Hifonics ZRX2400.1D 2400W Max Class D Monoblock Zeus Series Amp why is this amp cheaper than this amp when it has more watts?http://www.onlinecarstereo.com/CarAudio/p_23917_Hifonics_HFi2000D.aspx?utm_source=google_shopping&utm_medium=Product_Feed&utm_campaign=google_shopping_Price_Comparison&gclid=CJWA1ePc27sCFUjNOgod5DgAdw