User manual POLK AUDIO MM120

[. . . ] This laser imaging research enables us to view the entire vibrating surface of a driver or tweeter, allowing us to observe the resonances which develop on speaker cones as they move. These resonances are the root cause of frequency response distortions. As an x-ray enables a physician to discover the root cause of a symptom and thereby prescribe the right treatment for a cure, this laser imaging technique allows Polk engineers to find the right combination of high-tech materials, geometry and construction techniques to tune out the offending resonances. The benefit of Dynamic Balance is the dramatic improvement in the sound quality of our speakers, which every listener can appreciate. [. . . ] Whichever you choose, we recommend that its minimum thickness be 3/4". This will provide the rigidity necessary for optimum performance. If you've never built an enclosure before we are going to try to make this as easy and painless as possible. If you've built enclosures before you can skip this section and go right to the technical sheet to get your parameters. Complete Parts List: 1. Wood (particle board, MDF, or marine grade plywood) 4' x 8' x 3/4" sheet 2. Caulk gun and silicon caulk (two tubes) 5. Terminal cup (one per speaker) available at electronic parts stores 6. Grills to protect your subwoofers (optional) 9. Solderless speaker connectors (available at electronic parts stores) 10. Fill material (Dacron pillow stuffing) 1" = 25. 4 mm Multiply your usable Width x Height x Depth. The product will be the usable (internal) volume of your enclosure in cubic inches. Divide this number by 1728 (the number of cubic inches in a cubic foot). This will give you the internal volume in cubic feet. Divide your internal cubic feet by 2 (only if you are using a pair of Polk/MOMO subwoofers). Compare this number to the chart at the bottom of the technical sheet. Choose the recommended enclosure which is closest in size or that fits your desired type of enclosure. Now that you have all of your needed dimensions, you can begin cutting your wood. From the above chart you can tell how big each piece of wood should be. Here's a sample enclosure: Hole diameter MM100 = 9. 30 MM120 = 11. 16 151/2" 14" Designing Your Polk Polk/MOMO Subwoofer Enclosure Step By Step When designing your subwoofer enclosure, the first thing you need to figure out is, just how large an enclosure will fit in your vehicle. When an enclosure is going in the trunk of a car, you first need to measure your trunk to find the maximum height, width, and depth you can use. Pay attention to trunk hinges and tension bars. If your enclosure is going in an area other than a trunk, make sure you check for similar obstructions. [. . . ] This Warranty gives you specific legal rights which may vary from state to state. This warranty applies only to Products purchased in the United States of America, its possessions, and U. S. and NATO armed forces exchanges and audio clubs. The Warranty terms and conditions applicable to Products purchased in other countries are available from the Polk Audio Authorized Distributors in such countries. MM120-4 20 - 200 Hz 87 dB 4 3. 7 500 W 1000 W 30 Hz 8. 06 0. 50 0. 47 61 L 2. 15 ft3 164 µm/N 15. 5 TM . 0514 m2 . 553 ft2 25. 4 mm 1. 00 in. [. . . ]