There are a few things that I'd start with. Make sure the volume level of SMS-1 isn't at zero. Make sure the SMS-1 isn't muted. Make sure that you are connected to the connection identified as "RP12" on page 6 of the Outlaw SMS-1 guide . And if you are using the SMS-1's test tones to verify that the system is working, make sure you've connected the SMS-1's EQ Output to an input on your receiver, set the input to "analog" and "stereo" (don't need any surround processing), and set the mains to "small." I don't know how many of these you've already done, but that's what I'd start with.