Quote:

I’m seriously considering peddling the 600 and buying two 500’s because I just don’t have room for it. If I go with two 500’s, I could put them under the screen and hopefully sound as well as the single 600.



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

The biggest incremental improvement is going from one sub to two subs or in your case an ep600 to 2 500s. Its diminishing returns beyond two 500s but I have to say a pair of 600s provides outstanding bass in my HT.

Whether you place the subs together or not will depend on your particular room acoustics.

John