Hey peeps, I have a Spider IV HD 150 Head and Cab. For some reason when I plug in both Left and Right 8OMHS cables I have very low volume - max master and channel gives me a similar volume to an ipod on 50%. When I plug just the right 8OMHS cable in to the head and cab I get full volume so it seems to be an issue with the left input (left/phones). Has anyone else experienced this before. Is there any fixes without sending the head away. Only 2 years old.