I know there are hundreds of bass players who use a Tech21 SansAmp or similar to improve their sound.
If you do you are are likely inserting it between your bass and a typical bass guitar amp...if its any good it could cost a bundle.Think about it, The SansAmp has an XLR output to go to the board either live or in the studio where it is the only source used for the recording.
The Sans Amp is a preamp....for live all you need is a good power amp. Why not bridge the Art SLA-2 into mono...that gives you 560 RMS...that's real watts...not the published BS the bass amp companies give you....peak watts or blah blah watts.
In short you save a bundle and improve your sound quality by not going from pre amp to the basses preamp to amplifier.
It's a no-brainer....better sound...more power...cheaper price!