Quantum Audio QPW3000/12D4
12″ subwoofer · dual 4 Ω · 750 W RMS
| Source | dbdrive.net · manufacturer data |
|---|---|
| Checked against source | October 2026 |
| Thiele/Small parameters | not in the spec sheet: Xmax — typical value for the size used |
| 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) | Tight and punchy · 0.81 |
|---|---|
| Fc | 42 Hz |
| F3 (−3 dB, no cabin gain) | 39 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 9 3/16″ |
Ported
deeper, louder| Tuning (Fb) | 33 Hz |
|---|---|
| Port | slot 1 9/16 × 14 5/16″, 37 3/8″ long |
| Port velocity at 750 W | 60 ft/s |
| F3 (−3 dB, no cabin gain) | 32 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 9 7/8″ |
Deeper: 3.11 ft³ (88 L) tuned to 28 Hz, 31 1/2″ × 15 3/4″ × 18″ 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 | 12″ |
|---|---|
| Voice coils | dual 4 Ω |
| RMS power | 750 W |
| Fs | 30 Hz |
| Qts | 0.58 |
| Qes | 0.654 |
| Qms | 5.48 |
| Vas | 1.70 ft³ |
| Re (one coil) | 4 Ω |
|---|---|
| Sd | 80.7 in² |
| Xmax | ≈ 0.39″ |
| Mms | 225 g calc. |
| BL | 16.1 T·m calc. |
| EBP | 46 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 85 dB calc. |
Mounting dimensions
| Cutout diameter | 11 1/4″ |
|---|---|
| Mounting depth | 6 1/2″ |
| Overall diameter | 12 13/16″ |
Cone area (Sd) calculated from Fs, Vas and Mms: 80.7 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 Quantum Audio 12″ models
- Quantum Audio Q800/12D 12″ · dual 4 Ω
- Quantum Audio Q800/12S 12″ · 4 Ω
- Quantum Audio Q2000/12D 12″ · dual 4 Ω
- Quantum Audio Q2500/12D 12″ · dual 4 Ω
- Quantum Audio Q3000/12D 12″ · dual 4 Ω
- Quantum Audio QFW12D4 12″ · dual 4 Ω
- Quantum Audio QSW12F 12″ · 4 Ω
- Quantum Audio QW1000/12D4 12″ · dual 4 Ω
- Quantum Audio QW1000/12S4 12″ · 4 Ω
- Quantum Audio QW3000/12D4 12″ · dual 4 Ω
- Quantum Audio QW5000/12D4 12″ · dual 4 Ω
- Quantum Audio QWX2000/12D4 12″ · dual 4 Ω
Similar 12″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- MTX Audio 7512-22 1.98 ft³ sealed · 2.01 ft³ ported
- American Bass XD-1222v2 1.80 ft³ sealed · 1.31 ft³ ported
- Kicker CompRT 12" 1-Ohm DVC (43CWRT121) 1.80 ft³ sealed · 1.52 ft³ ported
- Polk Audio SR124DVC 1.77 ft³ sealed · 1.48 ft³ ported
- Cerwin-Vega Mobile VPRO122D (VPRO 12" DVC 2ohm) 1.59 ft³ sealed · 1.20 ft³ ported
- Alpine R-W12D4 1.66 ft³ sealed · 1.38 ft³ ported
FAQ
What box does the Quantum Audio QPW3000/12D4 need?
Recommended net volume: 1.84 ft³ sealed, 1.34 ft³ ported tuned to 33 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 Quantum Audio QPW3000/12D4 Thiele/Small specs?
Fs 30 Hz, Qts 0.58, Vas 1.70 ft³, Sd 80.7 in².
What is the Quantum Audio QPW3000/12D4 mounting depth?
Mounting depth is 6 1/2″, cutout diameter 11 1/4″. The inside depth of the box must exceed the mounting depth by at least 1″.
How much power does the Quantum Audio QPW3000/12D4 handle and how do I wire it?
RMS power rating: 750 W. Dual 4 Ω voice coils: series gives 8 Ω, parallel gives 2 Ω at the amp. Wiring for several subs and amp power — in the wiring calculator.