I have searched the net and through the forums (although I confess I haven't read the entire woo owners thread) and I haven't really been able to find many detailed comparisons of the three amps. In fact, the 3+ isn't even on woo audio's website.
Additionally, there seem to be a lot of (oftentimes unadvertised) modifications and upgrades to be done. I am assuming this is what the wa3+ is to the wa3 and there's also the PDPS mod to the wa6. I am sure there must be more!
Maybe we could try to turn this thread into a reference for prospective woo audio customers. If there are lots of good replies (as I'm sure there will be) I will try and keep everything organized and updated at the top.
1) What are the differences (sound, features, driving ability, headphone compatibility, etc) between the three models that aren't necessarily featured or explained well on the woo audio site.
2) What are the different modifications and upgrades you can order with your amp that aren't on the site and, if possible, explain the impact on the listening experience and give a price range for the mod (if you know it).
I saw a lot of posts where people regretted not getting a certain mod done because they didn't know about it at the time they ordered their amp, and I figured maybe this thread will help alleviate that and lead to more customers getting the wa amp they really want.