An AV receiver is like a Swiss Army Knife, with just about every tool you could possibly need. With a plethora of inputs and outputs and preamplification responsibilities, it acts as the hub of your system. It has amplification for your speakers, advanced audio processing for surround sound, the ability to pass 4K (and now even 8K) video signals through its HDMI connections, and, in most cases, calibration technology that lets you significantly improve performance by tailoring itself to the acoustics of your specific room.
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