A line level mixing desk that satisfies the highest professional standards. Two different modes of operation are possible: dual or mono. In dual mode, a total of four stereo sources can be mixed down to one stereo output; in mono mode there are eight inputs available, which can be mixed down to two outputs. All inputs and outputs are balanced with high-quality transformers and designed for professional line levels. The input gain is adjustable up to a maximum of 20 dB. An LED for each channel indicates when the working level of +6 dBu has been reached. The output gain is also adjustable and delivers an additional boost of 10 dB max., for a total possible amplification of 30 dB through the PRM-SIGMA 8.2. A five-point LED strip provides reliable optical monitoring of output signal strength. All inputs and outputs are equipped with a ground-lift switch. Additionally, it is possible to isolate the case from the electronics ground.