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Hello there! Thank you for reaching out. The main differences between the LG OLED48C4PUA (C4 series) and LG OLED65B4PUA (B4 series) models are primarily in the processor and sound quality. Processor: The C4 series (OLED48C4PUA) features the α9 AI Processor 4K Gen7, which provides superior AI upscaling and enhanced image quality, making it better suited for handling more demanding content like high-end gaming or 4K video. The B4 series (OLED65B4PUA) has the α8 AI Processor 4K, which still offers excellent picture quality but is a step down from the α9 in terms of processing power. Sound: The C4 series has the α9 AI Sound Pro (Virtual 9.1.2 Up-mix), offering more immersive sound quality with virtual surround sound. The B4 series uses the α8 AI Sound Pro (Virtual 9.1.2 Up-mix), which is also great but may not be quite as advanced as the C4. Size and Resolution: The C4 series is available in a 48-inch size, while the B4 series comes in 65-inch size. Both models offer 4K Ultra HD resolution and HDR support (Dolby Vision, HDR10, and HLG). Power Consumption: The C4 series consumes about 176 kWh per year with a 94.3W power consumption, while the B4 series consumes 232 kWh per year with a 125.7W power consumption. This makes the C4 slightly more energy-efficient. https://www.lg.com/us/tvs/lg-oled65b4pua-oled-4k-tv#pdp_specs Both are fantastic OLED models, but if you prefer a more advanced processor and better sound, the C4 series would be a better fit. For a larger screen, you might consider the B4 series. If you need more details, feel free to contact us via @LGUSSupport on social media. —Renzo
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