For along time I've been looking for the mythical preamp that perfectly matches the piezo pick ups on double basses. I'm a cheap mother****er so I always thought a preamp was something with a 9volt battery and a 2 band eq.
The Focus III I recently bought seems voiced really flat like a mixing board and not too well matched to the Full Circle or other Acoustic Bass pick ups and I had heard Marc Johnson playing thru the Avalon and sounding damn good.
Anyway I bought the monstrous thing the other day and I can say this much, I won't mind schleping it anywhere. this is the perfect match to both the Focus III and the Full Circle (and probably any piezo)
This box has basically, one instrument line in and a bunch of ways out, but in between it conditions the sound of a piezo like nothing I have heard (except its big brother the 737) I cant imagine getting a better sound out of this piezo, it thickens the sound and rolls off exactly what needs to be rolled off. $500 seems like a whole lot to spend on a preamp but it frees you up to plug into ANYTHING to power it: amps, boards, PA's, recording and it is finally a preamp that isn't "secretly voiced for guitar" but doubling as a bass preamp like the Solstice, Gigpro, Focus, etc. Its a huge box as preamps and Di's go, and there is a bunch of stuff in there (it says "Hi Voltage" on the front) and it just does this one thing (that I've always been looking for something to do) really really well.
The U5 into the Focus allows you to keep the Focus flat and just use the much better voiced eq curves in the U5. The first EQ curve sounded the best on my bass with a drummer: the most acoustic and thick with no nasal twang, no mid wirey mess. 3 and 4 sounded good too and I can see changing for different rooms and flat was beautiful.
Unfortunately the Focus and Avalon are designed in opposite configurations( one narrow and deep the other wide and shallow) they seem really awkward sitting on top of each other. I wish someone made half rack bags so I could mount them together.