> Okay but I'm guessing that what you're hearing is not actually "surround sound" - but
> rather 2x stereo - front left and right replicated on the rear speakers and low
> frequencies automatically directed to the sub.
He may also be getting matrixed Dolby Surround, the VHS-era precursor to Dolby Digital. It generates rear content from the difference between the front left and right, and it generates center from content that's equal on both front left and right. It's better than nothing, but it's far from taking advantage of the capabilities of that setup.