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The terms “hi-fi” and “stereo” are not directly comparable as they refer to different aspects of audio technology. “Hi-fi” stands for “high fidelity” and it relates to the accuracy with which a system recreates the original sound, while “stereo” refers to the ability of a system to separate audio signals into two different channels for a more spacious sound experience. Both are important for a high-quality audio experience, so it would be best to aim for a hi-fi stereo system.