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When considering the selection criteria for purchasing a home theater system, the video card with HDMI output is paramount. An HDMI (High-Definition Multimedia Interface) output on the video card ensures that high-definition video and audio can be transmitted from the computer or media source directly to the display and audio system without any degradation in quality. This capability is crucial for achieving the best visual and auditory experience, especially when streaming high-definition content or gaming with high-resolution graphics.

While HDMI cable length, soundbar compatibility, and wireless streaming capability are also relevant considerations in setting up a home theater system, they are secondary to ensuring the video source can deliver the required quality. The HDMI cable length matters only after the necessary output compatibility is confirmed, as it relates to the physical connections. Soundbar compatibility is important for audio output, but it becomes irrelevant if the video output does not support the desired quality. Wireless streaming capability allows for convenience but is dependent on the ability of the video card to handle the transmission standards effectively. Without a capable video card facilitating high-quality output, the overall performance of the home theater system could be significantly compromised.