Polk Audio MM1240DVC
12″ subwoofer · dual 4 Ω · 425 W RMS
| Source | web.archive.org · manufacturer data |
|---|---|
| Checked against source | October 2026 |
| Thiele/Small parameters | complete |
| Mounting dimensions | 2 of 4 — missing: frame outer diameter, magnet diameter; the designer will use an estimate |
Recommended box
For a sedan, one sub, 425 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 · 0.81 |
|---|---|
| Fc | 46 Hz |
| F3 (−3 dB, no cabin gain) | 43 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 9 3/16″ |
Ported
deeper, louder| Tuning (Fb) | 34 Hz |
|---|---|
| Port | slot 1 9/16 × 14 5/16″, 37 1/8″ long |
| Port velocity at 425 W | 45 ft/s |
| F3 (−3 dB, no cabin gain) | 34 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 9 5/8″ |
Deeper: 3.11 ft³ (88 L) tuned to 30 Hz, 31 1/2″ × 15 3/4″ × 16 3/16″ 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 | 425 W |
| Fs | 35 Hz |
| Qts | 0.61 |
| Qes | 0.7 |
| Qms | 5 |
| Vas | 1.34 ft³ |
| Re (one coil) | 3.13 Ω |
|---|---|
| Sd | 80.6 in² |
| Xmax | 0.98″ |
| Vd | 79.3 in³ calc. |
| Mms | 208 g calc. |
| BL | 14.3 T·m calc. |
| EBP | 50 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 85.7 dB calc. |
Mounting dimensions
| Cutout diameter | 11″ |
|---|---|
| Mounting depth | 4 5/8″ |
“≈” 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/20121103011346/http://www.polkaudio.com/downloads/manual/MMs
- web.archive.org/web/20101206235924/http://www.polkaudio.com/downloads/catalogs/2
Other Polk Audio 12″ models
- Polk Audio db124 12″ · 4 Ω
- Polk Audio db124DVC 12″ · dual 4 Ω
- Polk Audio db1240 12″ · 4 Ω
- Polk Audio db1240DVC 12″ · dual 4 Ω
- Polk Audio dX12-4 12″ · 4 Ω
- Polk Audio dX12-8 12″ · 8 Ω
- Polk Audio DXi124 DVC 12″ · dual 4 Ω
- Polk Audio DXi124 SVC 12″ · 4 Ω
- Polk Audio DXi1240DVC 12″ · dual 4 Ω
- Polk Audio EX12 (EX Series II) 12″ · 4 Ω
- Polk Audio GXR124 12″ · 4 Ω
- Polk Audio MM120-4 12″ · 4 Ω
Similar 12″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- Pioneer TS-SW3002S4 1.77 ft³ sealed · 1.34 ft³ ported
- Pride LP 12 D2 1.66 ft³ sealed · 1.24 ft³ ported
- BOSS Audio CH12DVC 1.73 ft³ sealed · 1.20 ft³ ported
- Sky High Car Audio FEX-12 D4 1.80 ft³ sealed · 1.27 ft³ ported
- DL Audio Raven 12 (2+2) 1.48 ft³ sealed · 1.20 ft³ ported
- American Bass DX-124 1.80 ft³ sealed · 1.27 ft³ ported
FAQ
What box does the Polk Audio MM1240DVC need?
Recommended net volume: 1.84 ft³ sealed, 1.27 ft³ ported tuned to 34 Hz — for one sub in a sedan at 425 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.
What are the Polk Audio MM1240DVC Thiele/Small specs?
Fs 35 Hz, Qts 0.61, Vas 1.34 ft³, Xmax 0.98″, Sd 80.6 in².
What is the Polk Audio MM1240DVC mounting depth?
Mounting depth is 4 5/8″, cutout diameter 11″. The inside depth of the box must exceed the mounting depth by at least 1″.
How much power does the Polk Audio MM1240DVC handle and how do I wire it?
RMS power rating: 425 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.