You may also want to check if the Yammy is set to allow output to the sub. I am not sure how bass management is currently implemented in the Yammy. Previously, when you are using a sub and the LFE/Bass out is set to both; frequencies from 90Hz – 20Hz are sent to the sub, as well as the speakers that are set to Large. If you set the LFE/Bass Output to Main, then frequencies from 90Hz - 20Hz are sent only to the main speakers, only if the main speakers are set to large. If the main speakers are set to small, then only frequencies from 20Khz – 90Hz are sent to the main speakers. If all speakers are set to large, then the LFE/Bass Output is mute. You would need to be sure that the sub is allowed to get something.
John
