Not sure if it's been done, but has anyone who really cares actually asked Charles if he's done any tests? It would be better than nothing if he had some.
Than a reasonable question appears. Why Mr. Altman didn't published any measurements if he has spent so much time developing this product. Now don't get me wrong, I did read his DIY blog and all most of his articles including mother of tone and R2R dac explanation. But today audiophiles more often prefer to see measurements of products they are about to buy soon. Don't want to start the debate on how can bias and marketing can have a placebo effect. I do believe that Tera is a good sounding DAP according to many reviews here and there. But it would be nice to see such a technological product to be measured on a precise audio system (not some cheap sound card RMAA tests). Especially if you consider your product a truly hi-fi grade with a steep price tag.
Regarding of DX100 and es9018 in general I wasn't referring to whether DX100 is better then Terra. I've tried to explain that DX100 might be far from good regarding es9018 implementation. Also it will be damn hard to make a good and compact es9018 design with a big battery life.