I've used the db924 quite a bit, with EUB and EBG. Usually, I leave the tone controls off, once in a while I'll boost the low about three clicks, if the situation calls. So I think that it's a good pre to use with EUB, since the 10meg input impedence gives alot of headroom.
Not so sure about mounting it on an instrument though. I'd shy away fromthat. I leave it on my pedalboard and power it with an external power supply, by using two 9 volt battery adapter cables (18v) into a Voodoo Lab Pedal Power Supply. Just can't stand using all those alkalines. I ended up with about 20lbs worth of half used batteries to take to the recycle.......
The Aguilar doesn't sound as good with my acoustic bass, not sure why. So I don't use it for that situation.