Polk Audio GXR124
12″ subwoofer · 4 Ω · 165 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, 165 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 · 0.89 |
|---|---|
| Fc | 49 Hz |
| F3 (−3 dB, no cabin gain) | 43 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 9 3/8″ |
Ported
deeper, louder| Tuning (Fb) | 30 Hz |
|---|---|
| Port | slot 1 9/16 × 14 5/16″, 23 9/16″ long |
| Port velocity at 165 W | 34 ft/s |
| F3 (−3 dB, no cabin gain) | 33 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 13 5/16″ |
Deeper: 3.18 ft³ (90 L) tuned to 34 Hz, 31 1/2″ × 15 3/4″ × 15 1/2″ 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 | 165 W |
| Fs | 25.9 Hz |
| Qts | 0.47 |
| Qes | 0.5 |
| Qms | 7.75 |
| Vas | 4.83 ft³ |
| Re | 3.81 Ω |
|---|---|
| Sd | 82.3 in² |
| Xmax | 0.24″ |
| Vd | 19.8 in³ calc. |
| Mms | 110 g calc. |
| BL | 11.7 T·m calc. |
| EBP | 52 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 88.8 dB calc. |
Mounting dimensions
| Cutout diameter | 11″ |
|---|---|
| Mounting depth | 5 1/4″ |
“≈” 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 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.
- Audiobahn AWC12X 1.73 ft³ sealed · 2.26 ft³ ported
- Mac Audio Ice Cube 12 1.73 ft³ sealed · 2.26 ft³ ported
- Audiobahn AW1251 1.73 ft³ sealed · 2.26 ft³ ported
- Orion Cobalt 12 SVC (1999) 1.77 ft³ sealed · 2.30 ft³ ported
- Kenwood KFC-PS3016W 1.91 ft³ sealed · 1.80 ft³ ported
- Rockford Fosgate Punch HX2 RFD1212 (2000) 1.31 ft³ sealed · 2.26 ft³ ported
FAQ
What box does the Polk Audio GXR124 need?
Recommended net volume: 1.87 ft³ sealed, 2.44 ft³ ported tuned to 30 Hz — for one sub in a sedan at 165 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.
What are the Polk Audio GXR124 Thiele/Small specs?
Fs 25.9 Hz, Qts 0.47, Vas 4.83 ft³, Xmax 0.24″, Sd 82.3 in².
What is the Polk Audio GXR124 mounting depth?
Mounting depth is 5 1/4″, 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 GXR124 handle and how do I wire it?
RMS power rating: 165 W. Wiring for several subs and amp power — in the wiring calculator.