Make sure you're hearing sound from all the speakers, especially the center channel if you're talking about movie sound. I wouldn't think it's the HDMI cables. If you're getting picture and sound, the cables/connections should be good.
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Main HT <> 976 <> 7200 <> Ultra-X12 <> sapphire ST2 mkII RF/LF <> sapphire SC center
sapphire ST2 mkII SBR/SBL <> sapphire SS SR/SL <> Verizon/DVR <> Vizio M70Q7 <> Oppo UDP-203 <> Amazon 4k Fire TV