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. If you are using PVC pipe you can either cut your port on a 45 degree angle and rotate the cut portion by 90 degrees, and glue (using PVC cement) or you could buy a 90 degree elbow from your local hardware store. If you are using a card board port tube you will have to use the cut and rotate method. Since you will be unable to install a “bent” port from outside the enclosure, you can now see why we recommended leaving your baffle board off until last.
Finally, one last thing you could do to your enclosure before installing it is to 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 still achieve the same net result as the full size unstuffed box. The easiest way to do this is to use dacron pillow stuffing which can be purchased 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 of the enclosure. When stuffing a ported enclosure, it is important not to obstruct the port with the dacron.
Although your new EX 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, please 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 EX Subwoofers.
AMPLIFIER POWER REQUIREMENTS
Your speakers will work well with a variety of electronic components. As little as 50 watts per channel will deliver adequate listening levels in most cars. 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. More power is always better. Consult your Polk Audio dealer for specific recommendations.
SAFE LIMITS OF OPERATION
Your Polk loudspeakers are made with the highest quality materials for years of
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 FREQUENCY CUT - OFF FOR SYSTEMS WITH SUBWOOFERS
Now that you have a subwoofer in your system, you may want to decrease the amount of bass going to your
TECHNICAL ASSISTANCE
Good luck and enjoy your new Polk EX Series II Subwoofers. If you need assistance or have any questions, call
12 | 13 |
