Polk Audio SR124
12″ subwoofer · 4 Ω · 700 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, 700 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 | 43 Hz |
| F3 (−3 dB, no cabin gain) | 41 Hz |
| Example box (outside) | 14 3/16″ × 14 3/16″ × 18 11/16″ |
Ported
deeper, louder| Tuning (Fb) | 32 Hz |
|---|---|
| Port | slot 1 9/16 × 14 5/16″, 35 13/16″ long |
| Port velocity at 700 W | 61 ft/s |
| F3 (−3 dB, no cabin gain) | 32 Hz |
| Example box (outside) | 21 9/16″ × 15 3/4″ × 14 3/4″ |
Deeper: 3.00 ft³ (85 L) tuned to 28 Hz, 31 1/2″ × 15 3/4″ × 17 11/16″ 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 | 700 W |
| Fs | 29 Hz |
| Qts | 0.54 |
| Qes | 0.58 |
| Qms | 6.9 |
| Vas | 1.87 ft³ |
| Re | 3.5 Ω |
|---|---|
| Sd | 77.3 in² |
| Xmax | 0.64″ |
| Vd | 49.6 in³ calc. |
| Mms | 200 g calc. |
| BL | 14.8 T·m calc. |
| EBP | 50 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 85.5 dB calc. |
Mounting dimensions
| Cutout diameter | 11″ |
|---|---|
| Mounting depth | 7 5/8″ |
| Overall diameter | 12 7/16″ |
“≈” 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.
- Clarion SW3011 1.48 ft³ sealed · 1.41 ft³ ported
- Rockford Fosgate Power T1D212 1.45 ft³ sealed · 1.59 ft³ ported
- JBL GT5-12 1.87 ft³ sealed · 1.52 ft³ ported
- AMP MASS 300 12D2 V.2 1.70 ft³ sealed · 1.70 ft³ ported
- Elemental Designs e12O.14 1.17 ft³ sealed · 1.55 ft³ ported
- Elemental Designs e12O.44 1.17 ft³ sealed · 1.55 ft³ ported
FAQ
What box does the Polk Audio SR124 need?
Recommended net volume: 1.52 ft³ sealed, 1.48 ft³ ported tuned to 32 Hz — for one sub in a sedan at 700 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.
What are the Polk Audio SR124 Thiele/Small specs?
Fs 29 Hz, Qts 0.54, Vas 1.87 ft³, Xmax 0.64″, Sd 77.3 in².
What is the Polk Audio SR124 mounting depth?
Mounting depth is 7 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 SR124 handle and how do I wire it?
RMS power rating: 700 W. Wiring for several subs and amp power — in the wiring calculator.