Greetings. Does anyone happen to know what the difference is between the DirecTV Plus receiver's and Non-Plus receiver's? Is is a hardware change, or is strictly a matter of the HU cards vs the H cards? I was a former DirecTV customer and recently purchased a Plus System in order to obtain the Local channels in my area. However, the current Plus receiver I have doesn't have a AC-3 output. I still have my RCA DRD515RB AC-3 (non-plus) receiver from 2 years ago, but I'm not sure if it can receive my local channels or not. DirecTV told me that I'd have to send the H card back to them to obtain a HU Replacement card in order to use this receiver. I'd like to use the receiver if possible, instead of buying their DRD480RE which is the Dolby Version of the new Plus Receivers. Any insight would be appreciated. Thanks in advance!