E X S ERIES POLK AUDIO 5601 METRO DRIVE BALTIMORE, MARYLAND 21215 (800)377-7655 POLK AUDIO EUROPE LTD. TYTTENHANGER HOUSE COURSERS ROAD ST. ALBANS AL4 OPG GREAT BRITAIN TEL: 1727.827311 POLK AUDIO GERMANY UNTERTUERKHEIMER STR. 24 D - 66117 SAARBRUECKEN GERMANY TEL: (49) 681 5800 888 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 POLK AUDIO – A HISTORY OF EXCELLENCE Polk Audio was founded in 1972 by Matthew Polk and George Klopfer. Their dream was to make speakers with the performance of the world’s best speakers, at a reasonable price. They did so by applying scientific principles to speaker design and by concentrating solely on the speaker business. That is how Polk became known as “The Speaker Specialists.
EX SERIES II SUBWOOFER FEATURES: BUILDING YOUR OWN SUBWOOFER ENCLOSURE The EX Series II subwoofers use the latest technologies and highest quality materials to provide you with the best bass response and greatest reliability possible. The EX Series II subwoofers have been optimized to give skull-collapsing performance from a wide variety of enclosure types.
ACOUSTIC SUSPENSION ENCLOSURES FIGURE 1. The acoustic suspension cabinet is a sealed airtight box, and is the simplest, easiest box to build. It is a very predictable enclosure with easily calculated parameters and a smooth natural sound. Properly built acoustic suspension cabinets have a reasonably flat frequency response that begins rolling off at 12 dB per octave at the frequencies below its cabinet resonance.
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.
DESIGNING YOUR POLK EX SUBWOOFER ENCLOSURE STEP BY STEP FIGURE 5. 1.) How much room do you have to work with in your car or truck? 2.) Which of the above enclosures sounds the best to you? 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 Multiply your usable Width x Height x Depth. The product will be the usable (internal) volume of your enclosure in cubic inches.
When building a ported enclosure we suggest that, whenever possible, you locate the port on the same baffle as your subwoofer. Your port should be unobstructed both in front of and behind it by at least 1 to 2 times the diameter of the port. If, on the inside of your enclosure, the port comes within 1 to 2 times its diameter of the rear wall, you will need to “bend” your port tube.
EX SERIES II SUBWOOFER SPECIFICATIONS THIELE/SMALL PARAMETERS Type Driver Complement Nominal Impedance Frequency response Fs (Hz) Re Le Qms Qes Qts Vas (cubic feet) Vas (liters) Power Handling (watts continuous) Power Handling (watts peak) Sensitivity (SPL at 1 watt / 1 meter) Xmax (inches) Xmax (millimeters) Voicecoil Diameter Mounting depth (inches) top mount (millimeters) Mounting depth (inches) bottom mount (millimeters) Mounting diameter (inches) (millimeters) RECOMMENDED ENCLOSURES Sealed Sealed volu
