Ya ain't heard from me yet so hang onto yer hat.
Those Qe's with the Emit tweeters are very interesting but are rated at 4 Ohms and that rec'r ain't up to the task especially in tandem with the Betas which are going to be of a low sensitivity meaning that they will use up a lot of watts getting higher SPL's ... but the Emit tweeters are of particular interest to me. How do you like them? How do they sound compared to the Betas?
Your receiver's days are numbered if you're already eyeballing it but I bet your Betas would be more dynamic if you disconnected the Qe's. My guess is that the power supply in the rec'r will be freed up to power the Betas up more adequately. Sometimes less is more.
Anyway if you try it please let me know. PM me to get my attention. I'm curious to see if I'm right. Remember that we're on the honor system here.