Carver M1.5t vs. Krell or ML

Hello again. My screen name might ring a bell, as I recently initiated a discussion re updating my bookshelf speakers. For those keeping score at home, I’ve narrowed my search to Dynaudio Focus 140’s. Crap shoot without an opportunity to audition, but that’s the leap of faith I’ve got to take. We’ll hear as it goes.

So, I’ve got a Carver M1.5t, that’s literally still in the box, after a multi month sabbatical at Hi-tech Audio, Ltd. in WA state. Top to bottom refurb. I’d owned a Phase Linear 400 for decades, so the M1.5t was an easy choice when a very well cared for example became available.

The rub, is that after weeks of lurking about these parts, my long dormant interest to upgrade is making itself known again. Coming back to the fold as it were, I find there are older Krell and Mark Levinson amps that I could actually afford, at least pre-owned.

Obviously I’ll never be confused for a true audiophile, but I do value/appreciate good “stuff,” but only to the extent that it will provide at least some degree of sonic improvement over what I have now.

My preamplifier is a line stage CJ PV-12. My main upstream source is a semi-respectable, Adcom GCD-575.

Am I suffering from amp envy or is there a case to be made for an “upgrade?”