Thiels are bright? Maybe 10-15yrs ago with the older models. Ive not heard the new CS1.7, but anything since CS2.4 are not bright, Id call them natural sounding. Maybe they heard them with some bright sounding sources. Anyway, Ive upgraded from a pr of CS2.4s to CS3.7s recently, driving them with a Krell int. amp KAV-400xi and I can listen to them all day long without ear fatigue. I thought the CS2.4s sounded good, but the CS3.7s are so much better, I dont think I can go back to a pr of CS2.4s anymore.