Hi everyone, longtime lurker first time poster here. Let me start off by saying that I'm pretty much a newbie at hi-fi in general. I've been reading around for a while but have very little real world experience with this stuff. Recently I found a deal I couldn't pass up for a pair of Infinity IRS Sigmas, which are a pretty big upgrade from my Kappa 6.1s. I currently have an Adcom GFA-555 on the lows and 545 on the mids/highs but these speakers feel like they need more. I have a few specific questions in mind, but any input with how to get the most out of these will be greatly appreciated, I want to give them the love and care they deserve, and I hope to have these as my primaries for a long time to come. 1. What should I do to make sure that I never even come close to burning the EMITs/EMIMs out? I've heard they are incredibly fragile to both clipping and excessive power. Since they are rare and expensive, I really don't even want to get close to hurting them in the first place. 2. How in the world do you position these things? My room is 14.5'x23' but I have to use it where they are on the longer wall because of a fireplace hearth being in the way. I've heard that they have to have some toe in, and also that any toe in destroys their soundstage. Overall I'm clueless on correctly positioning speakers. 3. What would you say is the best way to get high quality audio out of a PC and into a pre-amp? My current pre has RCA inputs only, and my motherboard doesn't have S/PDIF out so I would need to buy a sound card, but have been reluctant because I don't know what is good or bad for hi-fi. I would very much prefer doing this to using a CD player as I have accumulated a large collection of FLAC, SACD, and BluRay audio files of hard to find or expensive albums over the years that I would love to be able to really appreciate. 4. What kind of amp/preamp setup do you guys recommend striving for with these? My budget isn't huge so I would prefer to stay in the used market here but can go up to around $500/component. Hopefully that's enough for these monsters. 5. How many of these things are there? Unfortunately the seller didn't have the original crossover plates with the serial numbers on them, and finding real info on these things on the web seems impossible. Thanks for the help, any info or opinion is wanted.