[quote name='Ed_S' timestamp='1401098573' post='2459930']
I'm pretty sure I tried the lot, but the setup as pictured was going into the front of the RBI with the DBX in the loop and out to the XLS over XLR-XLR. Wow.. that was a lot of TLAs! The other problem I found with the RBI was that it's not the quietest (or least noise susceptible, maybe) pre-amp out there, so when I tried going jack-jack instead of XLR-XLR and putting a clean boost (MXR MicroAmp) in the middle, the electrical hum was just too prevalent.
Edit: forgot to answer the last bit - I ended up with the power amp full-up and using the level on the RBI as the master volume, even though that doesn't appear to be the case on the picture.
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It's been trial and error here too. I've been looking on Talkbass - consensus seems to be that the RBI doesn't seem to have any issues driving a poweramp - someone from Tech 21 posted on one thread that they recommended running the poweramp on full and using the RBI level knob to control the master volume. Interestingly, going back to my set up, I'm presently running the RBI through the effects return on an Ashdown ABM EVOIII racked head, effectively bypassing the Ashdown pre-stage and utilising just the poweramp side of the amp. I've never run the Ashdown with the master volume (or in the power amp sense, accentuator) maxxed out, so this might be worth trying too. That said, good or not, it's still going to weigh a ton and that's part of the issue for me to look for something lighter.
Personal choice of (Class-D) power amps seem to increased somewhat over the last 48 hours...Peavey IPR2/2000 (£400-ish), Carvin DCM2000L (£499) and the Crest Pro-Lite 2.0 (£549).
P