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Robert, G10 has no special damping properties that I detected. In fact it is some kind of plastic feeling material. It is “filament glass cloth material with an epoxy resin binder”.

http://www.polymerplastics.com/composite_g10.shtml

I do not fine it as “intellectually pleasant” as LBJ find it. I think gold is rather intellectually pleasant. However, I do find that the G10 is very pleasant to tough. It has that wet and leaky feeling that Teflon has but G10 is harder. It also appears that it has no epoxy-like hardness but “softer”. I do not know about self-damping but I do not think so. The G10  box I presume will sound like plastic box – I see no reason why it shell not. However, my bass drivers are in the very same page: the harden cloth. It all might just work all together… The only problem that I see with G10 is that I shall have more thinness and more bracing than it would need with still of aluminum… anyhow I have no judgment at this point what materiel I would use… I have no way to predict result until the box is made anyhow…

Regarding the 4’ MF driver. I do not know if I need it, I do not know how I might be using it and I do not have a lead idea what driver it might be. Some drivers were proposed. I would like do not have a rubber suspension I would like the mounting size of the driver be no more then 5” (the max width of the front baffle). For instance the AudioTechnology 4H521306, Foxtex 120A might be near OK if I use 2 of them but they are too wide.  I would like very much the monitor to be able to play loud, none of them do and I hate it. Therefore I need 2-3 octave in MF driver before the driver roll off kick in and thus something like ATC SM75-150S might be out of picture. So, the 4” drivers with primary resonance of 200-300Hz are out of picture and I need 70-90Hz of Fs if I cross at 700Hz.  Anyhow at this moment at the lead position is JBL LE5-2 or JBL 2105, side-wide they might barely fit. I never heard them but I have intimate knowledge about LE-8 and I like them a lot. I migh hope that the 5-incher would be in the same family of sound…

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