Polk Audio MM2124
12″ subwoofer · 4 Ω
| 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, 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 | 48 Hz |
| F3 (−3 dB, no cabin gain) | 45 Hz |
| Example box (outside) | 14 3/16″ × 14 3/16″ × 19 13/16″ |
Ported
deeper, louder| Tuning (Fb) | 34 Hz |
|---|---|
| Port | slot 1 9/16 × 14 5/16″, 25 1/16″ long |
| Port velocity at 300 W | 48 ft/s |
| F3 (−3 dB, no cabin gain) | 33 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 10 7/8″ |
Deeper: 3.11 ft³ (88 L) tuned to 32 Hz, 31 1/2″ × 15 3/4″ × 15 5/8″ 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 | 4 Ω |
| RMS power | — |
| Fs | 31 Hz |
| Qts | 0.52 |
| Qes | 0.54 |
| Qms | 13.66 |
| Vas | 2.25 ft³ |
| Re | 3.3 Ω |
|---|---|
| Sd | 80.4 in² |
| Xmax | 0.37″ |
| Vd | 30.1 in³ calc. |
| Mms | 158 g calc. |
| BL | 13.7 T·m calc. |
| EBP | 57 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 87.5 dB calc. |
Mounting dimensions
| Cutout diameter | 11″ |
|---|---|
| Mounting depth | 6 9/16″ |
“≈” 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 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.
- Focal Performance Sub P 30 (SVC 4 ohm) 1.52 ft³ sealed · 1.80 ft³ ported
- PowerBass S-1204D 1.45 ft³ sealed · 1.84 ft³ ported
- BOSS Audio P126DVC 1.73 ft³ sealed · 1.98 ft³ ported
- JBL Club 1224 (SSI set to 2 ohm) 1.62 ft³ sealed · 1.73 ft³ ported
- SPL Dynamics V-300D2 1.59 ft³ sealed · 1.91 ft³ ported
- Morel Primo 124 (SVC 4 ohm) 1.52 ft³ sealed · 1.70 ft³ ported
FAQ
What box does the Polk Audio MM2124 need?
Recommended net volume: 1.62 ft³ sealed, 1.80 ft³ ported tuned to 34 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 Polk Audio MM2124 Thiele/Small specs?
Fs 31 Hz, Qts 0.52, Vas 2.25 ft³, Xmax 0.37″, Sd 80.4 in².
What is the Polk Audio MM2124 mounting depth?
Mounting depth is 6 9/16″, cutout diameter 11″. The inside depth of the box must exceed the mounting depth by at least 1″.