Polk Audio MM1540
15″ subwoofer · 4 Ω · 425 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, 425 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) | 31 1/2″ × 17 11/16″ × 10 1/4″ |
Ported
deeper, louder| Tuning (Fb) | 30 Hz |
|---|---|
| Port | slot 1 9/16 × 16 5/16″, 22 13/16″ long |
| Port velocity at 425 W | 57 ft/s |
| F3 (−3 dB, no cabin gain) | 29 Hz |
| Example box (outside) | 31 1/2″ × 17 11/16″ × 13 5/8″ |
Deeper: 4.98 ft³ (141 L) tuned to 28 Hz, 31 1/2″ × 17 11/16″ × 21 5/16″ 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 | 15″ |
|---|---|
| Voice coils | 4 Ω |
| RMS power | 425 W |
| Fs | 27 Hz |
| Qts | 0.50 |
| Qes | 0.56 |
| Qms | 5 |
| Vas | 3.53 ft³ |
| Re | 3.25 Ω |
|---|---|
| Sd | 128.5 in² |
| Xmax | 0.98″ |
| Vd | 126.5 in³ calc. |
| Mms | 338 g calc. |
| BL | 18.2 T·m calc. |
| EBP | 48 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 87.5 dB calc. |
Mounting dimensions
| Cutout diameter | 13 7/8″ |
|---|---|
| Mounting depth | 4 5/8″ |
“≈” 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
- web.archive.org/web/20121103011346/http://www.polkaudio.com/downloads/manual/MMs
- web.archive.org/web/20101206235924/http://www.polkaudio.com/downloads/catalogs/2
Other Polk Audio 15″ models
- Polk Audio MM1540DVC 15″ · dual 4 Ω
- Polk Audio MM2154 15″ · 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 Power T1D415 2.37 ft³ sealed · 2.40 ft³ ported
- Alpine SWS-15D2 (Type-S) 2.12 ft³ sealed · 3.04 ft³ ported
- Rockford Fosgate Power T115D4 (2004) 2.19 ft³ sealed · 2.51 ft³ ported
- Soundstream T7.152 2.15 ft³ sealed · 3.00 ft³ ported
- SoundQubed HDS2.215 D2 2.90 ft³ sealed · 2.83 ft³ ported
- SoundQubed HDS2.215 D4 2.90 ft³ sealed · 2.83 ft³ ported
FAQ
What box does the Polk Audio MM1540 need?
Recommended net volume: 2.33 ft³ sealed, 2.83 ft³ ported tuned to 30 Hz — for one sub in a sedan at 425 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.
What are the Polk Audio MM1540 Thiele/Small specs?
Fs 27 Hz, Qts 0.50, Vas 3.53 ft³, Xmax 0.98″, Sd 128.5 in².
What is the Polk Audio MM1540 mounting depth?
Mounting depth is 4 5/8″, cutout diameter 13 7/8″. The inside depth of the box must exceed the mounting depth by at least 1″.
How much power does the Polk Audio MM1540 handle and how do I wire it?
RMS power rating: 425 W. Wiring for several subs and amp power — in the wiring calculator.