Tried looking for an official thread for this but couldnt find one. When I go through all the settings and turn on the subwoofer it still wont put any signal to the sub. I called denon and went through it with them and still couldnt get it to work. I also have another 787 and it does the same thing. When i hook up my hk everything is ok. Both were bought brand new and used for whole house audio and neber had a sub connected to them. Wasnt sure if this was a known issue. Thanks.