the t.racks DSP 4x4 Mini, Compact 4-Channel DSP, Inputs: 4x 6.3 mm jack balanced, Outputs: 4x 6.3 mm jack balanced, Programmable via USB, Power supply via external 12 V DC power adapter (positive polarity inside), Weight: 0.6 kg, Dimensions: 160 x 150 x 40 mm, incl. power supply and USB cable