Quantum Audio Q3000/15D
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 · 1.08 |
|---|---|
| Fc | 45 Hz |
| F3 (−3 dB, no cabin gain) | 35 Hz |
| Example box (outside) | 31 1/2″ × 17 11/16″ × 11 3/4″ |
Ported
deeper, louder| Tuning (Fb) | 32 Hz |
|---|---|
| Port | slot 1 9/16 × 16 5/16″, 19 1/4″ long |
| Port velocity at 300 W | 43 ft/s |
| F3 (−3 dB, no cabin gain) | 31 Hz |
| Example box (outside) | 31 1/2″ × 17 11/16″ × 13 1/2″ |
Deeper: 4.70 ft³ (133 L) tuned to 33 Hz, 31 1/2″ × 17 11/16″ × 19 7/16″ 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 | 29.4 Hz |
| Qts | 0.71 |
| Qes | 0.81 |
| Qms | 6.09 |
| Vas | 3.58 ft³ |
| Re (one coil) | 3.2 Ω |
|---|---|
| Sd | 121.1 in² |
| Xmax | 0.60″ |
| Vd | 72.5 in³ calc. |
| Mms | 250 g calc. |
| BL | 13.5 T·m calc. |
| EBP | 36 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 87 dB calc. |
Mounting dimensions
| Cutout diameter | 13 13/16″ |
|---|---|
| Mounting depth | 8 1/16″ |
| Overall diameter | 15 3/8″ |
Cone area (Sd) calculated from Fs, Vas and Mms: 121.1 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
- web.archive.org/web/20150905113038/http://www.quantumaudio.net/wp-content/upload
- web.archive.org/web/20130622070207/http://www.quantumaudio.net/q3000_12d.html
Other Quantum Audio 15″ models
- Quantum Audio Q2000/15D 15″ · dual 4 Ω
- Quantum Audio Q2500/15D 15″ · dual 4 Ω
- Quantum Audio QW3000/15D4 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.
- Dayton Audio UM15-22 2.86 ft³ sealed · 2.90 ft³ ported
- Dayton Audio UMII15-22 2.79 ft³ sealed · 2.72 ft³ ported
- Pride LP 15 D2 2.90 ft³ sealed · 2.58 ft³ ported
- Soundstream PWS-15 2.83 ft³ sealed · 3.32 ft³ ported
- Cerwin-Vega Mobile Stroker PRO 15 (15" DVC 2ohm) 2.83 ft³ sealed · 3.00 ft³ ported
- CT Sounds BIO-15 D2 2.90 ft³ sealed · 2.51 ft³ ported
FAQ
What box does the Quantum Audio Q3000/15D need?
Recommended net volume: 2.75 ft³ sealed, 2.86 ft³ ported tuned to 32 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 Q3000/15D Thiele/Small specs?
Fs 29.4 Hz, Qts 0.71, Vas 3.58 ft³, Xmax 0.60″, Sd 121.1 in².
What is the Quantum Audio Q3000/15D mounting depth?
Mounting depth is 8 1/16″, cutout diameter 13 13/16″. The inside depth of the box must exceed the mounting depth by at least 1″.