Took the Markbass SA450 and One 10 to a two piece yesterday. I did earlier post that I thought the Markbass sounded a little sterile in that combination but I was very wrong, it was great. The baked in character of the tens seem to really help any amp, although the Ampeg V4B/ One 10 combo is way ahead more stunning than any solid state I reckon. I do have a TC Classic 450 coming shortly which will be interesting. I will have the opportunity at a big venue in six weeks to try my "Six 10" - two One 10s in series wired in parallel with my Four 10, can't wait for this. The head will probably be an Orange AD200, or possibly Fender Super Bassman 300 or Trace Elliott V4.....whichever I choose I know the tens will make it sound superb.