You are going to be busy
It will be a fairer comparison with the addition of the PDT4-F CDP because there should be an obvious synergy between the PDT4-F CDP and your IA4 and the EMCIUP with the ECI5 . You could use your CDX2 with the Perreaux and just swap the speakers around for the first comparison then do a mix and match to see what happens, but just think of all the possible combinations :O you are really going to have your work cut out
When I was trying different amps before I bought my Electro' s I tried all the usual suspects including Krell , Primare , Bryston , Sugden, Audiolab and many more , and narrowed it down to the Sugden masterclass pre and stereo power amp and then borrowed a pair from my dealer for home demo .
I had also asked to demo the Electrocompaniet EC 4.7 pre and AW 120 DMB power amp but they had problem getting a pair from Castle Acoustics who were the importers at the time so I took the Sugdens home for a few days and was very impressed with them they sounded wonderful but I found they were very fussy about what type of music I played. Simple acoustic and vocal music was absolutely wonderful but as soon as I put anything with deep powerful rhythms or thick complex sounding type music the image just collapsed in a heap on the floor and the sound was thin hard and unpleasant , it seems that they reached the limits of the available performance very quickly and I am not talking about at high volume levels either !
Then I had a phone call from my dealer to say that the Electro's had arrived so I picked them up took them home and did a side by side comparison .
Well in fact there was no comparison the Electrocompaniet combo just sounded so much better with all types of music , it did not matter what I threw at them they just did it effortlessly without any fuss in a totally natural way .
At that time the Electro,s were half the price of the Sugden pair so that was a bonus too , and the rest is history
Good luck with the listening and I really hope you find what you are looking for as I have done .
One tip I can give you that works for me is to not try and analyse or dissect the music when doing comparisons try to listen to the the music as a whole as you would when listening to a live performance . Forget about all the HiFi nonsense and listen to the music, and if one of the combinations you listen to makes you forget that you are trying to choose a HiFi system even for a short moment then that is the one you should probably buy.
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