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I, as many others have stated, am rather annoyed with Massdrop for saying they couldn't make the first one have the RCA in and 1/4" out in the first iteration because it "wasn't allowed" but I went ahead and joined. Then lo and behold a week after getting it in the mail, they magically can do it now. Like seriously, what the heck? I would have jumped instantly the first time if the desktop version had been offered even with the price hike. Very, very poorly done Massdrop.
Actually, I'm pretty sure that the O2's design license explicitly disallows derivative works. Not sure what's changed, as I don't think anybody has heard anything from nwavguy for years now.
Thats correct, nwavguy does not allow changes to O2 without his approval, and i doubt that massdrop got in contact with him. Maybe they found a different design of the O2 he has already approved of?
"the O2 is offered only under a “no derivatives” license. Put simply, you can’t modify it or use it as part of a different design and then offer it to others without prior approval. This is to help prevent inferior versions of the O2 that might disappoint whoever buys/builds them. Even the PC board design is an essential component of the O2’s performance and changing it could have dramatic consequences. If you want to modify the design, and offer it to others, please contact me first. I’ll be investigating O2 designs offered commercially and alerting everyone if I discover unauthorized changes or performance problems. The idea is the best implementations of the O2 should win."
I believe that refers to the modifications to the circuit itself. He actually recommended an enclosure for those planning to install 1/4" and/or rca jacks in the page you linked. There are even some optional rca and 1/4" Jacks listed in the BOM.