Just got a low-end Onkyo receiver for the bedroom (TX-8255). FM radio sounds great, but when I tried connecting my iPod or laptop to the receiver with a 3.5mm to RCA cable, the sound is muffled and shitty. Am I doing something wrong here? I was playing high-quality audio files and tried each of the inputs on the receiver. I tried two different cables as well: a cheap one and an expensive Monster cable.