This product was made overseas, I understand there was poor quality control. It does not operate correctly with 2 - 8 ohm mains and 2 - 8 ohm monitors. The passive mics clip on the high gain settings with the slightest volume so I am forced to run them at low gain and have to turn the output level to maximum to get sufficient volume. I am only miking vocals mind you and they will not cut through without the volume at max which causes the mics to cut out if I sing too loud. Do not buy this product, they should have been recalled but were,t, I am finding many people are having the same problems and worse. MACKIE, come back to USA!