Hi and thanks to all in advance for your help. I checked through previous posts and didn't find exactly what i need to ask so; Does anyone have experience using either of these with an URB? Aside from the fact that they are both big, bulky, and expensive. I own a Cal blonde II and use it with acoustic guitars and Mandolins and have heard and read that you can play an URB through it with no ill effects. I have played my 53 Kay C1 through the Cal Blonde II and it does have a good sound to me; but not tuned specificly for an URB, and I don't want to damage it. I'm thinking of purchasing a SWR Natural Blonde Acoustic Bass Amp but don't see a lot of feed back on them. I have played through a Natural Blonde and like the fact that you can really dial in the sound you want. Any thoughts?