I read with interest a recent posting concerning the Bose sound. Comparing the Bose system to The 2013 911, I find the sound in my 2015 Cayman much more boomy. I understand the cabin in both cars are not alike but I am disappointed in the sound when playing different sources and satellite stations. Although I can control some Boomyness by adjusting the base level, I feel I should not have to go to the negative side of flat to accomplish this. I used to install custom stereo systems in my cars but I have not done so in several years. I would be interested if there are any members that have worked on the Bose systems found in a Porsche. As mentioned in a previous posting is it possible to control some of the base level within the system using poly fill material within the speaker enclosure. If anyone has any experience with this along with the location and access to the speaker enclosures I would appreciate hearing from you.