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Each series builds on each other. Both of these series are have a 4K resolution, HDR10 support, and a Roku operating system. The 5-Series additionally have Dolby Vision Support as well as a wide color gamut. You can also visit www.tclusa.com/products/home-theater/5-series and scroll down to "Compare All Models" to see all models compared. Hope this helps! Thank you, TCL Customer Support
Sorry, there was a problem. Please try again later.All I know is this tv is amazing. Who can really tell between 4 and 5 class?
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