I set my rav at 160 hz,0 phase and volume up 40 percent,set my m-80's to small and the sound is awesome!the m-80's have incredable mid-bass detail and the rava can belt out some really tight low bass with great detail. the only thing about the rava I don't like is the amp won't take sastained loud volume and the amp gets really hot and cuts out. I went threw two of them with the same problem and decided to live with it.