I'm fortunate enough to own both the YG Hailey and Avalon Eidolon Diamond and I swap between the 2. IMO both speakers belong to the "modern" "cool" school of sound. The YGs sound like electrostats when playing easy programs at moderate volumes, even when driven with moderately powered amps (say 50W tube and 100W SS). But to get them to really bloom and sing you have to "skip the next rung" and go with mega high current amps that are unconditionally stable yet sweet sounding. If you think a 150W to 200W amp can play it full range, then you are missing a whole lot of potential from the speakers. Placement is wickedly difficult because the bass is definitely lean. The Hailey is supposed to be a full range speaker. Not quite, when compared to the similar sized Eidolon Diamond. But the truth of timbre and texture it reproduces when driven properly gets it right at the level of Focal Utopia Bes without the noticeable mid-bass hump and sluggish lack of pace of the Focals. In my far from perfect room was able to get pretty good results bi-amping, and adjusting the bass amp to be about 2-3dB higher in gain than the main amp. With that combination I can play the Haileys loud enough to fill the room and have enough authority and no thinning out.
