First amp really wasn't it was a pyramid eq/ booster with like 10 eq bands and said 50 x 4 that like thing was loud on 4 pioneer 6x9 coaxs then first amp was a pyramid PB 1000 4 channel bridged to two 10 pyramid woofers with the eq booster still hooked up that set up was loud for 1985 it would even move a tee shirt hung in the window of a 1980 cordoba it all cost about 400 with the hu which was a pioneer super tuner lll