BLUESTiCK Marine offers the same features as the standard BLUESTiCK, but instead of an internal preamp, it is delivered with our external preamp PRE-A II. This preamp has been specially engineered and designed for durability to meet the demands of hard working musicians and to be a perfect match for SCHERTLER transducers and active loudspeakers. An innovative circuit which is very stable, thanks to the choice of high quality components and to the external regulated DC power supply as well as the class A discrete design concept with volume, bass, treble, gain and a unique resonance filter, all adjustable externally, are already the reason of its success.