I've completely finished both G4000s.
G4000 #1 uses WIMA polypropelene and Nichicon lytics with DBX 202 VCAs.
G4000 #2 uses Panasonic polyesters and Panasonic FC lytics with THAT 2180LBs.
I did some A/B comparisons yesterday at my studio, and they sound significantly different. G4000 #2 has much brighter top end and a very mid scooped sound (which I'm not a huge fan off), and G4000 #1 is much more focused and rich in the midrange. I put them both on a stereo overhead pair and the drum buss, and in both applications I felt G4000 #1 had a greater impact. The snare drum became much more powerful without destroying the cymbals with too much compression. The G4000 #2 seemed to emphasize the top end too much, which made the cymbals a bit harsh. I think I'm going to replace all the FCs on G4000#2.
Also, I have some extra 2180LBs that I'm trying to sell... I'll post in the Black Market.
And I'll also post some guts of the two units in a day or two. Of the 4 G4000s I've built, the one with the WIMAs and DBX 202s is my favorite !!!
Thanks again Gyraf !!!