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Each series builds on each other. Both of these series are 4K UHD, have HDR10, HLG, and Dolby Vision support, have a Roku operating system, wide color gamut, auto-game mode, CCZ technology, an edge-to-edge glass display, QLED technology, mini-LED technology, etc. The 6-Series also features THX Certified Game Mode and more. You can also visit www.tcl.com/us/en/products/home-theater/6-series and scroll down to "Compare All Models" to see all models compared. Hope this helps! Thank you, TCL Customer Support
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