hi....m usin sony dav-dz390k dvd home theatre system which is connected to ma pc through co-axial connection.when i play some dolby featuring(also dts) files everythin is proper....but when i play mp3 files there is no output from the centre speaker ....pls help....m usin onboard sound card...ma mother board is gigabyte ex 58 extreme .....also comment abt ma speakers :lol: