Standard materials specified by the inventor Thomas Trawöger and alternative materials that can be adapted for the Power Pyramid Version 12 this is the intent of this thread if you are building a Power Pyramid Version 12 and are interested in sharing in a positive experience please fell free to join us !
thanks for the info, very illustrative
bose life style (http://bose.net.au/bose-lifestyle/bose-lifestyle.html)Bose Acoustimass (http://audioaddiction.com.au/)