I bought an NX4 earlier this year only to have it rattling on arrival. I cracked it to see what was up and found that there was a spring-loaded chassis ground pin that had liberated from the board. So, I warrantied it.
Upon receiving a second, the same failure happened within weeks. So, I've returned that one.
Has anyone else had problems with this component or rattling NX4s? I'm shopping for a new solution, but it feels like the alternatives at this price point all come with compromises.
That's the only listening test I give my DAC's... Does it rattle when you shake it.
Sorry yours have been failing!