I am a self appointed audiophile extraordinaire and a self appointed football expert⚽ 👍😂 I bought my Walnut F2 on AliExpress for £23.29. The supplied charging cable stopped working after 2 charges. That went straight in the bin🗑️. On first use there was a crackling sound audible in-between tracks. This has turned into a humming noise after a few weeks use. This noise may be unique to my unit as another owner on head-fi told me that he does not hear any noise on his F2. The noise doesn’t annoy me as such. I just know that its there. I listen out for...