Polk Audio db124
12″ subwoofer · 4 Ω · 360 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, 360 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 | 57 Hz |
| F3 (−3 dB, no cabin gain) | 54 Hz |
| Example box (outside) | 14 3/16″ × 14 3/16″ × 12 11/16″ |
Ported
deeper, louder| Tuning (Fb) | 34 Hz |
|---|---|
| Port | slot 1 9/16 × 14 5/16″, 25 5/8″ long |
| Port velocity at 360 W | 54 ft/s |
| F3 (−3 dB, no cabin gain) | 34 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 10 3/4″ |
Deeper: 3.07 ft³ (87 L) tuned to 30 Hz, 31 1/2″ × 15 3/4″ × 16 1/16″ 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 | 360 W |
| Fs | 31 Hz |
| Qts | 0.44 |
| Qes | 0.47 |
| Qms | 6.1 |
| Vas | 2.22 ft³ |
| Re | 3.25 Ω |
|---|---|
| Sd | 80.6 in² |
| Xmax | 0.30″ |
| Vd | 23.8 in³ calc. |
| Mms | 161 g calc. |
| BL | 14.7 T·m calc. |
| EBP | 66 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 88 dB calc. |
Mounting dimensions
| Cutout diameter | 11″ |
|---|---|
| Mounting depth | 6″ |
“≈” 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/20050302095619/http://www.polkaudio.com:80/downloads/manuals
- web.archive.org/web/20121103010421/http://www.polkaudio.com/downloads/manual/DBS
Other Polk Audio 12″ models
- 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
- Polk Audio MM124 (Polk/MOMO) 12″ · 4 Ω
Similar 12″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- Gladen RS-X 12 (SVC 4 ohm) 1.02 ft³ sealed · 1.80 ft³ ported
- American Bass TM-1244 1.02 ft³ sealed · 1.91 ft³ ported
- Audioque SDC2.012 D4 1.09 ft³ sealed · 1.91 ft³ ported
- American Bass TM-1222 0.95 ft³ sealed · 1.84 ft³ ported
- Magnum MBW 12-22SF 0.74 ft³ sealed · 1.66 ft³ ported
- Magnum MBW 12-24SF 0.74 ft³ sealed · 1.66 ft³ ported
FAQ
What box does the Polk Audio db124 need?
Recommended net volume: 0.95 ft³ sealed, 1.77 ft³ ported tuned to 34 Hz — for one sub in a sedan at 360 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.
What are the Polk Audio db124 Thiele/Small specs?
Fs 31 Hz, Qts 0.44, Vas 2.22 ft³, Xmax 0.30″, Sd 80.6 in².
What is the Polk Audio db124 mounting depth?
Mounting depth is 6″, 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 db124 handle and how do I wire it?
RMS power rating: 360 W. Wiring for several subs and amp power — in the wiring calculator.