I think Emotiva may be right. The analog line inputs probably utilize the Pioneer's volume control and I didn't see any other Main In inputs that would bypass the volume control. The bottom line is you can still try it and compare it to the results with the UPA-700. I'd be very surprised if you don't hear an improvement with the Emotiva amp and it's just a better hookup situation, so if it were me I'd look to sell the Pioneer to offset some of the cost unless you really don't hear any improvement. Best of luck.