Does anyone here know from experience with these sets which drivers are grouped in a bi-amped setup? It makes sense that the tweeter and 4" would be grouped, and that the 6.5 would be isolated to the 2nd amp. However, when I spoke to a gentleman at BA, he said that the tweeter was isolated and the 4 and 6.5 were grouped. Normally, I would take his word, but he was less than familiar with the older products and initially didn't know the 3 way sets by model #. Any help would be greatly appreciated.