http://www.pioneer-mea.com/en/productview.php?proId=94&subId=90&catId=46&m=feature
http://ae.kenwood.com/Car_Entertainment/Power_Amplifiers/KAC-M845
http://www.sony-mea.com/product/xm-gtr4a
which one is the best? the prices are almost same for the three amps....
