Re-read my original post. There is such a thing as having too low of a transmit level. I've seen it with CBR telephony modems, voip modems, and regular modems.
As I alluded to originally, if you have absolutely no idea as to what sort of levels you are dealing with, err on the side of caution and send half of all the signal coming to your home to the modem.
But the contention that doing this is necessary in all situations, is ridiculous. Especially when responders are telling posters to send half the signal to a modem and then AMP the other outlets. These are the same people that think 15dBmV is better that 0dBmV.
I don't know if that applies to me but when it gets warmer, people with 5 outlets or more will most likely need an amp. It's been like that for a while now.
Actually for cable just "basic" 2-99 analog can be fine with up to 10 splits, since it can generally go to -25db without any notice of picture quality. This also varies with the size of a tv with bigger tv's i would say 32" or bigger no less than -9db but lets say you have 1 split for a modem right at a 2 way splitter, then a 8 way splitter you should be good since most 8 ways are -8db each leg. Now this all varies with length from tap to tv, signal from Ground Block to Tv and also if you have Digital ( Which I have seen Scientific Atlantic converters go to -14db and still not pixelate/tile and still go 2way
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