The WA 2 is just as suited for the HD800s as the 6SE, in fact some would say its even better. The design of the WA2 caters to high impedance cans, which is what the HD800s are. The numbering system Woo has isn't logical. The 2 isn't at the low end of the spectrum, its actually $40 more than the 6SE. The key difference is that it is about the nicest OTL amp most people are willing to buy.
But yeah a WA6 will work just fine with HD 800s, just be sure to get the Sophia 274b or it won't do them justice.
http://wooaudio.com/products/wa2.htmlFrom Jack Woo himself: (The question being which is better for K701s)
Hello David,
Thank you for your interests.
You are correct the 6SE offers much power to spare which is desirable for
harder-to-drive headphones such as the AKG's. It is up to your personal
sound preference to choose either the WA2 or the 6SE. If you look for tight
control, great dynamic control, speed, and attack, the WA6-SE is the best
choice. If you like a warmer, relaxed, smooth sound, the WA2 will work
better.
Please let me know if you have further question.
Best regards,
Jack