Horn loaded speakers are generally so efficient that it’s critical that whatever amp you’re driving them with needs to sound good in the first few to maybe 30 watt peaks. Many solid state amps don’t unless they stay in class “A” mode throughout this range.
I’ve owned a few Avant-garde’s & now Volti Audio Rivals. Set up properly with good quality electronics & source, they all sound excellent. They don’t have the most extended & airy top end than newer , good & expensive dome or AMT tweeters can offer w/ heroic amplification & maybe not the ultimate in sound stage depth but not harsh or shouty at all. The dynamics of course, are unmatched by anything other than live music.
Good horn loaded speakers can sound “live” vs really good “hi fi” for just about all other speaker designs imo. I prefer live sound.