I would expect the 755Es with tweeters to sound really good. You'll get more bass and more highs than with the 755A. Unfortunately they won't have the magic (for lack of a better word) of the standalone As. As for using the Es alone you will miss the highs. I've had several pairs of A, E and C's. The A's are in a different league. I've used them alone, with tweeters, supertweeters, subwoofers, etc. Unless you listen to big symphonic works the As do everything right in my opinion. Silver speaker wiring works wonders with them, the amount of filling in the cabinets too and, above all, placement is paramount.
