User manual POLK AUDIO MM12

[. . . ] Connecting Your Polk/MOMO Custom Enclosed Subwoofers The push terminal connectors are located on the underside of the Custom Enclosure. Because of this placement, it is best to use a bare wire or pin connection. For a bare wire connection, strip 1/2 inch (12. 7mm) of insulation from each of the two conductors of your wire to expose the bare metal and twist each of the conductors into a single unfrayed strand (so you have two unfrayed strands). Note that one of the terminals on the enclosure is red (+) and the other is black (-). [. . . ] The installer must be careful when drilling into the car structure not to damage any important elements (fuel lines, electrical conduits, you know; stuff like that). Polk Audio takes no responsibility for damage done to car structures when securing this product. If you are at all uncertain about the best and safest way to install your subwoofer enclosure, consult your local Polk Audio dealer or professional installer. Break It In Your Polk/MOMO Custom Enclosed Subwoofer will achieve even greater performance once it is thoroughly broken-in. To break in your new custom enclosed sub, play 20 to 30 hours of music at moderate levels. Get more information online at Polk University: http://www. polkaudio. com/car/faqad/index. php Amplifier Power Requirements For Polk/MOMO Custom Enclosed Subwoofers With one subwoofer we recommend an amplifier with a power rating of at least 200Watts (x 1 in bridged mode) to sufficiently drive this woofer. If you have a noisy car or intend to play your system at loud listening levels, more power is necessary to achieve the best performance. Optimal Crossover Setting We recommend using an active crossover with a 12 to 18dB per octave low pass filter slope, and setting it to an initial setting of 80 to 90 Hz as a good starting point. This is an optimal crossover setting on most vehicles. 4 POLK/MOMO: CHAMPIONSHIP PERFORMANCE Inverting Phase Depending on the placement of your custom enclosure and associated components, it may be necessary to invert the phase of one or another of your system's connections in order to gain better subwoofer/mid-range blending. Inverting the phase simply means switching the positive connections with the negative connections at the amplifier. If you choose to do this, invert the phase of only one set of speakers (either your mains, or your subs, never both). Safe Limits Of Operation Your Polk/MOMO Custom Enclosed Subwoofer is made with the highest quality materials for years of trouble-free performance. 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 (usually beyond the "1 to 2 o'clock" position on the volume control). This results in very high levels of audible distortion, originating in the amplifier, which adds a harsh, gritty sound to the music. Contrary to popular belief, a speaker is more likely to be damaged by trying to get too much volume from a low-powered amp than from a high-powered one. Contact Polk Customer Service 800-377-7655 (9am--6pm, EST, Monday through Friday). Low Frequency Cut-Off For Mid-Range Speakers In Systems With Subwoofers Now that you have a subwoofer in your system, you may want to decrease the amount of bass going to your mid-range speakers. This will get you better mid-range sound and increase the power handling. There are two ways to roll off the bass before it gets to your mid-range speakers. One way is to use a "bass blocker, " a capacitor placed in series with the speaker input. Bass blockers are installed in series, one end connected with the positive lead from your amplifier and the other end connected to the positive lead of each of your speakers. Bass blocker capacitors (200 microfarad @ 100volts, non-polarized) are available at any RadioShack or parts supply house. [. . . ] If, upon examination at the Factory or Polk Audio Authorized Dealer it is determined that the unit was defective in materials or workmanship at any time during the Warranty period, Polk Audio or the Polk Audio Dealer will, at its option, repair or replace this Product at no additional charge, except as set forth below. Products replaced or repaired under this Warranty will be returned to you, within a reasonable time, freight prepaid. This Warranty does not include service or parts to repair damage caused by accident, disaster, misuse, abuse, negligence, inadequate packing or shipping procedures, commercial use, voltage inputs in excess of the rated maximum of the unit, cosmetic appearance of the cabinetry not directly attributable to defects in materials or workmanship, or service, repair, or modifications of the Product which has not been authorized or approved by Polk Audio. If this Product is defective in materials and workmanship as warranted above, your sole remedy shall be repair or replacement as provided above. [. . . ]