I thought you said it was working?? Either run an auto calibration or manually turn the sub on in the settings. i do not remember what they are off the top of my head but you should take a look at the manual. If you do not have it you can get it from yamaha's website. What sub does he have anyway. I want to look at it.
Sorry I thought he did have it working. But anyway, the sub is a Sony ss-wmsp66.