After developing concerns that my VT-Bass would not be able to properly drive a Crown XLS Drivecore power amp properly (1.4V input sensitivity) I took the advice of TB'er rpsands and looked into doing an output mod to boost the output level of the VT. I took my VT down to Condor Electronics in Seattle, which is a place I've never dealt with before, but my stepdad had nothing but wonderful things to say about them. I dropped off the VT yesterday and got a call back today. "Hey Chris, I talked to the guys at Tech 21 and they won't release a schematic for your pre, so I'm not going to be able to do any kind of output increase for you. The engineer did say he was shocked that there would be any problem driving a power amp with one of these as most of their complaints are for additional attenuation rather than a higher output. One thing you might try is converting the output of the pre, which is unbalanced, to a balanced signal. Since the 1/4" input of your power amp is looking for a balanced signal, this will give you a 6db increase. I'm mainly interested in the second paragraph of our conversation. I'm in over my head when it comes to this sort of thing, so if someone can chime in and answer these questions it would be super helpful: 1. Will sending a balanced signal really net me a 6db increase when it reaches the power amp? 2. I've got a Radial JDI that I use frequently. If I send the 'thru' output from the JDI into the power amp's 1/4" in, will that be giving me a balanced signal, or does the 'thru' output of the JDI not go through the Jensen transformer and remain unbalanced? 3. If the 'thru' output of the JDI won't do the trick, would I be able to run the balanced (DI) output of the JDI into the XLR input of the power amp, or will the DI output of the JDI be down at mic level rather than line level?