URAL Bulava 10 (2+2) 0.46 ft³ sealed · 1.52 ft³ ported
- Massive Audio SUMMO104 0.55 ft³ sealed · 1.52 ft³ ported
- SoundQubed HDS2.210 D2 0.51 ft³ sealed · 1.52 ft³ ported
- SoundQubed HDS2.210 D4 0.51 ft³ sealed · 1.52 ft³ ported
- Sundown Audio Ev4-10 D2 0.46 ft³ sealed · 1.02 ft³ ported
- Sundown Audio Ev4-10 D4 0.46 ft³ sealed · 1.02 ft³ ported
FAQ
What box does the SPL Dynamics XTR-250D2 need?
Recommended net volume: 0.46 ft³ sealed, 1.48 ft³ ported tuned to 37 Hz — for one sub in a sedan at 750 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.
What are the SPL Dynamics XTR-250D2 Thiele/Small specs?
Fs 33.5 Hz, Qts 0.32, Vas 0.65 ft³, Xmax 0.39″, Sd 50.4 in².
What is the SPL Dynamics XTR-250D2 mounting depth?
Mounting depth is 6 1/16″, cutout diameter 9 3/16″. The inside depth of the box must exceed the mounting depth by at least 1″.
How much power does the SPL Dynamics XTR-250D2 handle and how do I wire it?
RMS power rating: 750 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.