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Both series include a built in Roku operating system, 4K UHD, and HDR Support. The 5-Series builds on this and has additional features such as Dolby Vision, wide color gamut, HDR Dynamic Contrast, etc. You can also visit www.tcl.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.They just keep getting better. The 6 Series is better than the 5 Series.
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