Hi Joe,
You would connect your receiver to the AMP300 with an RCA and your subs to the receiver's LFE outputs.
Alternatively, you could go into the AMP300 from your receiver into Line 2 input then out of Line 2 output to your two subs with a sub cable splitter. Keep in mind, however, that you would not be utilizing the LFE feature with this setup.
CL/MA 1521