You could get a set of attenuators instead of splitting the line so much. Find just the right amount by switching out the attenuator.
http://www.ebay.com/itm/Lot-7-Cable...757978?hash=item35cdc8d61a:g:LOoAAOxyrM5TISxY
http://www.ebay.com/itm/Lot-7-Cable...757978?hash=item35cdc8d61a:g:LOoAAOxyrM5TISxY