Have l become unstable?

I own a set of ATC SCM-20A active monitors. They replaced Dunlavy SCIVa’s powered by one of a variety of amps and speaker cable combinations. I never turned back. Simpler is better. No longer do I need or worry about the adequacy of speaker cabling or amps. 

Your ATC choice is a good one; I believe your will likely enjoy improved sound reproduction. But I agree with @whart, listen to your candidate speakers, preferably in your home audio listening room before deciding. 

Whart, I believe the disorder would be Neurosis. Something that many audiophiles experience.

The ATC SCM 40 are fantastic loudspeakers  and are very dynamic. The issue with your current setup is not enough power to get you the dynamics and liveness you crave.

The ATC three way have a better image, with a stunning midrange that is neutral and clean, good treble detail. 

We became an ATC dealer after hearing the active SCM 40.

Dave and Troy
Audio Doctor NJ

Hello Celtic,
    I'm listening to my ATC 40's right now, but in my case they are the somewhat unusual ATC HTS40's, the same as the SCM 40's but in an on wall configuration. Powered by an Accuphase E-470 with a pair of the small but tight JL Audio Dominion D-108's, they freakin' rock. What can I say? Sometimes I love to open them up and just get carried away. Today it's a selection of Reggae and holy crap, you can't go wrong with ATC if you get that occasional urge to hear some live music right in your own house. Get those ATC's and let us know what you think!
~Oran

No, not unstable, at least no more than the most of us, given the territory.

As far as your ATC's go, it might be worth considering whether if any loudspeaker/amp combos get much better than yours. Exemplary engineering, legendary midrange unit, first class in house customised treble unit etc. I suspect you will lose nothing but gain a lot in terms of bandwidth and dynamics. As far as kick-ass speakers go ATC are up there with classic high end JBL's.

The SCM40 SMA  not only an obvious contender for one take on the current state of the art, but it's also one massively favoured by many, many recording/broadcasting professionals.

@lowrider57  Yes, and hardly surprisingly it's also something that many try to foster and exploit. Just look at the most common type of ads compared to those from yesteryear. They promise nothing, and suggest everything.

Which of us has not been taken in at some point? Until you realise and accept the limits of what is possible in audio you will never have peace of mind and always be at risk!

Many experienced audiophiles feel that in real terms little progress outside loudspeaker design (and some fans of Quad, Klipsch, JBL, Tannoy DC's etc would even dispute that) has been made in the last 50 years in both the fields of recording and playback.