Just wanted to add that I've upgraded from the xm4 to the xm5 with the 8065 and buf chips. I've been LOVING it. I think the 75ohm option works particularly well with my hd595's. Initially I started using it because the volume was too touchy, but the other day I switched it off to check for sound...

Thanks for the heads-up squid+, I'm still waiting for the two opamps from PD to arrive.

I have both the 8066 and 8620 on the way to me now so i'll give them both a solid run. I have no intention of giving up this amp though, I love it already but just want to tweak it a bit if possible.

I just got done reading this whole thread... I currently own the xm4 and have been going insane reading this. I'm only driving some hd595s but that bass boost totally saved me from buying another set of cans. After reading everything here i'm dying to get the xm5 but instead am trying the...

Is anyone familiar with the Practical Devices XM4 adjustable crossfeed? I have that amp and I like it on some music but I feel like the mid-range gets cut out a bit no matter how I have it adjusted. If I have it closer to full-mono it also makes it feel like the music is inside my head (using...