You really give us no information, making it hard to help.
My guess is that it is one of the following, in order of likeliness:
1) You are using the low impedance XLR inputs, and your signal source is unable to drive them. If so, try the 1/4" jacks.
2) Whatever follows the Eclipse is being overloaded – try turning down the output.
3) (Least likely) there is a hardware fault in the Eclipse. If you think this is the case, contact your dealer or email@example.com