Treo RSX 12.44
12″ subwoofer · dual 4 Ω · 350 W RMS
Fs 33.6 HzQts 0.85Vas 1.43 ft³Xmax 1.14″
The published specs don’t add up:
- The published Xmax 1.14″ looks like max (mechanical) excursion, not linear: the excursion-limited power will read too high.
Recommended box
For a sedan, one sub, 350 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 | 1.73 ft³ (49 L) |
|---|---|
| Qtc | 1.15 |
| Fc | 45 Hz |
| F3 (−3 dB, no cabin gain) | 35 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 8 3/4″ |
Ported
| Net volume | 2.93 ft³ (83 L) |
|---|---|
| Tuning (Fb) | 33 Hz |
| Port | slot 1 3/4 × 14 5/16″, 17 1/8″ long |
| Port velocity at 350 W | 60 ft/s |
| F3 (−3 dB, no cabin gain) | 27 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 14 7/8″ |
Thiele/Small parameters
| Fs | 33.6 Hz |
|---|---|
| Qts | 0.85 |
| Qes | 1.067 |
| Qms | 4.25 |
| Vas | 1.43 ft³ |
| Re (one coil) | 3.6 Ω |
| Sd | 76.1 in² |
| Xmax | 1.14″ |
| Vd | 86.9 in³ calc. |
| Mms | 190 g calc. |
| BL | 11.6 T·m calc. |
| EBP | 31 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 83.6 dB calc. |
General
| Size | 12″ |
|---|---|
| Voice coils | dual 4 Ω |
| RMS power | 350 W |
Mounting dimensions
| Cutout diameter | 11″ |
|---|---|
| Mounting depth | 5 1/2″ |
| Overall diameter | 12 5/16″ |
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 Treo 12″ models
- Treo RSX 12.22 12″ · dual 2 Ω
- Treo SS12.22 12″ · dual 2 Ω