User manual POLK AUDIO EX II

[. . . ] E X S ERIES POLK AUDIO 5601 METRO DRIVE BALTIMORE, MARYLAND 21215 (800)377-7655 POLK AUDIO EUROPE LTD. ALBANS AL4 OPG GREAT BRITAIN TEL: 1727. 827311 POLK AUDIO GERMANY UNTERTUERKHEIMER STR. 24 D - 66117 SAARBRUECKEN GERMANY TEL: (49) 681 5800 888 Polk Audio EX Series II Owner's Manual http://www. polkaudio. com "Polk Audio" and "The Speaker Specialists" are trademarks of Britannia Investment Corporation used under license by Polk Audio Incorporated. A WORD FROM MATTHEW POLK Dear Music Lover, ATTACH YOUR RECEIPT HERE AND FILE FOR FUTURE REFERENCE X Thank you for purchasing Polk Audio speakers. Designing and building speakers is more than just a business for the people of Polk Audio ­ it is our passion. [. . . ] The downsides of the band pass box are numerous. First, the construction must be flawless, any airleaks or rattles will seriously degrade performance. 7 Second, designing band-pass boxes is as much art as science, just because a computer program says that a certain design will work is no guarantee that you will like the performance of the finished design. Third, all subwoofer enclosures exhibit a phenomenon known as "group delay". It means that the sounds from the subwoofer will lag in time from the sounds created by your high frequency speakers. This causes a smearing of the sound and in worst cases a ping-pong effect from the highs in the front of your car to the bass in the rear. Band-pass boxes are especially prone to long group delays. Finally, the pressures and vacuums formed within a band-pass box can be extremely high, if the subwoofer you are utilizing does not have a very stiff cone. It can buckle under the high pressures, making very bad noises. The Polk EX subwoofers utilize 1mm thick mineral filled cones, and are extremely well suited for use in band-pass enclosures. TOOLS YOU WILL NEED TO BUILD YOUR ENCLOSURE PARTS YOU WILL NEED TO BUILD YOUR ENCLOSURE There are three choices of enclosure material: 1. After measuring, subtract 1. 5" from each dimension. This compensates for the thickness of the material you use, and will give you your usable (internal) dimensions. Record these dimensions in the space below for future reference. Maximum dimensions Height:__________inches Width:___________inches Depth:___________inches Usable dimensions (Minus 1. 5 inches)=______inches (Minus 1. 5 inches)=______inches (Minus 1. 5 inches)=______inches Usable volume=________cubic inches Usable volume=________cubic feet 17 1/2" 16" 34" 35 1/2" You now have all the dimensions you need to begin cutting out your wood. The illustration above shows a diagram of the enclosure with all the panel sizes that need to be cut. 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. You will need to cut out the hole for your EX subwoofer and your terminal cup. The terminal cup is a connector that allows you to plug and unplug the wires from your amplifier into the enclosure. You may want to have a friend help you with assembly since it's hard to hold the pieces together and assemble them at the same time. When building your subwoofer enclosure, we suggest that you use wood glue in combination with wood screws for the strongest joint. We also suggest that you use one screw about every three inches along the seams of your enclosure. Assemble the enclosure as shown in the above diagram, but leave one side off. [. . . ] warrants the original purchaser only that this Polk Audio EX Series II Product (the Product) will be free from defects in materials and workmanship for a period of (1) one year from the date of original retail purchase from a Polk Audio Authorized Dealer. However, this warranty will automatically terminate prior to the expiration of the (1) one year period if the original retail purchaser sells or otherwise transfers the Product to any other party. The original retail purchaser shall herein after be referred to as "you. " To allow Polk Audio to offer the best possible warranty service, please fill out the Product Registration Card(s) and send them to the Factory at the address provided in the Registration Card within (10) ten days of the date of purchase. Defective Products must be shipped, together with a proof of purchase, prepaid insured to the Authorized Polk Audio Dealer from whom you purchased the Product, or to the Factory at the address given in this booklet. [. . . ]