Morel Primo SL PSL 84 (SVC 4 ohm)
8″ subwoofer · 4 Ω · 250 W RMS
Fs 37 HzQts 0.53Vas 0.33 ft³Xmax 0.39″
Recommended box
For a sedan, one sub, 250 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 | 0.32 ft³ (9 L) |
|---|---|
| Qtc | 0.75 |
| Fc | 53 Hz |
| F3 (−3 dB, no cabin gain) | 52 Hz |
| Example box (outside) | 10 1/4″ × 10 1/4″ × 9 1/4″ |
Ported
| Net volume | 0.78 ft³ (22 L) |
|---|---|
| Tuning (Fb) | 31 Hz |
| Port | slot 1 15/16 × 14 5/16″, 96 5/8″ long |
| Port velocity at 250 W | 26 ft/s |
| F3 (−3 dB, no cabin gain) | 28 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 11 15/16″ |
The volume and tuning are the recommendation, but the port doesn’t fit this example box. Size the box and port in the designer.
Open ported box in designerThiele/Small parameters
| Fs | 37 Hz |
|---|---|
| Qts | 0.53 |
| Qes | 0.59 |
| Qms | 4.96 |
| Vas | 0.33 ft³ |
| Re | 3.6 Ω |
| Sd | 34.1 in² |
| Xmax | 0.39″ |
| Vd | 13.4 in³ calc. |
| Mms | 136 g calc. |
| BL | 13.9 T·m calc. |
| EBP | 63 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 81 dB calc. |
General
| Size | 8″ |
|---|---|
| Voice coils | 4 Ω |
| RMS power | 250 W |
Mounting dimensions
| Cutout diameter | 7 3/16″ |
|---|---|
| Mounting depth | 2 3/4″ |
| Overall diameter | 8 3/4″ |
“≈” 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
- morel.com.au/wp-content/uploads/2026/02/Primo-SL-Subwoofer-Manual-v1-Morel_0612.
- morel.com.au/primo-subwoofers/
Other Morel 8″ models
- Morel Primo 804 (SVC 4 ohm) 8″ · 4 Ω
- Morel Ultimo 802 (SVC 2 ohm) 8″ · 2 Ω
- Morel Ultimo 804 (SVC 4 ohm) 8″ · 4 Ω
- Morel Ultimo Titanium 802 (SVC 2 ohm) 8″ · 2 Ω
- Morel Ultimo Titanium 804 (SVC 4 ohm) 8″ · 4 Ω