Yes, for the most part - I'm not sure what the etiquette is for listening to your headphones on an amp that's been set up by a headphone manufacturer to show off their headphones...
If you mean a desktop amp that needs to be plugged in, I doubt it. The vendors have limited table-top space and there isn't really much space to add more chairs, typically.
Auditioning so much gear all at once can be tiring and overwhelming: it's all too easy to bounce from one audition to the next and lose track of what you thought of that pair of headphones you heard three hours ago (what were they again, I've forgotten?!). I take breaks between auditioning gear to give my ears a break. I use that time to jot down some listening notes. I also come up with a list of gear I want to hear in advance.
Empty your bank account.
"What's inside?"
Although this is off topic, from first hand experience I would strongly recommend using headphones with good noise cancelling for listening when riding the NYC subways. And with all the other noises and distractions of subway riding an external amp provides little benefit since listening while on the subway does not require audiophile level equipment. Something like the Sony WH-1000XM4 used with a mobile phone and Bluetooth or a digital music player (like the Sony NW A45) and wired will work great while on the subway.
Thanks for this tip. I have a pair of Sony WH-1000XM3 and a Sony NW A45 player which I've always used with a wired connection and with noise cancelling on. I just tried the two using Bluetooth and it sounds great! Learn something new everyday.
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