Morel Ultimo 804 (SVC 4 ohm)
8″ subwoofer · 4 Ω · 800 W RMS
Fs 40 HzQts 0.40Vas 0.69 ft³Xmax 0.49″
The published specs don’t add up:
- Fs, Vas and Sd don't match the moving mass of 95 g (they give 68 g) — one of the spec sheet values is probably wrong.
Recommended box
For a sedan, one sub, 800 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 | 0.35 ft³ (10 L) |
|---|---|
| Qtc | 0.69 |
| Fc | 69 Hz |
| F3 (−3 dB, no cabin gain) | 74 Hz |
| Example box (outside) | 11″ × 11″ × 8 11/16″ |
Ported
| Net volume | 0.74 ft³ (21 L) |
|---|---|
| Tuning (Fb) | 41 Hz |
| Port | round port Ø3″, 12 7/8″ long |
| Port velocity at 800 W | 176 ft/s |
| F3 (−3 dB, no cabin gain) | 40 Hz |
| Example box (outside) | 18 9/16″ × 15 3/4″ × 7 5/16″ |
Thiele/Small parameters
| Fs | 40 Hz |
|---|---|
| Qts | 0.40 |
| Qes | 0.55 |
| Qms | 1.48 |
| Vas | 0.69 ft³ |
| Re | 3.7 Ω |
| Sd | 37.7 in² |
| Xmax | 0.49″ |
| Vd | 18.5 in³ calc. |
| Mms | 68 g calc. |
| BL | 10.7 T·m calc. |
| EBP | 73 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 85.6 dB calc. |
General
| Size | 8″ |
|---|---|
| Voice coils | 4 Ω |
| RMS power | 800 W |
Mounting dimensions
| Cutout diameter | 7 15/16″ |
|---|---|
| Mounting depth | 4 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
Other Morel 8″ models
- Morel Primo 804 (SVC 4 ohm) 8″ · 4 Ω
- Morel Primo SL PSL 84 (SVC 4 ohm) 8″ · 4 Ω
- Morel Ultimo 802 (SVC 2 ohm) 8″ · 2 Ω
- Morel Ultimo Titanium 802 (SVC 2 ohm) 8″ · 2 Ω
- Morel Ultimo Titanium 804 (SVC 4 ohm) 8″ · 4 Ω