i i recently got 3 celestion drivers one 12 inch one nine inch and one horn tweeter (i think). all of them are 8 ohm. im planning on building my own cabinet for them . only problems are i have no idea what kind of power amp i would need to get moderate to high volumes . also i have no idea what kind of crossover to get? the units model numbers 12 inch t4957 9 inch: t4854 tweeter: tw9912 any help is appreciated thanks.