I think the blue is indeed a heat transfer material. Some type of foam. Here you can see it in the D-Premier/D250 (not my picture). It connects directly to the bottom cover plate (aluminum) in a 250.
http://s632.photobucket.com/user/ghtoz/m...8.jpg.html
http://s632.photobucket.com/user/ghtoz/m...8.jpg.html
PS Audio P3, Shunyata ΞTRON Alpha Digital and HC/Furutech power cables, Paul Hynes SR7EHD-MR4, DIY Roon Server & Roon Endpoint running AudioLinux Headless, Phasure Lush^2 USB cable, Audioquest Diamond RJ/E ethernet, Uptone Audio etherREGEN, Mutec MC-3+ USB, Shunyata ΞTRON Anaconda Digital XLR AES/EBU, Devialet Expert 250 Pro CI, Nordost Tyr Reference LS cables, Von Schweikert VR-5 SE Anniversary Edition, Anti-Mode Dual Core 2.0, JL Audio Fathom F112. More detail here.
The Netherlands
The Netherlands