Next you should connect the wires from your
loop system to the speaker terminals on the receiver. If you
plugged your input into the "right" input, make sure
to connect your loop to the "right" speaker output,
if you chose "left" for the input, make sure to use
the "left" output. Seems silly, but it is one less
thing to troubleshoot later if you make sure its right now.
Just before hooking it up you may want to
check the continuity and resistance again to make sure everything
is correct. Also make sure there is not a lot of strain on any
of the wires or connections.