Input--------The 192 8-channel ADC card has two 8-channel DB-25 input jacks, one for +4 levels, and one for -10 levels. The jacks can be selected in software channel-by-channel, so you can minimize repatching. Each ADC channel also has two separate gain trim pots, again software selectable channel-by-channel.Output---------The 192 8-channel DAC card has one DB-25 jack for +4 outputs. The outputs are balanced and do NOT automatically sense balanced/unbalanced connections If you want to run unbalanced, just use the "+" leg and leave the other floating. If you want -10, you'll need an external pad (but we have a cable with integral pads available). The outputs also have two trim pots per channel for two different headroom presets, selectable in software, channel-by-channel