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I'm wanting to know if it's possible that it is causing picture/quality issues.
and would getting a single cable fix this,
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Yes, it is possible that a connector can cause picture issues. Or it could be wire gauge. Or it could be the source of your video causing issues. What picture issues are you having?
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should I get HD or regular
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What do you mean by "HD"? By default, HDMI (High Definition Multi-media Interface) is "HD". I would look at Monoprice and buy a single cable in the largest wire gauge that meets your budget. I use a 35 foot cable to connect my projector to my equipment rack. I could have probably gone with 25 feet but I wanted a little flexibility in where I mounted the projector.
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with or without ethernet?
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Do you need built-in Ethernet?