I have a Washburn AB-20 but I have not recorded with it much.
I pretty much used the same DI (SansAmp) as for my electrics but I was never happy with the SamsAmp alone on my electrics. Since I got the ART TubPac I run the DI into it and my electrics sound great now. I have not tried the acoustic this way yet though.
To answer your question about the Acoustic preamp...wich acoustic preamp do you have?
Most of the acoustic/electrics use piezo transducers with a built in pre-amp on the bass for your bass amp. I would think that any decent mic pre would do OK for recording.
If you have an
acoustic guitar pre (wich is what I am assuming) that would also work for boosting the signal and would be designed for the higher impedance of the piezo's
but your EQ on the pre would be preset for optimal guitar frequencies and may not be of much benefit to you.
I have not read any articles on acoustic bass gutiar recording and only heard two albums/CD's that really featured a studio recorded (not the live "unplugged" ones).
One is The Violent Femmes CD wich has a killer but unrefined sound and the other was by some German Jazz bass player - I forget his name - but he did alot of chords etc and that CD did not do much for me...I like jazz but it was kinda too right brained exploring theory and did not connect with me inspirationally.
Any way what exactly do you have and what are you wanting to do with it recording wise?