^Yes, Nick was very cool about adjusting gain until I settled on -6 for my IEMs and recordings.  I shipped it back to him and paid at least shipping back to me.


If you have sensitive IEMs, I recommend starting at -6 and taking it from there.  Maybe others have some other experiences?

Excellent, thanks! I'll contact Nick about having my Leck retrofitted with the ADA4627-BRZ (B1) and the gain dropped 6dB. Now I'll have to start looking around for an economical solution for my full-sized headphones.

FWIW, I preferred the Leck with many full sized phones, too.. HD800, HD650, HE-560, etc.  If you're in a pinch, you could do a helluva lot worse..and those phones will remain pretty damn resolving even with this 'modest' amp (it isn't).  Hell, I preferred the Leck w/ the HD800 over the Valhalla 2 in some cases (cleaner, faster, more resolving treble.. but V2 tubes do matter).

I sense the Geek Out V2/+ would be a nice option for full sized cans since it's got adjustable gain, class a, etc. etc.

FWIW, I preferred the Leck with many full sized phones, too.. HD800, HD650, HE-560, etc.  If you're in a pinch, you could do a helluva lot worse..and those phones will remain pretty damn resolving even with this 'modest' amp (it isn't).  Hell, I preferred the Leck w/ the HD800 over the Valhalla 2 in some cases (cleaner, faster, more resolving treble.. but V2 tubes do matter).

I sense the Geek Out V2/+ would be a nice option for full sized cans since it's got adjustable gain, class a, etc. etc.

This. The Leckerton with 4627-1B makes life very, very hard for midrange desktop amps. Every time I'd get a new amp in - Vali, Magni 2 Uber, Asgard 2, Gustard H10, fuck even Project Ember - the Leckerton made them have to justify taking up room on my desk.

Apparently the V2/V2+'s are shipping ahead of schedule, so we won't have to wait long for a comparison  

That's exactly it: I've been so impressed with the Leck, I've made it my desktop unit. It's more or less pushed the EF-6 to the side, so I plan to sell the latter. My worry is that if I retrofit it for IEMs, it might then be lacking when I try to drive the LCD-2.2 or HE-500. Hence my starting the look for an amp for full-sized cans. Of course, if the Leck should still have enough power after having been retrofitted, then I won't need a new amp. At least until I pick up GO V2/+. The GO450 with the Leck is so serious.

Is the Leck with the 4627-1B significantly more powerful than with the 8610? The listed specs with the 8610 are less powerful than the GO450, but with the 4627-1B on high gain, the Leck drives my LCD 2 to quite a bit higher volume than the GO 450 on its own. This leads me to believe that the Leck is more powerful, but I could be completely mistaken in my understanding that more power equals more volume.