Supported Channels: The more channels a receiver supports, the more speakers can be attached to your system. 5.1 Channels (meaning 5 speakers & a subwoofer) is the minimum for true surround sound, while more expensive systems can be 6.1, 7.1, or even 9.1 channels. Stereo receivers support 2 channels (left & right).
THD: THD stands for Total Harmonic Distortion. Which measures the amount of change in harmonic content of the signal as it is amplified. A lower figure indicates less change or a cleaner sound and a more accurate amp.
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