[quote name='Jack' timestamp='1489238928' post='3255388']
With pedal preamps there can be a volume issue. The pedals have a rather limited amount of gain they can provide for a few reasons, mainly that they're limited by the 9V power supply but also they're designed to work in front of standard amps rather than power amps. You'll get sound either way, but I've seen the pedal output volume maxed and the gain controls on an amp maxed and still the signal LEDs are just barely being tickled.
You really have two options, one is to find an amp with the lowest input sensitivity that you can, ideally around 0.775V. Option 2 is to use another gain stage to boots the pedal before the power amp.
If you use the RBI you'll likely have a wider choice of suitable power amps.
Oh sorry, I should answer your question. QSC PLX??02, pick the one you feel you need. I have a 1602 that does 300W a side into each of my Barefaceds, and the possibility of 1600W into both if I wanted. They have either a 1.2V or 1.7V input sensitivity I think, depending on the model, so you may find your RBI will sing and your VT Bass a little on the quieter side.
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What about going into a pedal (Sansamp, BD 121 etc), taking a line out into the mic premap on a passive mixer, then into a poweramp? Might be a daft question.