True 4K requires a specific bitrate (usually 25-50 Mbps). Pirated "4K" rips are often compressed to 2GB, destroying the audio-visual fidelity. You lose surround sound and gain compression artifacts.
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A: Not necessarily, but 4K files usually come with 5.1 or Dolby Atmos audio. A basic soundbar enhances the experience significantly over TV speakers. True 4K requires a specific bitrate (usually 25-50 Mbps)