ADAPTATION of the mixer to any stage. SELECTION of 3 input levels. OPTIMIZATION of the use of the MASTER potentiometer avoiding output saturations. RESPECTS the dynamics of the original program avoiding the “hissing” effect. CALIBRATING IN SITU of great simplicity. NO DISTORTION OR ALTERATION of the original sound. Dimensions: 2 19” Rack units. Weight: SAP-10: 2.7Kg SAP-20/SAP-20S: 4.1Kg. SAP-20 Features. BALANCED (inputs and outputs). Automatic ATTENUATION (-12dB) for excessive input levels. SAP-20S Features. BALANCED (inputs and outputs). NO automatic DIMMING.