Polk Audio MM2154
15″ 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 · 0.85 |
|---|---|
| Fc | 44 Hz |
| F3 (−3 dB, no cabin gain) | 40 Hz |
| Example box (outside) | 31 1/2″ × 17 11/16″ × 12 1/8″ |
Ported
deeper, louder| Tuning (Fb) | 30 Hz |
|---|---|
| Port | slot 1 9/16 × 16 5/16″, 16 3/16″ long |
| Port velocity at 300 W | 54 ft/s |
| F3 (−3 dB, no cabin gain) | 30 Hz |
| Example box (outside) | 31 1/2″ × 17 11/16″ × 16 3/8″ |
Deeper: 4.87 ft³ (138 L) tuned to 31 Hz, 31 1/2″ × 17 11/16″ × 20 1/8″ 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 | 15″ |
|---|---|
| Voice coils | 4 Ω |
| RMS power | — |
| Fs | 24 Hz |
| Qts | 0.47 |
| Qes | 0.49 |
| Qms | 10.21 |
| Vas | 6.60 ft³ |
| Re | 3.5 Ω |
|---|---|
| Sd | 126.2 in² |
| Xmax | 0.37″ |
| Vd | 47.2 in³ calc. |
| Mms | 221 g calc. |
| BL | 15.4 T·m calc. |
| EBP | 49 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 89.2 dB calc. |
Mounting dimensions
| Cutout diameter | 13 15/16″ |
|---|---|
| Mounting depth | 7 3/8″ |
“≈” 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
Other Polk Audio 15″ models
- Polk Audio MM1540 15″ · 4 Ω
- Polk Audio MM1540DVC 15″ · dual 4 Ω
- Polk Audio MM2154 DVC 15″ · dual 4 Ω
Similar 15″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- Rockford Fosgate Punch HX2 RFD1215 (2000) 2.83 ft³ sealed · 3.67 ft³ ported
- Diamond D315D2 3.07 ft³ sealed · 3.99 ft³ ported
- Diamond M3151 2.65 ft³ sealed · 3.81 ft³ ported
- JL Audio 15W3v2-D2 2.90 ft³ sealed · 3.78 ft³ ported
- PowerBass M-1504 2.75 ft³ sealed · 3.57 ft³ ported
- JBL GTO1514D 2.93 ft³ sealed · 3.81 ft³ ported
FAQ
What box does the Polk Audio MM2154 need?
Recommended net volume: 2.86 ft³ sealed, 3.74 ft³ ported tuned to 30 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 MM2154 Thiele/Small specs?
Fs 24 Hz, Qts 0.47, Vas 6.60 ft³, Xmax 0.37″, Sd 126.2 in².
What is the Polk Audio MM2154 mounting depth?
Mounting depth is 7 3/8″, cutout diameter 13 15/16″. The inside depth of the box must exceed the mounting depth by at least 1″.