From a brilliant company ‘Artec’ ...This acoustic instrument Pre-amp / Equaliser is suitable for use with any acoustic instrument that is fitted with a transducer / piezzo pick-up. The Artec SE-OE3 is a three band equalizer / pre-amp offering Bass, Mid, Treble and Volume control. It was originally designed as a multi purpose eq for piezzo pickup use, but with its wide input range and high impedence it can be used with many kinds of musical instruments. Because of low noise and high output, it can be controlled with a wide range of input signals. Supplied complete with an optional fitted belt clip, screws and fixing key. Takes a PP3 9 volt battery, but can be powered by a separate DC 9 volt power supply (not included) Please see below for more details.

From the brilliant ‘Artec’ company...This electro/acoustic instrument Equaliser / Pre-Amp is suitable for use with any instrument that is fitted with an electric guitar pick-up, electro acoustic transducer or piezzo pick-up. The Artec SE-EQ8 is an eight band equalizer / pre-amp offering plus or minus ten on 8 band widths ...Bass, Mid, Treble. also with slider volume control. With its wide input range and high impedence it can be used with many kinds of musical instruments. Because of low noise and high output, it can be controlled with a wide range of input signals. Takes a PP3 9 volt battery, but can be powered by a separate DC 9 volt power supply (not included) Please see below for more details...