Polk Audio MM2084 DVC
8″ subwoofer · dual 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 · 0.81 |
|---|---|
| Fc | 58 Hz |
| F3 (−3 dB, no cabin gain) | 54 Hz |
| Example box (outside) | 10 1/4″ × 10 1/4″ × 19 7/16″ |
Ported
deeper, louder| Tuning (Fb) | 41 Hz |
|---|---|
| Port | round port Ø2 1/2″, 12 3/16″ long |
| Port velocity at 300 W | 124 ft/s |
| F3 (−3 dB, no cabin gain) | 43 Hz |
| Example box (outside) | 16 1/16″ × 15 3/4″ × 6 11/16″ |
At 300 W this example’s port will be noisy: air speed 124 ft/s, while the limit is 82 ft/s. It stays quiet up to about 130 W. Full power needs a port of at least 7.5 in², which means a bigger box than this example — size it in the designer.
Open ported box in designerDeeper: 1.34 ft³ (38 L) tuned to 37 Hz, 31 1/2″ × 15 3/4″ × 9″ 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 | 8″ |
|---|---|
| Voice coils | dual 4 Ω |
| RMS power | — |
| Fs | 43 Hz |
| Qts | 0.60 |
| Qes | 0.66 |
| Qms | 6.8 |
| Vas | 0.62 ft³ |
| Re (one coil) | 3.25 Ω |
|---|---|
| Sd | 34.7 in² |
| Xmax | 0.30″ |
| Vd | 10.3 in³ calc. |
| Mms | 55 g calc. |
| BL | 8.6 T·m calc. |
| EBP | 65 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 85.3 dB calc. |
Mounting dimensions
| Cutout diameter | 7 1/16″ |
|---|---|
| Mounting depth | 4 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 8″ models
- Polk Audio db804 8″ · 4 Ω
- Polk Audio db804DVC 8″ · dual 4 Ω
- Polk Audio db840 8″ · 4 Ω
- Polk Audio db840DVC 8″ · dual 4 Ω
- Polk Audio dX8-4 8″ · 4 Ω
- Polk Audio dX8-8 8″ · 8 Ω
- Polk Audio DXi804 DVC 8″ · dual 4 Ω
- Polk Audio DXi804 SVC 8″ · 4 Ω
- Polk Audio EX8 (EX Series II) 8″ · 4 Ω
- Polk Audio MM840 8″ · 4 Ω
- Polk Audio MM840DVC 8″ · dual 4 Ω
- Polk Audio MM2084 8″ · 4 Ω
Similar 8″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- Morel Ultimo Titanium 802 (SVC 2 ohm) 0.85 ft³ sealed · 0.64 ft³ ported
- Kicker Comp 8" 4-Ohm SVC (43C84) 0.57 ft³ sealed · 0.53 ft³ ported
- Focal Utopia Be 21 WX (SVC 4 ohm) 0.74 ft³ sealed · 0.53 ft³ ported
- JL Audio 8W7AE-3 0.88 ft³ sealed · 1.02 ft³ ported
- Kicker CompC 8" 4-Ohm SVC (44CWCS84) 0.71 ft³ sealed · 0.92 ft³ ported
- Ground Zero GZIW 200X-II (4 Ohm) 0.42 ft³ sealed · 0.49 ft³ ported
FAQ
What box does the Polk Audio MM2084 DVC need?
Recommended net volume: 0.78 ft³ sealed, 0.57 ft³ ported tuned to 41 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 MM2084 DVC Thiele/Small specs?
Fs 43 Hz, Qts 0.60, Vas 0.62 ft³, Xmax 0.30″, Sd 34.7 in².
What is the Polk Audio MM2084 DVC mounting depth?
Mounting depth is 4 1/4″, cutout diameter 7 1/16″. The inside depth of the box must exceed the mounting depth by at least 1″.