To do or not to do???

[nathan28]

I recently purchased an ed a3-300, it is built like a tank and sounds great, but i honestly was expecting more. I purchased it to replace my velodyne cht-12, ive had since 03. The velodyne gives the ed run for its money. Im thinking about running them both at the same time, i have never tried this. The Ed is a down firing sub and the velodyne is a forward firing sub. I have the ed in a corner, where should i place the velodyne? Will i need to flip the phase on one of them? and would it help the overall sound?
any help would be greatly appreciated. thanks