Happy Camper
Headphoneus Supremus
One could argue that the HE-560 is also a very special headphone, but I get that a fully-driven HE-6 could be superior...
I am just not convinced achieving that is worth the price, hassle or especially effort, looking at some people's 'dedicated' HE-6 rigs.
I spent $0 for a pair of speaker amps I had in storage. I made a cable to use my headphones with speaker wire terminals. I've heard better speaker amps but it's more than adequate for the cost. Don't be jaded by the "" freaks with all that iron but my limited experience has shown me that the better the component's power, the higher the performance. The devices that push performance over cost are commonly more expensive on initial purchase. But amps are an analog technology that hasn't changed much by way of transformer and cap. usage. The better power supplies are not cheap but the old gear that does have it can be had at great value for return. And they can drive any headphone, not just the HE-6s and speakers.
The overwhelming "urge" to provide a headphone with a headphone amp and the power of suggestion is strong here. I'm a recovering gear addict that discovered some alternate routes to this journey. Now I've some gear that's pretty much useless (detours) and more respect for the intrepid DIY and tuner spirit. With better performance, one may discover their favorite music badly recorded but the good stuff is spectacular. Damn you Head Fi, it's been fun.