Jude has heard the HE90's on just about every amp out there,including mine,so I'm sure he has a rock solid idea of how they sound.IMO and others,the HE90's have never been a grab you by the nuts,wow kind of headphone,like say the R10.It took lots of time with them for me to fully appreciate what they bring to the table.I do agree with Spritzer though,they can sound good in most systems but they definitely do not sound the same on every amp.Gary