Pride UFO.3 18 D1
18″ subwoofer · dual 1 Ω · 2,500 W RMS
Fs 30 HzQts 0.23Vas 2.88 ft³Xmax 1.46″
The published specs don’t add up:
- Re 3.2 Ω doesn't look like a 1 Ω coil — check the spec sheet.
Recommended box
For a sedan, one sub, 2,500 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 | 2.08 ft³ (59 L) |
|---|---|
| Qtc | 0.35 |
| Fc | 46 Hz |
| F3 (−3 dB, no cabin gain) | 116 Hz |
| Example box (outside) | 20 1/16″ × 20 1/16″ × 13 3/16″ |
Ported
| Net volume | 3.57 ft³ (101 L) |
|---|---|
| Tuning (Fb) | 28 Hz |
| Port | slot 3 3/8 × 19 7/16″, 55 9/16″ long |
| Port velocity at 2,500 W | 80 ft/s |
| F3 (−3 dB, no cabin gain) | 103 Hz |
| Example box (outside) | 31 1/2″ × 20 7/8″ × 20″ |
Thiele/Small parameters
| Fs | 30 Hz |
|---|---|
| Qts | 0.23 |
| Qes | 0.239 |
| Qms | 6 |
| Vas | 2.88 ft³ |
| Re (one coil) | 3.2 Ω |
| Sd | 186 in² |
| Xmax | 1.46″ |
| Vd | 270.9 in³ calc. |
| Mms | 704 g calc. |
| BL | 42.2 T·m calc. |
| EBP | 126 — suits ported calc. |
| Sensitivity, 1 W / 1 m | 91.6 dB calc. |
General
| Size | 18″ |
|---|---|
| Voice coils | dual 1 Ω |
| RMS power | 2,500 W |
Mounting dimensions
| Cutout diameter | 16 7/8″ |
|---|---|
| Mounting depth | 10 11/16″ |
Only Qts is published — Qms assumed to be 6 and Qes calculated (barely affects box design).
“≈” 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 Pride 18″ models
- Pride BB V.2 18 18″ · DVC
- Pride S V.3 18 D1 18″ · dual 1 Ω
- Pride S V.3 18 D2 18″ · dual 2 Ω
- Pride SS.5 18 Competition D0.7 (SS.518compD07) 18″ · dual 0.7 Ω
- Pride ST 18 D0.5 18″ · dual 0.5 Ω
- Pride T V.3 18 D1 18″ · dual 1 Ω
- Pride T V.3 18 D2 18″ · dual 2 Ω
- Pride UFO.4 18 D0.7 18″ · dual 0.7 Ω
- Pride UFO.5 18 D0.7 18″ · dual 0.7 Ω