4 ch amplifier for sale Nov 28, 2009 10:45:09 GMT 8 Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by peterng8 on Nov 28, 2009 10:45:09 GMT 8 Hi, got one 4 ch amp for sale, Quadt Audio QA4100 for sale , used slightly more than a year.. in very new and excellent condition..reason for sale is upgrade.S$200(negotiable)www.banleongbros.com/car_products/quadtaudio/quadt_qa4100.htm