I thinck that if you had an adequate context,( pre-amp.-speaker combination) assisting your Cary 2a3 monoblock, it would be, I believe, next to impossible to preserve this quality of sound, coming from an integrated
On a overall scale thought, an integrated of a certain design, can sound superior than a seperate of a different design, even a vastly more expensive one.
This point, is based, on my actual personal experience. Yet, lets take Martin Collom, wich as reviewed components steadily with HI FI News (Britain) for well over a dozen years, and use the result of his sound quality point system with witch he score each pieces under review, on a absolute scale. regardless of price, genre or practicallity.
Lets use the Cary CAD LX20 SEi, (KR 300 BLXS), witch is the highest scored integrated by him at 35 points, ( not its remote version scoring less at 29 points) to show that even quality "seperated" can be equal or surpassed.
Cary CAD-572 SE monoblock, 35 points
Conrad Johnson Premier 8a monoblock, 33 points
Krell FPB 300 stereo,33 points
Bel Canto SE 40 stereo, 28 points
Audio Research VT 100 stereo, 21 points
Cary SLA70 mk11 stereo, 20 points
Sunfire mk11 stereo, 14 points
On the other hand, an integrated version of its same monoblock version should always lose in the comparaison, as it was the case here when Collom scored the CAD LX20 SE MONOBLOCK at 50 points, (his highest score for an amp.that I know of, althought not for a pre-amp, as the Conrad Johnson ART got 55 points.
I believe, that, if your speaker as kept your little 4 watts monoblock under-performing as they most of the time do, then the Jadis integrated will be more plaisure to listen to.