I am having some problems finding information on what sort of equipment i need for my active speakers. Do I need a preamp or DAC? I have a pair of jbl lsr305s that I want to use as computer speakers and can connect to TV. Would an amp help with these? I saw some have headphone amps in them to, I think it was fostex hp-a3 or I read that wrong. Cant find right list of what I should get with these.