Quantum Audio QW1000/12D4
12″ subwoofer · dual 4 Ω
| Source | web.archive.org · manufacturer data |
|---|---|
| Checked against source | October 2026 |
| Thiele/Small parameters | not in the spec sheet: Re — 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, 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 · 1.58 |
|---|---|
| Fc | 49 Hz |
| F3 (−3 dB, no cabin gain) | 35 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 9 3/8″ |
Ported
deeper, louder| Tuning (Fb) | 31 Hz |
|---|---|
| Port | slot 1 9/16 × 14 5/16″, 22 3/16″ long |
| Port velocity at 300 W | 37 ft/s |
| F3 (−3 dB, no cabin gain) | 32 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 13 1/16″ |
Deeper: 3.18 ft³ (90 L) tuned to 40 Hz, 31 1/2″ × 15 3/4″ × 15 5/16″ 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 | 28.1 Hz |
| Qts | 0.91 |
| Qes | 1.02 |
| Qms | 8.32 |
| Vas | 3.80 ft³ |
| Re (one coil) | ≈ 3.4 Ω |
|---|---|
| Sd | 81.7 in² |
| Xmax | 0.37″ |
| Vd | 30.2 in³ calc. |
| Mms | 117 g calc. |
| BL | 8.3 T·m calc. |
| EBP | 28 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 85.7 dB calc. |
Mounting dimensions
| Cutout diameter | 10 13/16″ |
|---|---|
| Mounting depth | 5 3/16″ |
| Overall diameter | 12 3/8″ |
Cone area (Sd) calculated from Fs, Vas and Mms: 81.7 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 QPW3000/12D4 12″ · dual 4 Ω
- Quantum Audio QSW12F 12″ · 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.
- Hifonics HWX12D4 (12" DVC 4ohm) 1.80 ft³ sealed · 2.33 ft³ ported
- DS18 SLC-MD12 1.80 ft³ sealed · 2.33 ft³ ported
- Soundstream SPL MULE 1.66 ft³ sealed · 2.15 ft³ ported
- Spyder Street 700 12 200W 1.73 ft³ sealed · 2.26 ft³ ported
- Spyder Street PWR 12 400W 1.73 ft³ sealed · 2.26 ft³ ported
- Kenwood KFC-XW12 1.80 ft³ sealed · 2.22 ft³ ported
FAQ
What box does the Quantum Audio QW1000/12D4 need?
Recommended net volume: 1.87 ft³ sealed, 2.40 ft³ ported tuned to 31 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 QW1000/12D4 Thiele/Small specs?
Fs 28.1 Hz, Qts 0.91, Vas 3.80 ft³, Xmax 0.37″, Sd 81.7 in².
What is the Quantum Audio QW1000/12D4 mounting depth?
Mounting depth is 5 3/16″, cutout diameter 10 13/16″. The inside depth of the box must exceed the mounting depth by at least 1″.