I recently installed my new receiver and set it up as 5.1. All 5 speakers are working except for the sub woofer. The sub woofer was working for the first hour, the sub woofer quit mid song. No changes were made to the settings and the music in no means was loud. I had tested the sub woofer on other receivers and it works fine, I have also tested a different sub woofer on this receiver with no avail. I have gone through all the trouble shooting in the manual, Sub set to yes, LFE ON, frequency settings, etc. I have also reset to factory default and it is still not out putting anything to the sub. I am at a loss at this point. Any help would be appreciated.