Comments by "Perhaps" (@NoEgg4u) on "TOSLINK: That one consumer fiber optic standard" video.

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  2. Fiber optic cables provide galvanic isolation that RCA cables do not -- and it matters. Why? The host of this video correctly states that either the digital data gets there or it does not. That is true. But as our courts say when you take the witness stand "Do you swear to tell the truth, the whole truth, and nothing but the truth?" In this case, we heard the truth, but not the whole truth. Line nose that travels through RCA cables will accompany the digital signal into the DAC. That line noise will be picked up by the analog section of the DAC. Yes, CD players have an analog section. CD players create sound from scratch. They create sound from reading the zeros and ones and making it into an analog sound that eventually makes it to your speakers. So RCA cables (especially crappy ones) are a conduit for electrical noise that breach your CD player's (your DAC's) internal components. And line noise is bad for sound reproduction. You might be thinking "I hear no line noise". Well, if you took steps to eliminate the line noise, you would notice an improvement in sound quality. The music would reveal inky black backgrounds. There is low-fi stereo equipment. There is mid-fi stereo equipment. There is high-fi stereo equipment. Each of the above has tiers. All of the equipment that the host used in this video is "low-fi", and the lower end of low-fi. That is why, to his ear, cables make no difference. The equipment he is using is equivalent to the testing equipment used in a lab. If the lab is using equipment that is not suited to the test at hand, you will not obtain meaningful test results. Such is the case when this host compares poor cables using poor equipment.
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