what's 'Active preamp' vs 'Passive preamp'?

I thought all preamps are passive in nature, and I heard the term 'active peamp?

what does it mean? how they are different?

eandylee06-21-2007 6:37pm

pubul57 Details Discussions Posts This discussion Message User 3,712 posts 10-28-2008 at 02:32am Copy Comment URL Report Comment Edit Delete Ralph, is "controlling the interconnect" impedance matching or something else?