Hi Alex, I am very interested in the LG headphone amplifier, but something here I was concerning... First, could I use a balanced soucre with XLR output via a XLR cable + XLR-RCA adapter? Does this cause damage to the amp? Second, does this amp comsumed tubes very soon? or it can live with a...

I have a HD800 re-cabled with 2x3pin cable on my WA22. I really enjoy the performance with this combination, though I know it doesn't matter to choose 2x3pin, 4pin, or 6.3mm output on WA22 due to its design. However, there's still a lot of "true balanced" headphone amps which has XLR output...