Quantum Audio Q3000/12D
12″ 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) | Tight and punchy · 0.80 |
|---|---|
| Fc | 60 Hz |
| F3 (−3 dB, no cabin gain) | 57 Hz |
| Example box (outside) | 14 3/16″ × 14 3/16″ × 13 13/16″ |
Ported
deeper, louder| Tuning (Fb) | 35 Hz |
|---|---|
| Port | slot 1 9/16 × 14 5/16″, 38 5/16″ long |
| Port velocity at 300 W | 39 ft/s |
| F3 (−3 dB, no cabin gain) | 39 Hz |
| Example box (outside) | 20 3/16″ × 15 3/4″ × 14″ |
Deeper: 2.83 ft³ (80 L) tuned to 34 Hz, 31 1/2″ × 15 3/4″ × 14 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 | 12″ |
|---|---|
| Voice coils | dual 4 Ω |
| RMS power | — |
| Fs | 42.9 Hz |
| Qts | 0.57 |
| Qes | 0.64 |
| Qms | 4.89 |
| Vas | 1.05 ft³ |
| Re (one coil) | 3.2 Ω |
|---|---|
| Sd | 72.6 in² |
| Xmax | 0.60″ |
| Vd | 43.5 in³ calc. |
| Mms | 145 g calc. |
| BL | 14 T·m calc. |
| EBP | 67 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 87.6 dB calc. |
Mounting dimensions
| Cutout diameter | 10 15/16″ |
|---|---|
| Mounting depth | 6 11/16″ |
| Overall diameter | 12 5/16″ |
Cone area (Sd) calculated from Fs, Vas and Mms: 72.7 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
- 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 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 QFW12D4 12″ · dual 4 Ω
- Quantum Audio QPW3000/12D4 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.
- Deaf Bonce Hannibal HS-1200 D2 1.20 ft³ sealed · 1.20 ft³ ported
- Machete M12 Super Sport D1 1.17 ft³ sealed · 1.20 ft³ ported
- Sundown Audio SML-12 D4 0.74 ft³ sealed · 1.24 ft³ ported
- American Bass XD-1222 1.17 ft³ sealed · 1.27 ft³ ported
- Timpano TPT-T1500-12 D4 1.13 ft³ sealed · 1.20 ft³ ported
- Sundown Audio SLD-12 D4 0.74 ft³ sealed · 1.31 ft³ ported
FAQ
What box does the Quantum Audio Q3000/12D need?
Recommended net volume: 1.06 ft³ sealed, 1.17 ft³ ported tuned to 35 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 Q3000/12D Thiele/Small specs?
Fs 42.9 Hz, Qts 0.57, Vas 1.05 ft³, Xmax 0.60″, Sd 72.6 in².
What is the Quantum Audio Q3000/12D mounting depth?
Mounting depth is 6 11/16″, cutout diameter 10 15/16″. The inside depth of the box must exceed the mounting depth by at least 1″.