Us amps 3 channel

Just acquired a us amp 3 channel? Not sure the model amazed by the lack of information. Any help is appreciated on identifying it.

Currently has output but only when the rcas are plugged into 1 of the sets of input (not sure of both are inputs yet but I believe 1 is a pass thru)

1 channel had no output the other 2 are low medium range (not as loud as i would expect)
 

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