Quantum Audio Q2500/12D
12″ subwoofer · dual 4 Ω · 800 W RMS
| 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, 800 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 · 0.99 |
|---|---|
| Fc | 59 Hz |
| F3 (−3 dB, no cabin gain) | 48 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 8 1/2″ |
Ported
deeper, louder| Tuning (Fb) | 35 Hz |
|---|---|
| Port | slot 1 9/16 × 14 5/16″, 38 5/16″ long |
| Port velocity at 800 W | 55 ft/s |
| F3 (−3 dB, no cabin gain) | 43 Hz |
| Example box (outside) | 21 7/16″ × 15 3/4″ × 13 3/16″ |
Deeper: 2.83 ft³ (80 L) tuned to 40 Hz, 31 1/2″ × 15 3/4″ × 15 3/8″ 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 | 800 W |
| Fs | 44.2 Hz |
| Qts | 0.74 |
| Qes | 0.85 |
| Qms | 5.88 |
| Vas | 1.30 ft³ |
| Re (one coil) | 3.2 Ω |
|---|---|
| Sd | 72.7 in² |
| Xmax | 0.50″ |
| Vd | 36.4 in³ calc. |
| Mms | 110 g calc. |
| BL | 10.7 T·m calc. |
| EBP | 52 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 87.7 dB calc. |
Mounting dimensions
| Cutout diameter | 10 15/16″ |
|---|---|
| Mounting depth | 6 1/16″ |
| 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/20150906194829/http://www.quantumaudio.net/wp-content/upload
- web.archive.org/web/20130218223932/http://www.quantumaudio.net/q2500_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 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 QW1000/12D4 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.
- Pioneer TS-W311S4 1.94 ft³ sealed · 1.34 ft³ ported
- Pioneer TS-A301D4 1.73 ft³ sealed · 1.52 ft³ ported
- DL Audio Piranha 12 1.73 ft³ sealed · 1.20 ft³ ported
- Hertz Energy ES 300D.5 (DVC 4+4 ohm) 1.91 ft³ sealed · 1.34 ft³ ported
- MD.Lab SW-B12E 1.77 ft³ sealed · 1.24 ft³ ported
- American Bass HAWKSLIM-1244 1.77 ft³ sealed · 1.24 ft³ ported
FAQ
What box does the Quantum Audio Q2500/12D need?
Recommended net volume: 1.66 ft³ sealed, 1.17 ft³ ported tuned to 35 Hz — for one sub in a sedan at 800 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.
What are the Quantum Audio Q2500/12D Thiele/Small specs?
Fs 44.2 Hz, Qts 0.74, Vas 1.30 ft³, Xmax 0.50″, Sd 72.7 in².
What is the Quantum Audio Q2500/12D mounting depth?
Mounting depth is 6 1/16″, cutout diameter 10 15/16″. The inside depth of the box must exceed the mounting depth by at least 1″.
How much power does the Quantum Audio Q2500/12D handle and how do I wire it?
RMS power rating: 800 W. Dual 4 Ω voice coils: series gives 8 Ω, parallel gives 2 Ω at the amp. Wiring for several subs and amp power — in the wiring calculator.