First off, I tend to gravitate towards speakers with an emphasized top end, but end up regretting it after sustained listening after higher volumes. - above 70 dB. The older Boston Acoustics - A100, A150 - could fatigue my ears in a second if cranked up. Lots of sizzle. The KEF LS50’s will also attack you if you point them directly at you; I hear the Meta’s aren’t so spikey. I thought any of the Elac bookshelves I listened to were smooth in their top end and never caused fatigue, but I never ended up keeping them around for long. Had some older Polk Audio ones which with also smooth but too prominent in the midrange for my tastes. Had a vintage McIntosh SS amp (and a Parasound A23+) which reined back the spikier ones.
