I recently purchased a pair of HD650 and an ODAC/AMP with 3.5mm outpot. I'm currently using an 6.3 female to 3.5 male adapter and worried about quality loss. I know there's no audible difference between 3.5 and 6.3 but I got the impression that a longer jack would eventually lead to quality loss. Is it true? Should I get an aftermarket cable that has 3.5mm jack?