At the moment, I have a stereo system in my room. It has a "Realistic STA-740" that works perfectly. Attached to the speaker "A" output are 2 x "Teledyne Acoustic Research AR28s" that have amazing sound considering I found them in the attic last year. Attached to the speaker "B" output are 2 x "Panasonic Thruster SB-300C". These aren't as amazing. Though they have (according to spec sticker on back) two 5.5" 'hi-efficiency' woofers and an 8" passive radiator tuned to 30Hz, I can never get this done properly, as the speaker has a maximum power input of 20W and has an 8 ohm impedance. Does anyone have any experience and/or parameters and/or suggestions about all these three parts?