Opinions and recommendations on active loudspeakers

There may be others as good, I’ve not auditioned all that there is obviously, but I’m confidant that none are finer than PSI Audio Active Studio Monitors. They are built in Switzerland by a company that is an offshoot of Revox, if that rings a bell, and they are to speakers what Swiss is to watches, none finer. They’re profession gear, and uncommon in the U. S., so you’ll not find them in any audio salon. But trust me, I’ve used a pair of A-21Ms in my mastering studio for several years now, and they’ve completely cured me of any "upgradeitis." They’re utterly clean, utterly neutral, utterly transparent, detailed, and as "fast" and dynamic as any speaker built, with pinpoint imaging and not at all fatiguing. They sonically disappear and one is left simply listening "down the wire" to the source; I listen to them all day. If I was ever to replace my "living room" setup (Thiel speakers, Classé amp), it would be with PSIs. As I said, none finer.
http://www.hifiplus.com/articles/psi-audio-a-14m-active-powered-loudspeaker-tas-212/
https://www.zenproaudio.com/brands/PSI-Audio.html

Why would any audiophile want to have power amps 'glued' to speakers ? First, you are stuck with those amps, and second they will vibrate like hell. Who makes amps for ATC, by the way ?

@inna Because those would be the amps that best matches the speakers capabilities and maximize their potential,  chosen by the designer of the speaker themselves. ATC makes their own amps.

Cost and effort saving solution for pro applications.

@inna Not. At. All. The first concern, by far, is sound quality. One's job depends on it. But pros are generally a no-nonsense bunch with better things to concern themselves with than pointless tweaks. Active monitors are a very well proven concept, and they generally DO offer substantially more real value for the money invested. So from that perspective, one might think that they're "cost and effort saving," but the proof is in the studio, even studios where cost is a very secondary concern. Active monitors are VERY widely accepted by professionals for the quality of their sound, regardless of cost.