I plugged the optical into my tv the coax into my satellite receiver. I have a bluray plugged in to my tv with external speakers set to on. my dav-is10 sounds subpar. i checked the tv audio and the components and set them all to the highest possible sound. is there a setting i can change on the home theater unit to enhance sound. do i have an eq? raise, lower the base or treble or middle. i cant find the right setting. sound doesnt turn on until it gets to volume 60. any suggestions?