Hi everyone! I want to spend ~350 usd/euros on headphone dac-amp. I am considering the Topping DX3pro+ and the Topping EX5 – to be paired with a Hifiman Sundara, a Sennheiser HD560s and a Moondrop Kato.
I was testing the DX3 but there is a hum as soon as I connect the Kato, not with the...