Thank you for posting your question on Just Answer! I will be happy to help you with this problem. Can you please give us some more information so I can better answer your questions.
-How is the cable box hooked to the tv?
Please give me this information and I will be happy to assist you further.
Can you try hooking the cable box up to the tv with something other than HDMI to see if it still has the problem please. We need to do this test to determine if the problem is HDMI related or general audio.