Which amp for my Renaissance 90s?

Congrats on your purchase. I also have these speakers and they are very special indeed. I use a Krell FPB300cx amp and it seems a perfect match. This amp costs a chunk of change so you may not want to use something so spendy. There are a couple of Infinity forums out there than have a lot of information. I feel one important note is make sure you have enough CLEAN power. The High Energy EMIT & EMIM speakers like clean, good power. If you blow one you will be in a world of hurt finding a replacement. The owners manual says they have a self-protection circuit. I've never heard it kick in which is a good thing. Be carefull with those tweeters.
Enjoy, John

On the cheaper end of things a Parasound A21 works pretty good. I have owned a number of Infinity loudspeakers including the Renaissance 80s. They like lots of power and can be matched to the best gear, if you choose. I also liked the Conrad Johnson Sonographe amp but it has the C-J flavor (if you like that). The biggest mistake would be to put a dry sounding amp with the EMIMs, not a good match.

Thanks for your response guys.
I did a quick search on Infinity forums but didn't find any :(
Jsd52756 Would you have the web address to any of them?
Thanks again

My hunch is a conrad-johnson Premier 350. Several years ago I heard a c-j 350 driving an Infinity IRS Omega. This pairing was reference level. I don't remember the cables or digital source but i'm sure the c-j was very influential. Both the IRS Omega and c-j Premier 350 remain all time favorites of mine!