Type: piezo
Mode: passive
Preamp: –
This pickup gets permanently installed into the bass bar side bridge foot. For installation, the leg gets cut off and the piezo inlayed into the wood – this needs a qualified luthier.
What looks like a preamp on the photo is a small passive (no batteries!) EQ unit that gets mounted to the tailpiece. This tone filter cuts off high frequencies and offers 4 presets (2 switches), suited for arco and pizziciato.