Ashworth makes a complete bridge for EUB, wit piezo's in a kind of hollow piece of wood. I have one, it works. They're expensive, though. On my AUB I have the Realist (NS/David Gage), which is really great (I replaced my Underwood for it, and it needs NO preamp!). As a matter of fact, it works with the 'solid' parts of the acoustic bass (the - I don't know the word in English - 'tone-bar' on the E-side of the bridge & the bridge itself, under which it is placed. I'm curious: what would it do between a bridge & a solid body? Good luck with it! kind regards, Remus Aussen, The Netherlands,
http://beam.to/latrenza