I just bought one of the older RS units that I was talking about today. Last one on the shelf and not on clearance. This rather large RS store had at least a half a dozen before Christmas.
Anyway, pulled a composite video with left and right analog audio off the back of my E* 4700 in the basement (late, great HT effort that's now never used) and connected it to the RS Stereo Modulator. Hooked the coax out to it with the other end going to a Sony 27" TV in the second floor bedroom. Results? Well it sounds better and the PQ even looks better. But, with the old A/V 2-channel receiver up there and a lack of good stereo separation on any of the shows on at the time, I can't prove that I'm getting stereo out, just better sound and video.
I previously had used the RF-out of the 4700, which the 4700's manual states does not output a stereo signal. Sound was flat and video was, at best adequate.
Which brings me to a question about RF Modulators. Since the unit is modulating the video input to RF, does it make any difference if that input is composite or s-video? I thought about pulling an s-video stream off the 4700 for the modulator's input, but that is more effort for me and I didn't think it mattered. Any RF modulator/video signal experts out there?