Problem with RPi3, HifiBerry DAC+ and Luxman L215 amplifier

Hi, i have a problem with my system sound. I have a RPi3 with HifiBerry DAc+, im using Volumio. When i connect the RCA DAC`s output on my auto-Amplifier speaker it works OK, but when i connect the same output to my Luxman Amplifier i only hear noise. I dont know what is the problem, can you help me??


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