Quantum Audio QSW12F
12″ subwoofer · 4 Ω
| Source | web.archive.org · manufacturer data |
|---|---|
| Checked against source | October 2026 |
| Thiele/Small parameters | complete |
| Mounting dimensions | 0 of 4 — missing: cutout, mounting depth, frame outer diameter, 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 | 47 Hz |
| F3 (−3 dB, no cabin gain) | 45 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 8 3/8″ |
Ported
deeper, louder| Tuning (Fb) | 30 Hz |
|---|---|
| Port | slot 1 9/16 × 14 5/16″, 24″ long |
| Port velocity at 300 W | 52 ft/s |
| F3 (−3 dB, no cabin gain) | 30 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 13 3/16″ |
Deeper: 3.14 ft³ (89 L) tuned to 31 Hz, 31 1/2″ × 15 3/4″ × 15 9/16″ 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 | 4 Ω |
| RMS power | — |
| Fs | 27.7 Hz |
| Qts | 0.47 |
| Qes | 0.5 |
| Qms | 7.13 |
| Vas | 3.15 ft³ |
| Re | 3.51 Ω |
|---|---|
| Sd | 81.1 in² |
| Xmax | 0.39″ |
| Vd | 31.6 in³ calc. |
| Mms | 144 g calc. |
| BL | 13.3 T·m calc. |
| EBP | 55 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 87.8 dB calc. |
Mounting dimensions
| Cutout diameter | ≈ 11 1/8″ |
|---|---|
| Mounting depth | ≈ 5 7/8″ |
Cone area (Sd) calculated from Fs, Vas and Mms: 81.1 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/20150905234929/http://www.quantumaudio.net/wp-content/upload
- web.archive.org/web/20130715185628/http://www.quantumaudio.net/qsw10f.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 Q3000/12D 12″ · dual 4 Ω
- Quantum Audio QFW12D4 12″ · dual 4 Ω
- Quantum Audio QPW3000/12D4 12″ · dual 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.
- Kenwood KFC-W112S 1.62 ft³ sealed · 1.34 ft³ ported
- Polk Audio MM124 (Polk/MOMO) 1.41 ft³ sealed · 2.30 ft³ ported
- Polk Audio DXi124 DVC 1.62 ft³ sealed · 2.40 ft³ ported
- Clarion WG3020 1.34 ft³ sealed · 2.40 ft³ ported
- CDT Audio HD-1200CFS 1.80 ft³ sealed · 2.33 ft³ ported
- Audiobahn AW1251X 1.48 ft³ sealed · 2.26 ft³ ported
FAQ
What box does the Quantum Audio QSW12F need?
Recommended net volume: 1.62 ft³ sealed, 2.40 ft³ ported tuned to 30 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 QSW12F Thiele/Small specs?
Fs 27.7 Hz, Qts 0.47, Vas 3.15 ft³, Xmax 0.39″, Sd 81.1 in².