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. [. . . ] If the two wave fronts are not isolated from each other they will mix 6 Band-Pass boxes can be built in a near infinite amount of configurations. They incorporate at least two individual chambers and are by far the most complicated box to model and build. The theory behind band-pass boxes is to limit the frequencies produced by the subwoofer, thereby making it more efficient in the frequencies that it produces. A by-product of this efficiency is that it is often possible to build a band-pass box much smaller than its equivalent acoustic suspension box and get the same quantity of acoustic output. If you have a very small car with limited room for a subwoofer box, a band-pass box may be a good choice. 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. 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. 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. This compensates for the thickness of the material you use, and will give you your usable (internal) dimensions. 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. [. . . ] If you need assistance or have any questions, call 1-800-377-POLK (7655) between 9am and 5pm, Monday through Friday Eastern Time. 12 13 EX SERIES II SUBWOOFER SPECIFICATIONS EX SERIES II 1 YEAR WARRANTY EX8 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 volume(cubic feet) (liters) Ported Ported volume(cubic feet) (liters) Port diameter (inches) (millimeters) Port length (inches) (millimeters) Tuning frequency (Hz) Bandpass Bandpass total volume (cubic feet) (liters) Front chamber volume (cubic feet) (liters) Back chamber volume (cubic feet) (liters) Port diameter (inches) (millimeters) Port length (inches) (millimeters) Back chamber tuning frequency (Hz) subwoofer 8" 4ohms 20-300Hz 44. 64Hz 3. 73 ohms 1. 57 mH 11. 43 0. 57 0. 54 0. 66 ft3 18. 51L 125watts 300watts 90 dB 0. 177 in. 3 7/8" 85 mm 4 1/4" 110 mm 7 1/8" 180 mm EX10 subwoofer 10" 4ohms 20-400Hz 32. 47Hz 3. 34 ohms 1. 55 mH 8. 27 0. 48 0. 45 1. 59 ft3 44. 56L 150watts 400watts 92 dB 0. 177 in. 4 11/16" 120 mm 5 1/16" 130 mm 9 1/16" 230 mm EX12 subwoofer 12" 4ohms 20-500Hz 24. 47Hz 3. 38 ohms 1. 40 mH 8. 14 0. 31 0. 30 4. 72 ft3 132. 02L 150watts 400watts 93 dB 0. 177 in. 5 3/8" 135 mm 5 3/4" 145 mm 10 7/8" 276 mm Polk Audio, Inc. 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