ADTech, you are correct about Terminating Resistors. Most people don't bother to use them.
Ratman, why don't the OP just use a 4 way splitter? I never thought a Cable Modem needed a strong signal. Just asking.
Gar face, I got my splitters from tselectronic.
(LCD - Sony KDL -52 XBR4) (Receiver - Yamaha RX-A1040)(Blu Ray - Oppo BDP-83) (PS3)( Comcast X1) Speakers (L & R - Paradigm Studio 20) (Center -Paradigm CC-470) (Surrounds & Back Surrounds - Paradigm SA-15R in walls) (Subwoofer 1 - Sunfire HRS-12) (Subwoofer 2 - Paradigm PW-2100)