I have a pair of the IRD monoblocks but since they are not compatible with my tubed linestage, I think I am going to sell them and pick up a pair of the Scott Nixon amps. I have heard great things about the Nixons but I was wondering if anyone has heard both of them? If so can you give me a little feedback? I will be using them to drive a pair of Meadowlark Swifts. Thanks.