Live and recorded are two such completely different animals...
Some of the best sounding recordings (of any kind) I believe are the old RCA Victor CSO/Reiner recordings... I think those were done with THREE mono recorders and THREE single microphones.
Now, every digital everything aspires to sound like that. It's so incredibly backasswards!
Rock records aspire to sound like Back in Black or Aja, Jazz records like Body and Soul.
...just like every orchestral tuba aspires to sound like the Chicago Yorks.
This all said, tuba is a difficult instrument to capture, it's acoustic properties take a *lot* of care. a LOT. ...and worse, few engineers understand it.


