Several questions. I currently only have a 2-channel stereo setup with the RR 2150. I'm really not interested in HT. However, if I later want to add surround, I assume I can use the external loop input to receive the front LR channels from a surround processor/receiver? The manual states that it can, and I assume this is one function for this feature. Is this the same or similar as the HT passthrough feature you see on other receivers?