Fishman Prefix Plus TM Set/4Bd Z.pream /Matrix 2.3mm Piezo

3-band EQ, with the standard fixed shelving treble and bass controls, and then a parametric mid control--the "Contour" slider. The Frequency slider lets you choose which mid frequencies to boost or cut (from 250Hz-10kHz). You then use the Contour to control those frequencies.

The Prefix Plus adds several other features. The first is a "Brilliance" control, which is just a fancy name for the high end of the frequency spectrum, in the >10kHz range. Boosting these higher highs can add a bit of shimmer or brightness to your tone. To make room for the Brilliance slider, the Frequency slider (for those parametric mids) moves to the bottom of the preamp. The next important feature of the Prefix Plus is the notch filter knob, located on the top left of the unit. This knob cuts, by a fixed -15db, any frequency from 40Hz-500Hz. This, combined with the Phase switch, offers much more effective feedback control than the regular Fishman Prefix 2,3mm Matrix Piezo