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There is very little difference between those two models. The M51a-H6 offers a better latency performance and reproduces a more extended low-bass output. The M51ax-J6 supports up to 7.1 channels of PCM audio, while the M51a-H6 only supports 5.1 channels.
Sorry, there was a problem. Please try again later.From my research The M51AX-J6 sounds better and is a upgraded model
Sorry, there was a problem. Please try again later.To answer your question, I want to gather a bit more information. When you have a free moment, we are available through text message, chat, or over the phone. Just go to support.VIZIO.com and click on ‘Contact Us’.
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