These are a lot more complex than a clock radio.d I unno about your particular unit but, in general, one needs to go through some sort of setup procedure to tell your unit what speakers you have and don't have.
The first line of defense here is your user's manual. If you don't have one, you can download one here under the "support" tab. Happy reading.
Plus, trying to set up one of these hairy beasts without a remote can be cumbersome at best,and impossible at worst.
