http://www.dact.com/html/passive_preamp.html http://www.dact.com/html/passive_preamp.html Passive preamp (passive volume control) http://www.dact.com/html/passive_preamp.html http://www.dact.com/html/passive_preamp.html http://www.dact.com/html/passive_preamp.html http://www.dact.com/html/passive_preamp.html http://www.dact.com/html/passive_preamp.html http://www.dact.com/html/passive_preamp.html http://www.dact.com/html/passive_preamp.html