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Each series builds on each other. All of these (4, 5, and 6 series where this is posted) series are 4K UHD, have HDR support, and have a Roku operating system. The S525 and R625 additionally have Dolby Vision Support as well as a wide color gamut. The 6-Series also has CCZ technology and a brushed metal cabinet, and more! Hope this helps! Thank you, TCL Customer Support
Sorry, there was a problem. Please try again later.My on-line research indicated that as one moves up from Series 3 to 4 to 5 to 6, the picture quality improves, but so does the price.
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