I seem to have trouble with Dacs going faulty and not be able to get them repaired or makers that refuse to honour guarantees. Maybe I shouldn't buy from Ali Express! What seems to happen is I buy a dac advertised at 230v and when it arrives it's a 220v model. I have two dacs from Ali that share the same symptoms ie sound through my speakers like the wind blowing in the trees! My two broken dacs are beautifully made and are just dacs with no additions like head phone sockets or bluetooth. When they were working they sounded very nice so I wondered if they could be brought back to life by someone with the digital knowledge? Does anyone know of anybody that could perform this service?