Watt Gives?

@speakermaster   I have owned maybe 25 amplifiers manufactured between 1976 and 2000.  While I will say that amplifier design has not significantly improved since then,  the quality of parts has,  outputs transistors, capacitors etc.  I find that while there are some awesome classic amplifiers out there,  A good amp designer today has the advantage of lower distortion, better quality parts than was available in the vintage gear that you continually rave about.  

I have owned a Belles Aria, it is a very well designed amplifier. It does have solid bass, smooth, detailed midrange and good extended top end. 
The amp design is one of Dave Belles's better.  What I believe that you are mistaking for volume is Dynamics,  the 75 watt per channel Aria punches way above its weight and does sound more powerful than most because of how dynamic it is.  

@ctwith3    Those amplifiers were owned across the years, even now.  I just rebuilt a Sumo Polaris and a GAS Grandson,  both with very high quality parts and they both responded very well.  I'm surprised how good these old amps sound.  But I've had 3 different Sumo's, a couple of Gas, an old Coda, Classe, Parasound, Kenwood Mono's, Kenwood stereo, an Edge, Yaqin, YBA, Heathkit (still have AA1600), 2 - PS Audio (200c & Delta), a Hafler DH-500, Kinergetics, a Marcof, an old Arcam.... right now that's what I remember.  
Actually,  these were mostly all decent sounding products. The Kenwood mono's were L07m's.  I enjoyed those, but afterward, I bought a Basic M1, I did not like that, also had a Parasound, don't remember the model, employee purchased it in 1980, didn't love it.   Again,  these are all pre 2000 models.  
I'd love to hear the Virtuouso.  I had an Aria integrated a couple of years ago, it was a huge value and very nice sounding piece.  I just built several Class D amps and am rotating 2 of those in and out of the system with the Sumo and Grandson.  I am currently using a SST Ambrosia preamp that I really like.    Not sure this answers your questions,  but there you go.