With RR BARR Country Band I like to use my 1969 Sunn 2000S with my Ampeg SVCPL rack mounted Preamp on smaller stages.
Double R Barr's guitar player A/B's between his 1967 Sunn Sonaro and Gibson Gold Tone.
Playing bass as a "Hired Gun" demands a flexible sound. I like the Sunn 2000S. Its great in a Blues or Jazz room as well as country or Rock music. Its great for that Classic Rock sound on a small stage.
In my home studio many drop in guitar players plug into my 1968 Sunn 1000s. It sounds great through a 4 X 12 cab. They use there guitar's volume control to change from clean to absolute balls to the walls dynamic.
RRBARR Website
http://www.rrbarr.com/rrbarr/index.html