Quantum Audio QW3000/15D4
15″ subwoofer · dual 4 Ω
| Source | web.archive.org · manufacturer data |
|---|---|
| Checked against source | October 2026 |
| Thiele/Small parameters | complete |
| Mounting dimensions | 3 of 4 — missing: magnet diameter; the designer will use an estimate |
Recommended box
For a sedan, one sub, 300 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) | Boomy, with a bump · 0.95 |
|---|---|
| Fc | 44 Hz |
| F3 (−3 dB, no cabin gain) | 37 Hz |
| Example box (outside) | 31 1/2″ × 17 11/16″ × 12 3/8″ |
Ported
deeper, louder| Tuning (Fb) | 34 Hz |
|---|---|
| Port | slot 1 9/16 × 16 5/16″, 21 11/16″ long |
| Port velocity at 300 W | 38 ft/s |
| F3 (−3 dB, no cabin gain) | 33 Hz |
| Example box (outside) | 31 1/2″ × 17 11/16″ × 11 11/16″ |
Deeper: 4.98 ft³ (141 L) tuned to 31 Hz, 31 1/2″ × 17 11/16″ × 20 1/2″ 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 | 15″ |
|---|---|
| Voice coils | dual 4 Ω |
| RMS power | — |
| Fs | 31.2 Hz |
| Qts | 0.68 |
| Qes | 0.92 |
| Qms | 2.6 |
| Vas | 2.85 ft³ |
| Re (one coil) | 3.4 Ω |
|---|---|
| Sd | 128.7 in² |
| Xmax | 0.60″ |
| Vd | 77 in³ calc. |
| Mms | 316 g calc. |
| BL | 15.1 T·m calc. |
| EBP | 34 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 86.2 dB calc. |
Mounting dimensions
| Cutout diameter | 13 5/8″ |
|---|---|
| Mounting depth | 8″ |
| Overall diameter | 15 3/8″ |
Cone area (Sd) calculated from Fs, Vas and Mms: 128.7 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 15″ models
- Quantum Audio Q2000/15D 15″ · dual 4 Ω
- Quantum Audio Q2500/15D 15″ · dual 4 Ω
- Quantum Audio Q3000/15D 15″ · dual 4 Ω
- Quantum Audio QW5000/15D4 15″ · dual 4 Ω
- Quantum Audio QWX4000/15D4 15″ · dual 4 Ω
Similar 15″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- Memphis Car Audio MJP1544 (MOJO Pro 15" DVC 4ohm) 2.93 ft³ sealed · 2.33 ft³ ported
- Diamond CM315D4 2.79 ft³ sealed · 2.33 ft³ ported
- Memphis Car Audio M71512 (M7 15", 1ohm setting) 3.11 ft³ sealed · 2.30 ft³ ported
- Cerwin-Vega Mobile VMAX154 (VMAX 15" DVC 4ohm) 2.83 ft³ sealed · 1.80 ft³ ported
- DC Audio Level 3 M3 15 D1 2.90 ft³ sealed · 2.40 ft³ ported
- DC Audio Level 3 M3 15 D2 2.90 ft³ sealed · 2.40 ft³ ported
FAQ
What box does the Quantum Audio QW3000/15D4 need?
Recommended net volume: 2.93 ft³ sealed, 2.30 ft³ ported tuned to 34 Hz — for one sub in a sedan at 300 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.
What are the Quantum Audio QW3000/15D4 Thiele/Small specs?
Fs 31.2 Hz, Qts 0.68, Vas 2.85 ft³, Xmax 0.60″, Sd 128.7 in².
What is the Quantum Audio QW3000/15D4 mounting depth?
Mounting depth is 8″, cutout diameter 13 5/8″. The inside depth of the box must exceed the mounting depth by at least 1″.