Hi there. If you are running a 5.1 speaker system, make sure your surround speakers are on the surround terminal NOT ON THE SURROUND BACK. the surround back is only for the 7.1 speaker system.
Mingkong is correct assuming that you have double checked your connections - check they are in the right places, it's an easy mistake.
The sub on the other hand is more difficult to get wrong. From the 606 going to an active sub (powered) you should be going "Pre-Out" sub from the Onkyo and LFE channel into the sub.
The only lead here is the RCA lead.
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I have the same problem with the left rear and sub not responding! I just got this reciever
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