said by kes601:If there was not tv or a router in the rooms when FiOS was installed then the installer would have had no reason to install a bigger splitter and as was stated, the more splits, the bigger the signal loss.
I know it varies by ONT but when I got mine installed (2006) the signal out of the ONT was so strong they put attenuators on the line. The same result could be managed by using a 'too big' splitter.