so basically I have the logitech z-540 sound for my laptop but since my room is a bit big the base doesnt make any big difference. I got 2 big surround speakers (used to belong to an old big stereo - they have 3 speakers and bass each one). They connect to the stereo via a normal rca cable a wire and another wire which is divided in 2 copper ends.
How can I connect everything to my laptop?
You need to connect the laptop to a power amp, or to your existing stereo amp, then it can supply audio program for your amplifier.
How much would it cost on average? and if I buy one, I can connect 2 surround and the z540 to the amp and connect the amp to my laptop?