Interesting little experiment, I like the B15 the most, the higher notes still sound too "DIish" with the REDDI, although not as much as the Countryman. I would be interested to hear them in a full mix, my guess is the B15 would be easy to pick out but the rest would all sound too similar. I have to say that I also prefer the sound of the JDI over the countryman too, maybe because i just dont like the sound of an active DI with passive basses.