>>>From the perspective of what gives you optimum HT sound reproduction and keeping in mind that famous Harmon report on multiple subs I'd order it as follows:
1. 4 ep600s 2. 3 ep600s and 1 ep500 3. 2 ep600s and 2 ep500s 4. 1 ep600 and 3 ep500s 5. 4 ep500s 6. 3 ep 600s 7. 2 ep 600s and 1 ep 500 8. 1 ep600 and 2 ep500s 9. 3 ep500s 10. 2 ep600s 11. 1 ep600 and 1 ep500 12. 2 ep500s 13. 1 ep600 14. 1 ep 500