This on usb cables

Again, that [that's] 'some' problem. : ) 

No it is not.  He might believe that "some" expensive cables would sound better, but would not necessarily believe that all expensive cables would sound better.  Logic is a tricky thing.  ;)

It is. Especially when one leads with a belief system and simultaneously speaks of / for another's future experience. 

@kuttler  Borrow some USB cables from your friends or dealers or the lending library that The Cable Co. offers. Conduct the comparisons for yourself. There are a number of strong performers out there...read the various threads to lock into one or more. 

Just yesterday I replaced the stock cable with an AQ Carbon 3 meter to connect my 10TB external hard drive to my Cambridge 851N network player. I was mainly motivated by the need for a longer cable, but I’d been surprised in the past so I thought I’d try a (relatively mild) upgrade. Instant improvement in sound—better sound stage, better clarity, maybe a little better bass. Not night and day, but I’d do it again in a heartbeat. The Cambridge goes through a Marantz AV8802a to Bel Canto ref 500Ms to Dali Mentor 6s. Nordost and Morrow cables. So my mid-fi system detects a change USB cables, go figure.