Piezo pickups produce a high impedance (Hi-Z) output, while most amps and audio mixers are designed to accept a low impedance (Lo-Z) input. The impedance difference, if not corrected, can result in "noisy" signal being sent through the PA and a very unsatisfactory tone.

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It should be noted that a preamp may not be required if you intend to connect to an amplifier that is designed to accept a high impedance piezo input. Most acoustic instrument amplifiers (including Fisman Loudbox-seriesAcoustic Image, Roland AC-series, Kustom Sienna-series) have this feature and eliminate the need for an impedance matching device such as a preamp, however, a preamp is still recommended for greater EQ and tone coloring control. If you intend to send a passive signal directly to a sound board, then at the very minimum you should get a basic DI box (direct input), which will provide the necessary impedance matching, but nothing more. Better still would be a preamp such as the ART Tube MP, which would also provide gain control. Above that, there are many preamps that can also provide equalization (important for tone control) and feedback resistance functions. Our favorite preamps are the LR Baggs ParaAcoustic DI and their Venue DI. The ParaAcoustic DI cleans and boosts signal while matching impedance as a DI unit. It has 5-band EQ (equalization is super important for tone coloring) and great feedback resistance functions. The Venue DI performs all of the same functions as the ParaAcoustic and includes an excellent visual floor tuner (that doubles as a mute switch) and a 1-to-9 db solo boost switch.  This video highlights both LR Baggs preamp models...
  To assist you in choosing from our selection of preamps, here is a listing of some of our favorites: