User manual POLK AUDIO MM2104

[. . . ] However, damage to loudspeakers can occur when an amplifier, regardless of its wattage, is made to play at higher listening levels than its power can clearly produce. This is usually beyond the "12 or 1 o'clock" position on the volume control. Operation at this level can result in very high levels of audible distortion originating in the amplifier, which can add a harsh, gritty sound to your listening material. Contrary to popular belief, a speaker is more likely to be damaged by trying to get too much volume from a low-powered amplifier or receiver than from a high-powered one. [. . . ] If your goal was perfectly flat frequency response you would design your cabinet for this particular car to have a resonance frequency of 100 Hz. Since most people want more bass than a flat frequency response yields, tuning the cabinet at a lower frequency, say 50 Hz, would give you a gain of 12 dB per octave between 100 and 50 Hz and flat response from 50 Hz down. The larger the cabinet, the lower the resonant frequency, and the lower the efficiency. Tools You Will Need To Build Your Enclosure If you have decided to build your own enclosure for your Polk/MOMO subwoofers, here is a list of the tools you should have available to you. Parts You Will Need To Build Your Enclosure When building a subwoofer enclosure you will find that there are numerous materials recommended for construction. Particle board (the smaller the particles the better) These materials range in price as well as availability. Particle board is the most common, least costly, and can be purchased at most hardware stores. MDF and marine grade plywood, although preferable, are usually much harder to find, and much more costly. Whichever you choose, we recommend that its minimum thickness be 3/4". 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. Wood (particle board, MDF, or marine grade plywood) 4' x 8' x 3/4" sheet 2. Terminal cup (one per speaker) available at electronic parts stores 6. Designing Your 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. If your enclosure is going in an area other than a trunk, make sure you check for similar obstructions. This compensates for the thickness of the material you use (simply double the thickness, i. : if you're using 3/4" material, subtract 1 1/2"; 1" material, subtract 2", etc), and will give you your usable (internal) dimensions. Since we will be using a pair of MM2124 subwoofers, for our sample enclosure, we now need to determine the center divider displacement. This can be figured out by multiplying the height x depth x thickness of the divider (in our enclosure the thickness of the divider will be the same as the rest of our enclosure, 3/4") and subtracting that number from the total usable cubic inches. After you have cut all of the wood, it's time to start assembling your enclosure. Before you assemble your enclosure there are a few things we recommend doing. [. . . ] All implied warranties on this Product are limited to the duration of this expressed Warranty. Some states do not allow limitation on how long an implied Warranty lasts, so the above limitations may not apply to you. This Warranty gives you specific legal rights, and you also may have other rights which vary from state to state. This Warranty applies only to Products purchased in Canada, the United States of America, its possessions, and U. [. . . ]