Polk Audio dX8 User's Manual
Contents
1. polk axSeries Polk Audio dX Series Dynamic Balance Subwoofers Premium Performance Loudspeakers Owner s Manual dX8 Subwoofer dX10O Subwoofer dX12 Subwoofer dX Subwoofers More Bass Less Space The dX Series of subwoofers use the latest technologies and highest quality mate rials to provide you with the best bass response and greatest reliability possible The dX subwoofers have been optimized to give the kind of skull collapsing performance one would expect from huge enclosures in boxes that take up a fraction of the trunk space Some of their design elements are Attach your receipt here and file for future Polymer and graphite composite cones the stiffest cones in the reference It may autosound industry are able to withstand the enormous pressures generated be required for inside small enclosures without breakup and distortion warranty service High mass cones allows awesome low frequency tuning in small enclosures Thick ABS dustcap prevents distortion due to the build up of air pressure X behind the cap High durometer rubber surrounds provides a much tighter and more durable air seal behind the cone than foam paper or cloth surrounds for deep tight quick bass Also rubber surrounds do not dry rot like the foam surrounds used by other manufacturers Extra long precision wrapped vented coils for superior cooling and high power handling Four layer 2 voice coil handles the hea2. You will need to cut out the hole for your Dynamic Balance subwoofer and your terminal cup and pre drill the holes for your screws 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 buddy 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 Gasket must be applied if install requires a top mount Affix foam gasket sections the back of the basket rim as shown polk dxSeries 8 Premium Performance Loudspeakers 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 We suggest that you leave off the baffle board this will allow you to seal your enclosure more easily and an air tight seal is crucial The best way to insure an air tight seal is to seal the inside of your enclosure with quality silicone caulk This also includes sealing around your input termi nal cup and if you are using a ported enclosure around your port It is not advised to use silicone around your subwoofer when mounting it to the baffle Instead we recommend using the foam gasket weather stripping supplied with your dX subwoofer When mounting your subwoofer to the baffle board
3. frequency at which bass gain begins and L is the longest dimension of your room If for example you measured the longest dimension of your car as 5 65 ft the room gain begins at 565 5 65 or 100 Hz 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 Two identical systems will sound very different in a Honda vs a Cadillac The bigger the car the lower the frequency at which room gain begins Tools You Will Need To Build Your Enclosure If you have decided to build your own enclosure for your Polk dX subwoofers here is a list of the tools you should have available to you LI Calculator 1 Assorted Drill bits CI Screwdriver bit for drill or manual screwdriver 1 Circular saw LI Tape measure 4 Drill electric or cordless Li Jigsaw polk Premium Performance Loudspeakers 5 Parts You Will Need To Build Your Enclosure When building a subwoofer enclosure you will find that there are numerous materials recommended for construction 1 Medium density fiberboard MDF 2 Marine grade plywood 3 Particle board the smaller
4. the exclusion or limitation of consequential damages so the above limitation and exclusion may not apply to you This Warranty gives you specific legal rights which may vary from state to state This warranty applies only to Products purchased in the United States of America its possessions and U S and NATO armed forces exchanges and audio clubs The Warranty terms and conditions applicable to Products purchased in other countries are available from the Polk Audio Authorized Distributors in such countries polk Premium Performance Loudspeakers 11 oet LsevazTo The Speaker Specialists 5601 Metro Drive Baltimore Maryland 21215 e 800 377 7655 http www polkaudio com Polk Polk Audio The Speaker Specialists and Dynamic Balance are registered trademarks of Polk Investment Corporation used under license by Polk Audio Incorporated ce RM0294 1
5. 30z Magnet Weight 1 1kg 1 1kg 2 5lb 2 5 b Vd Volume of Driver 022 ft 022 ft Driver Cut out Diameter 7 26 7 26 8 amp m 84cm polk 10 Premium Performance Loudspeakers Tu 9 50 3 6om 930 B m 11 16 ae dX Series 1 Year Warranty Polk Audio Inc warrants the original purchaser only that this Polk Audio dX 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 Polk Audio 2550 Britannia Blvd Suite D San Diego CA 92154 Products must be shipped in the original shipping container or its equivalent in any case the risk of loss or damage in transit is to be borne by you If upon examination a
6. Here s a sample enclosure Hole diameter dX8 7 26 dX10 9 30 dX12 11 16 Usable dimensions Maximum dimensions Height 15 5 inches Minus 1 5 inches 14 inches Width 29 5 inches Minus 1 5 inches 28 inches Depth 10 5 inches Minus 1 5 inches 9 inches Usable volume 3528 cubic inches Usable volume 2 042 cubic feet polk Premium Performance Loudspeakers 7 By looking at the chart at the end of the technical sheet you find that this usable volume is slightly more than double the recommended volume for a single dX10 in either a sealed or vented enclosure Assuming that you will be using a pair of woofers this will work out well If you are using a single subwoofer you can cut your width in half Since we will be using a pair of dX10 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 You now have all the dimensions you need to begin cutting out your wood The illustration on page 7 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
7. aximum height width and depth you can use Pay attention to trunk hinges and tension bars If your enclosure is going in an area other than a trunk make sure you check for similar obstructions After measuring subtract 1 5 from each dimension This compensates for the thickness of the material you use simply double the thickness i e if you re using 3 4 material subtract 1 1 2 1 material subtract 2 etc and will give you your usable internal dimensions Record these dimensions here for future reference polk dxSeries 6 Premium Performance Loudspeakers Maximum dimensions Usable dimensions Height inches Minus 1 5 inches inches Width inches Minus 1 5 inches inches Depth 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 Divide this number by 1728 the number of cubic inches in a cubic foot This will give you the internal volume in cubic feet Divide your internal cubic feet by 2 only if you are using a pair of dX subwoofers Compare this number to the chart at the bottom of the technical sheet Choose the recommended enclosure which is closest in size or that fits your desired type of enclosure Now that you have all of your needed dimensions you can begin cutting your wood From the above chart you can tell how big each piece of wood should be
8. pre drill your mounting holes This will make the mounting of your subwoofer easier and will help prevent damage to your subwoofer from aslip of the drill When securing your subwoofer to the enclosure we recommend using bolts and tee nuts but if you prefer you can use wood screws Whichever you use make sure they are at least 1 25 long This will insure a good grip into the wood One last thing you could do to your enclosure before installing it is stuff it The primary reason for stuffing an enclosure is to trick the woofer into thinking that the enclosure is larger than it actually is You would want to do this if you build your box smaller than the recommended size By stuffing the box you can build the box as much as 10 smaller than recommended and achieve the same net result as the full size unstuffed box The easiest way to do this is to use dacron pillow stuffing It can be bought from craft stores fairly inexpensively The rule of thumb for stuffing your enclosure is 1 pound of dacron per cubic foot When putting the Dacron into your enclosure do not pack it in rather place it evenly around the inside the enclosure When stuffing a ported enclosure it is important not to obstruct the port or the vent on the back of the sub with Dacron Although your new dX subwoofers were designed to work in a wide variety of enclosures and configurations we have included only the most popular ones For more enclosures and configurations plea
9. se contact your local authorized Polk Audio dealer We hope that this manual has helped to take the mystery out of designing an enclosure for your new Polk Audio dX Subwoofers Refer to insert for recommended enclosure design What If Need Help Good luck to you and enjoy your new Polk dX Subwoofers If you need assistance or have any questions call 1 800 377 7655 between 9am and 6pm Monday through Friday Eastern Standard Time M Premium Performance Loudspeakers 9 Dynamic Balance Series Subwoofer Technical Sheet THEILE SMALL PARAMETERS dX10 4Q 20 300 Hz dX10 8Q 20 300Hz dX12 4Q 20 200Hz dX12 8Q 20 200Hz 0330m2 355ft2 1 00in 8 70mm 34in 1 0in 293in 1 0in 05 14m 5532 25 4mm 1 00in 8 70mm 343in 1 0in 0514m2 553i 22 9mm 90in 293in 25 4mm 1 0in 3 7kg dX8 4Q dX8 80 Freq Response 20 500Hz 20 500Hz Sensitivity 84dB 84dB Impedance Nomina 4Q 8Q Impedance Actual 37 8 6 Max Power RMS 200 W 200 W Max Power Peak 400 W 400 W Resonant Freq Fo Fs 30 Hz 34 Hz Qms 6 52 6 9 Qes 0 48 0 6 Qts 0 45 0 55 Vas 14 291 13 00L 511p A6 f Cms 2225ym N 2023 pm N BL 13 4 TM 17 1 TM sd 0214m 0214m aot 23082 Winding Width 25 4mm 229mm 1 00in 90in Xmax Linear 8 70mm 7 8mm Ain 293in Xmax Mechanical 25 4mm 25 4mm 1 0in 1 0in Le 1 5mH 2 5mH Mms 125 9 g 1072g Driver Weight 3 7kg 3 7kg 8lb 30z 8lb
10. t generated when your amp is really cranking Vented pole piece lets air circulate over the voice coil to keep it cool and in control even when the bass is really thumping e 8 Ohm and 4 Ohm versions available allows you to choose the impedance that suits your personal system design including exotic isobaric and push pull types polk Polk 2 Premium Performance Loudspeakers Premium Performance Loudspeakers 3 Who Is Going To Build Your Subwoofer Enclosure Since the subwoofer enclosure is so critical to getting the best performance from your dX subs you should ask yourself the following questions 1 Do I really enjoy working with my hands 2 Do I have good woodworking and mechanical skills 3 Do I have or have access to woodworking and electrical tools 4 Do I have a solid understanding about musical reproduction in an automobile amp If you answered NO to any of the above questions we recommend you choose one of these two possible alternatives First there are pre built subwoofer enclosures on the market from manufacturers like Q Logic and R T or enclosure kits from BassLine and others The second alternative is to have your authorized Polk Audio dealer design and build a woofer box for you amp If you answered YES to all of the above let s review some basics before you begin Building Your Own Enclosure The dX subwoofers have been optimized to give you flat bass response in small sealed enclosures Some lis
11. t 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 All replaced parts and Products become property of Polk Audio 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 appear ance 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 This Warranty is in lieu of all other expressed Warranties If this Product is defective in materials and workmanship as warranted above your sole rem edy shall be repair or replacement as provided above In no event will Polk Audio Inc be liable to you for any incidental or consequential damages arising out of the use or inability to use the Product even if Polk Audio Inc or a Polk Audio Dealer has been advised of the possibility of such damages or any other claim by any other party Some states do not allow
12. teners may want response other than flat or may want to trade off depth of response for greater efficiency by using a vented enclosure There is no way we could provide all the information for all of the options here This manual will give you enough information to build a great sounding small sealed enclosure If you are interested in a greater choice of enclosure designs your Polk dX Series dealer has extensive experience designing woofer boxes and will be more than happy to work with you If you prefer you can call our Customer Service Department from 9AM to 6PM Monday through Friday Eastern Time at 800 377 7655 polk 4 Premium Performance Loudspeakers Acoustic Suspension Enclosures As the dX subwoofers are optimized for acoustic suspension enclosures we suggest you use this type of design The acoustic suspension cabinet is a sealed airtight box and is the easiest box to build It also is a very predictable enclosure with easily calculated parameters and it has a smooth natural sound Properly built acoustic suspension cabinets have a flat frequency response that begins rolling off at 12 dB per octave at the frequencies below its cabinet resonance This works very well inside a car because of a natural phenomenon called room gain or transfer function that gives you a 12 dB per octave increase in bass frequencies You can roughly calculate at what frequency this gain begins by using the equation F 565 L F is the
13. 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 This will provide the rigidity necessary for optimum performance 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 Complete Parts List 1 Wood particle board MDE or marine grade plywood 4 x 8 x 3 4 sheet 2 Wood glue one 12 16 oz bottle 3 1 4 x 8 wood screws one Ib box 4 Caulk gun and silicon caulk two tubes 5 Terminal cup one per speaker available at electronic parts stores 6 Speaker wire 2 4 ft 7 Carpet optional 8 Grills to protect your subwoofers optional 9 Solderless speaker connectors available at electronic parts stores Designing Your Polk dX Subwoofer Enclosure Step By Step 1 How much room do you have to work with in your car or truck 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 m
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