2 RCA transformer balanced inputs
2 XLR inputs
2 pairs of binding posts for speaker outs
pair of 3 pin combo jacks for XLR/single ended outputs, 1 single ended output is +/ground, the other is -/ground
1 4pin male output
1 4 position input selector
1 4 position gain selector (1, 2, 3, 4)
1 24 step attenuator, 4 channel dact.
Par Metal case (the cause of 90% of my headaches, their diagram doesn't match the case)
Front Panel Express front panel