DAC+ output too low

Recently bought DAC+ with jack phone and installed it on Pi B+ with Volumio (1.5).
When I connect it on amplifier, need to strongly increase volume level on amp, from normal -50dB (100W amp) when I listen other sources as CD player, TV and iPhone, to -20dB when Pi was my audio source.
Double checked with two power supplies (2A both), and other amplifier+loudspeaker conf with the very same result.
Quality of sound is satisfactory, but this disbalance in volume level is not. Any help?


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