Splitting a signal reduces the signal by a certain amount (typically noted on the splitter itself). In a digital world, inadequate signal can result in unpleasant artifacts, or simply an inability to get a channel lock whatsoever.
Figure that on average, before adjustment, enough signal is sent into each resident to support about seven devices (which is roughly equivalent to six splitters, including all those inside the walls, hidden from your view). In many cases, if you have more devices than that, and start having signal-related troubles, the service provide may require you to buy an amplifier to boost the signal inside your home. (I was required to do so; it is not uncommon.)
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