“Can this TV be connected to a 7.2 Home Theatre system and bypass TV internal speakers?”
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You can configure the Digital Sound Out settings in the LG UHD 85 Series 75 inch Class 4K Smart UHD TV with AI ThinQ® (74.5'' Diag), Model # 75UN8570PUC transmit audio through the Optical Digital Audio Output or through the HDMI eARC port on the TV. The main difference between 7.1 and 7.2 surround systems is that the latter has an additional sub that should give more oomph to the sound. But you should not be fooled. A true 7.2 systems should have two separate channels for the subs, so that the two subs may not be outputting the same signal. Some 7.1 systems may seem like 7.2 systems because they have two subs. But the truth is, the two subs get the same signal from a single channel via a Y splitter. This is not true 7.2, although it might seem so at first glance. A 7.2 speaker system is the same as a 7.1 setup - except it has two subwoofers. The main drawback for 7.2 systems, and even 7.1 systems, is that there is very little support for them in modern media. These systems are not that commonplace and supporting them does not give much return to media makers. Currently, most DVD systems only support 5.1 systems while others can extrapolate up to 7.1. You only get 7.1 sound on Blu-ray hardware, and the content needs to be meant for 7.1 systems. The biggest issue with 7.1 surround sound is that not many movies are mixed with a 7.1 soundtrack (although there are a few). 7.2 systems are even worse off since virtually no media does 7.2. Using it with modern systems, mean that you would still get 7.1 sound since there is no other resort other than replicating the same sound in both subs; pretty much just like using a Y splitter on a single sub channel...^IFV
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