hey all.i got a question regarding my homr stereo.before i ask let me tell you what i got.my stereo is a 3 layer technics.:fm/amstereo tuner st-4 a stereo integrated amplilfier su-5a and a stereo double cassete deck rs-1w.i love my music and i want more power from it.it aint but a 120 watt stereo if i remember correctly with two channels.im a big fan of the bass.i listen to mosyly heavt metal and rock.could someone help me as far as to tell me how i could increase the power ?