You mention you put the analyzer on the audio outputs of the DirecTV, which implies analog type outputs. That being the case, I wonder if the digital stream, either via HDMI, Toslink Optical or SP/DIF are carrying a full spectrum signal.
Any chance you could try the analyzer on the pre/processor outputs to see if the brick wall is there as well? In that event, we could rule in / out whether they're stripping the spectrum or just doing something with the analog output section of the DTV box.
Any chance you could try the analyzer on the pre/processor outputs to see if the brick wall is there as well? In that event, we could rule in / out whether they're stripping the spectrum or just doing something with the analog output section of the DTV box.