Although in the former years the Digital Signal Processing state of the art improved quickly, not always is a must to install a DSP. All our Amate Audio systems are launched highly calibrated after a deep R+D process that aims to easily solve the different applications of our product range. Nevertheless, using an external DSP would be necessary in the following cases: Sound systems with passive speakers in applications where, due to room acoustics or type of music, corrections of the frequency response are needed (equalization) Sound systems with passive speakers for touring Fixed installations with different audio zones Hi-Impedance installations with either speaker intelligibility or SPL requirements If you are still not sure about getting a DSP, you can ask to our Application Engineers.