This thread has been a very long time coming but I figured some feedback is in order as I've been able to A/B/C these speakers over the last several weeks. I'd like to preface the following by stating that this is my opinion/conclusion after listening to a variety of source material using my associated equipment in my listening space (YMMV). QLS Bass - Buttery smooth, powerful and exceedingly deep. Nice integration into the midrange. QLS Midrange - Warm and somewhat forward. Smooth. Very pleasant and easy to listen to. QLS Highs - Smooth, never harsh or fatiguing in any way. Maybe a bit recessed. Kappa 8 Bass (Extended XO Mode) - Forceful. Bass region seems almost separate from the rest of the speaker. Not nearly as well integrated into the midrange as the QLS. Kappa 8 Midrange - Very pleasant. Not as smooth (warm) as the QLS but likely a bit more accurate. I noticed the ability to pick out distinct sounds throughout the dynamic range. Kappa 8 Highs - Surprisingly not bright or fatiguing at all. Very accurate and crisp. A bit of sizzle but not harsh. RS 2.5 Bass - Excellent in the transients with no "hangover" of notes. A bit tighter than the QLS but no where near as smooth, powerful or deep. RS 2.5 Midrange - At first I was in love with the dipole all-over sound stage. However, after more critical listening I felt that the midrange did not have the warmth of the QLS or the ability to really separate the distinct midrange sounds of the Kappa 8s. I wanted to think the EMIM was more accurate than the either the Kappa 8s or QLS but after more listening I cannot reach that conclusion. In some ways the jury is still out as I'm guessing the EMIMs would sound better on tubes but with tubes or without I doubt the ability to separate midrange would improve. RS 2.5 Highs - Frankly, kind of harsh and bright yet accurate and detailed. Again, I feel tubes or a "warmer" amplifier would have helped. Overall placement: First Place: Infinity QLS-1 - Perhaps not as accurate as contemporary speakers but exceedingly pleasant to listen to from 18Hz to 30kHz at all volume levels and on all types of music. Second Place: Infinity Kappa 8 - Accurate and detailed mids and highs overshadowed by slightly booming bass response. Excellent imaging. Third Place: Infinity RS 2.5 - A promising speaker perhaps let down by amplification. Against these competitors in this environment it did not finish better that third in any one category.