I have airport express connected to my Onkyo sr 605 A/V Receiver with a digital toslink to optical audio cable. I can hear my music from iTunes crystal clear except there is no BASS. The only bass is coming out of the small woofers on my two front left and right speakers. My sub makes no BASS, and there is no sound coming out of my center channel or left or right rear speakers. My question is, should I be getting BASS out of my subwoofer with my digital optical connection to my airport express or not? Also, will I be able to hear that sound out of all 5 of my 5.1 speaker arrangement or just the front left and right? Thanks in advance and would appreciate any and all help.