the present invention is a stereo pa amplifier that is mounted inside a desktop computer . it is powered by the computer &# 39 ; s 12 - volt power supply and receives its input via a stereo mini cable from the computer &# 39 ; s audio line out . standard 8 - ohm , non - powered speakers are then hooked up directly to the board via its speaker connector board . the volume of the present invention is adjusted by the computer &# 39 ; s volume controls . the device eliminates the need for an external stereo amp and external mixer , which thereby reduces the installation time , cost , interconnecting cables , and the space needed for the overall computer system , while at the same time providing quality sound .