@runwell
I really get your sentiment regarding an amp being able to reproduce that live your are there feeling. I have had my share of SS amps over the years and some Euro tube amps as well. These were all mated to B&W 800s.
When I purchased my McIntosh MC2301s (300 watt tubes) and hooked them up to my B&Ws the sound took a leap forward. Bass was way better and the rest of the sound spectrum was also way better. When I sold the B&W 800s and demoed them with the MC2301s, the buyer thought I had subs turned on as the 2301s were easily able to drive the bass drivers.
But, ignorance is bliss. I did not have this live stage feeling with the B&Ws mated to to the 2301s. After hearing the Classic Audio Loudspeakers T 1.5 reference field coil speakers, 101db efficiency, 16 ohms, 18” downward paper cone deep bass, 15” forward facing paper cone mid bass, beryllium tweeter, and Edgar designed horn, at the Capital Audio Fest, wow, I heard it…the live sound and musician in room or you at close on stage feeling. I had been on a hunt for a few years to replace the B&Ws, and found the sound that you mentioned and that of which I never experienced before.
I now own the Classic Audio T 1.5 reference speakers. Mated to my MC2301 tube amps, it is well, like listening to a live music event, exhibiting that live you are there sensation. Recording after recording sounds so much different and much better due to the pairing of these speakers with the McIntosh MC2301 amps that I listen into the late evening and hear my records sound anew. The spatial and acoustic space is so mesmerizing that it seems enchanting to me. To sit back and close your eyes and hear the musician or group in the recording venue or on a stage in your listening room is such an incredible feeling. One, that sadly, many audiophiles never experience to its fullest extent. Myself included with all of my gear over the years.
Bottom line, this live sound feeling was achieved due to better speaker amp matching which gave me this live you are or they are there feeling. I have never heard it before on a home stereo and now that I have, it does emulate what I hear at live venues, that is why I get your point. Once you experience that type of sound, you will have a new reference point in terms of music playback. But, I would not categorically stereotype McIntosh as not having the ability to convey this type of live feeling as the 2301s can do that in spades when matched with the Classic Audio T 1.5 reference speakers. Therefore, it seems amps should be matched properly with a speaker in order to play optimally or else, any amp, will sound like it has flabby bass. That’s been my experience after 35 years of listening.