I have been looking for a decent way to set up my speaker system and havent really found what im looking for yet. I would appreciate anyone that could tell me a great setup for my speaker system.

This is what I have acquired over the past year for about $300

I am using a Mac book pro and itunes to listen to all my music.

I have 2 logitech z 5500's
2 logitech z 2300's (Just the 8 inch sub's)

so total I have 4 subs and 10 speakers (5 speakers each for the logitech z 5500). its in a 8 by 12 foot space with tile flooring and brick wall so I can def feel the music but i know i can get more out of what i have.

i have a 3.5mm cord coming from my macbook to a Rolls HA43 Pro 4 channel headphone splitter. (all 4 systems are connected to the Rolls because it allows for 4 splits.)

I have thought about getting a better amp but cant really seem to find one that is going to split into 4 channels like the rolls. Also im thinking about getting a digital to analog converter?

Let me know what you guys think. It is very loud but im new to this so i know there is probably a better setup. Thanks