I just purchased a set of JBL LSR30X Speakers, and connected them to an Onkyo A-9010 amplifier, which I then connected to my phone. The speakers are connected to the amp using two XLR to RCA cables, and the amplifier is connected to my phone using a 2x RCA to 3.5mm jack. When I am listening to music, turning the volume, bass, treble, and balance knobs has zero affect on the audio. Am I missing something? Is it because I'm not using the right connections? Any help would be appreciated, thank you. Ciaran.