Orion XTR 400.4 (99' or 2000')

[nvme 10+ year member]

I lost my manual, i'm trying to bridge it to my components, problem is that when I plug the rca's in I'm getting signal to both sides of the components even when I plug just one channel in. I've messed with the 2chann/4channel input button and can get it to work correctly but then the other channel does not sound very good. Amp runs fine in 4 channel mode. There are some switches that i'm not sure what they do:

st/sum/mono - I figure that is to select the input signal to the speakers - but what setting do I want for bridged mode?

Also, when in bridged mode which input do I use? front left or right and rear left or right?

Thanks.

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