For PMC speakers, best response is if you sit with your ears at a hight between tweeter and midrange. Or tilted towards the midrange, more so than tweeter. Check how high your sofa is and at what height your ears will be when you listen. I also have PMC, but AML-1. My stands also needs to be higtened.. Do a serious check or suffer twice buying new stands. I had the IB-2 at home demo with Krell FPB 600c and Esoteric P-70 & D-70. Very nice, treble could be a little provocative if pointed direct at ear. Different IC's did a substancial difference, but still electronics and matching is the (sonic)key. The 700cx had been solving all that in this setup. As it is smoother, darker and slightly warmer sounding than 600c.
Otherwise AML-1 with Benchmark dac-1 usb is a cheaper way. Also quite good for small space and small pocket.
The IB-2 is better choice than IB-1, no question.
Just use a big power amp and realize punch and dynamics in spades.
Cheers!!