Depending on placement, I use nearfield active monitors, KRK Rokit 5 speakers. They approximately 2 feet from my head. I am using an old Angstrom 200 surround sound pre-processor which incorporates an excellent sounding dac. I connect from the computer with firewire to an M-Audio firewire to spdif converter. M-Audio also makes some excellent sounding speakers for computers. My subwoofer is a Martin-Logan Grotto that cost about $700. Or you can get a KRK 10 inch subwoofer for about $400, which I plan to do. The cheaper 'audiophile' subwoofers are not very good and should be avoided. Better to spend more on the speakers for better bass.