The model of my Hughes STB is GXCEBOT D.
This is my first excursion into HT so I've added all kinds of things to my system. However, when I hooked up the Yamaha, I only had the speakers & the digital optical cable coming from the Hughes hooked up to it and the results were the same. No need for video. This is an audio problem only.
It seems to be program specific. The program may have that warbling sound coming out of just the rears. Another program the fronts and the rears. A commercial might come on and sound great. Other programs have good sound across the front and absolute silence in the rear. My instincts are telling me that this all has to do with the way a program was recorded or is being broadcast (Mono, Stereo, DD etc.). The front always remains clear and dominant.
I must reiterate that you have to put your ear up to the speaker to hear this, that it's in the high frequencies, and voices seem most effected. But any amount of distortion is unacceptable in my book.
My satellite signal strength seems to be within specs (above 60, most running in the 80 or 90s). I'm currently trying to see if there is any correlation between transponder strenght and audio quality but it doesn't look promising.
The Fox News Channel (O'Reilly Factor, Hannity & Colmes etc.) seems to perpetualy have this problem. I get good strong sound out of the center and warbling out of the other four speakers. What do you or Charlie hear when you tune into that station (pro logic surround)?