Ok, so if there is a thread devoted, just lemme know...... So I hear that they are very similar (maybe it is the OBP-1), but from what I have heard myself, there seems to be a slight difference. Granted, transparent is how I would describe both, at least flat...... I don't find that the aguilar produces a great slap tone, in fact it really ends up making things sound like a P bass to my ears. The Sadowsky's I have played of course have a slap sound to die for. So, are these pres really that similar? Anyways, my thoughts on the obp-3 are based on pairing with bart soapbars that have a series parellel switch and Nordstrand dual coils with the same. I actually liked some qualities about the obp-3, but just could not get a good slap sound until I turned it off or set it flat. You guys think I am setting myself up for the same thing if I tried the Sadowsky circuit?