Hi guys, I have a Pioneer VSX895 AV amp from a couple of years ago but it doesn't seem to be driving my Celestion A2s very well. I've been offered a Roksan Caspian 5 channel power amp for 500. How much of an improvement would I get from it? I could possibly bi-amp the Celestions by using 4 of the 5 channels from the Roksan? Is 500 for the Caspian a good deal? Cherers!