Ernie824I really didn't like the V5i-D in my XD-05. It will not operated in hi-gain mode, and need that for the HE4XX cans. Yeah, there was more detail, but the music was much more fun and punchy with the stock op amp. So, just beware of that when you think about doing the V5i-D. I actually have 7 of the Burson V5i-D op amps in stock. If anyone wants one; $49 shipped in USA. I'm in Florida