gimmeheadroom
Headphoneus Supremus
great mental image!
Objectively, some DAPs have adequate power output specs, and DC power from a battery is quite clean. More space in a desktop amp can lead to more ultimate potential, but you might be surprised what portables are capable of. Headphones from a portable... don’t knock it ‘till you’ve tried it!
I stand by what I said. A lot of times something could have enough power on paper but even a lot of those case are because you didn't read the specs closely enough or because of insufficient detail. A lot of devices will drive the 600 or 800 loudly enough and based on that the guy between the earpads could conclude everything is fine. But it's not. There is something about these cans that causes them to sound lifeless when they don't have enough, quality power. I have seen it with several DAPs (no, I don't claim to have experience with every DAP in the world but it remains irrelevant) and even some desktop gear. These headphones need a good amp and if you don't use them with one you are throwing your money away to look cool and that's why I wrote the analogy.
Is anyone running their HD800s out of speaker amp terminals or is that overkill for 300 Ohm headphones?
The impedance of the headphones is not even the major determinant of how difficult headphones are to drive. The key metric is the sensitivity (how loud does the headphone get at 1 mW for example). The Hifiman HE-6 needs a speaker amp even though it is rated at 50 ohms because the sensitivity is very low, around 84 dB/mW.
The best type of amp for 600/650/6XX and 800/800S is a healthy tube OTL amp. Big solid state amps will also do well.
TL;DR don't expect to drive serious money on headphones and run them off your DAP or laptop. It will seem to work, but you will still have no idea what they're capable of.
The 600 and 800 are so good that it's almost impossible to throw too much amp at them. And by that I mean clean power, not just off the back of a receiver.
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