I have been using My 73 concert bass with a David Eden xlt 410, and fender jazz bass and it sounds amazing. the tone settings i have been using are
Bass -7.5
Treble- 5.5
Mid - 2.5 (jazz bass's have a lot of mid)
volume - around 3-4
I have also been using a 72 fender bassman 100 2-15, with what ever speakers Traynor use to put in their 2150's model cabinet.
2-15 cabs do sound awsome with the concert bass.