I think we need to clearly define what night and day is. Also to keep things in it's proper perspectives I'm taking about 1. Orthos, 2. portables. and 3. A fully balanced 4-channel B22 which gives you double of everything, voltage, CURRENT witch the orthos loves, and slew.
Night and Day:
Telling the difference from one sound to another sound Immediately.
When I listen the my Mad Dogs on my B22 I get some of the very best sound these headphones can putout (IMHO) I then put my Mad Dogs on my iPod and I can immediately tell the difference between the two - Hence: Nigh and Day - *Immediate*
Now If I go from my B22 to my M^3 - No it's not a night and Day difference. I have to take some time to tell the difference between the two.
Lets use you scenario but alter it a bit. The HE-6 on a speaker amp is a night and day difference than the HE-6 on a portable. Same thing applies here. As soon as you switch from one to the other you would be able to tell the difference immediately. HE-6 on a speaker amp vs. the Lyr you may need some time to tell witch one is witch. Not *immediate* there for not night and day.
I do apologize if you guys can't tell the difference in something like this. It's really simple. Do the test your self. I have.
The simple clarification of what night and days is clears up the misunderstanding.
Too many interpretations of audiophile jargon. haha