I'm not viking , but I have . Built two seperate ap enclosures for a world champion IASCA car in the early 90's. Good god I'm starting to show my age. Built the enclosures out of acrylic cylinders under the rear deck in a grand prix. Cutting holes in the trunk floor of an almost brand new car was kind of tedious with the owner standing over my shoulder the entire time. We used stainless mesh and fiberglass for the mats, with a layer of goretex on the outside to keep everything dry. Took a while to get the mats tuned right, but man did it sound good
I have built/experimanted with the aperiodic design on a couple of enclosures. One was for a car, the other for home audio use. In the car i used an Soundstreamm SS 12, i dont remember the specifics of the box as this was years ago, but i do recall after playing with the density of the compressed matt, and size of the hole, I got some very good sound out of it. Seemed to have slightly better low frequency extension in the car over a sealed or vented box. But this was only evident on recordings that truely went below 35 or 40 Hz, Most recordings dont. I If you are looking to build one, give it a try. they are a little more difficult to tune in properly, as i am unaware of any "programs" that define density or diameter of the hole. what i did was hit and miss and experimentation. But overall, i would rather just go with a more conventional enclosure, Most any low frequency exttension that might be realized by this design is going to be drowned out by road noise IMO.
