it is switched to the proper selection? If it is and it still not working then maybe you should try the 3.5mm connection on the front (not the RCA).
Hello I'm new here and I need your help! I bought SMSL SA-60 amplifier to connect my Dali Concept 2 book-shelf speakers to the computer. I have connected the amp to the computer with RCA to 3.5mm jack, to the line-out (the green one) on the computer.. I turned the volume up and there were no sound.. I turned the volume all the way up, both on the computer and the amp.. if I put my ears up to the speakers I only can hear a tiny bit of sound... Please can somebody help me!?!?

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