How were the 7004s hooked up? I see there’s no separate sub. Did you split off the sub/LFE to each speaker and set a ~80Hz x-over for the rest of the speaker? Or did you just run speaker wires to each speaker? The 2807 should power the 7004s just fine either way, but the former method may help take some stress off to provide more strength for the above x-over point frequencies.
However, adding an amp like the Emo, Sunfire, Rotel, etc. will really allow them to open up.