The Onkyo HT-R290 is a receiver, not a power amp. It has several inputs on the back you could use to connect your devices with the necessary cables. Or, a simple way to connect your phone would be to buy a Bluetooth receiver that plugs into one of your receiver analog inputs with a cable and transmit the music wirelessly from your phone or computer to the Bluetooth receiver. If the computer doesn't have the capability to transmit Bluetooth but has a headphone jack you could use a cable that has a stereo mini plug on one end to fit the headphone jack and two RCA jacks on the other end to plug into the analog audio input on the receiver. Same with the phone, if it has a standard headphone jack you could use the same cable to plug it in.
