I too was a little puzzled about the differences between ANV3 and ANV3 se besides the 50% price increase.
I emailed Blox and here is their response (unedited):
"ANV3se is different from ANV3,bacsically they both sound quite similar.
Since they use the same driver,we tried to improve sound quality for ANV3se
by improving a dynamic,speeed and flat frequency responce,we lose some
weight for all frequency rage though,but it is worth it."
So in a nutshell, ANV3 and ANV3se both use M2C housing and the same driver (which is built with TM7 diaphragm but a different magnet).
The tuning is different which means dampening material or wire or soldering material could be different.
If anybody has ever cracked opened an earbud, the amount of solder or dampening material is equivalent to at best a few cents.
Since cabling has already been improved for the ANV3, I doubt there is a new supper-dupper cable for ANV3se which would warrant the $30 price increase.
Personally, I don't really understand what "losing weight for all frequency range" means. Maybe it's less bass weight and less forwardness in the treble. Basically less V-shaped and a little flatter response curve. That would put the ANV3se somewhere between the ANV3 and TM7.
The fact that from a cosmetic standpoint there is little to no difference between an M2C with an engineering change, an ANV3 and an ANV3se makes it pretty hard to assess the value of Blox earphones. The sound improvement might warrant the price difference but without a clear explanation of what Blox tweaked, it's pretty hard to assess. Frankly, it seems more logical to think that given the demand Blox saw on ANV3, they wanted to cash-in on it and quickly relaunched the brand new ANV3se at a much higher price (BTW just below the psychological price point of $100) with minimal changes. In absolute, the ANV3se might still be worth it at this price point but when you can get a Creative Aurvana Live for $60 or an Hifiman RE-400 for $100, it would have to be one hell of an amazing earbud with much improved fit and finish.
Blox might have little competition in the earbud niche but its pricing tactics, on-and-off availability, confusing marketing and poor built quality doesn't yet warrant the price they are asking. They should get a steady supply on a few models with stable design covering low, intermediate and high price points. Just with that alone they would be able to amortize their R&D expenses over more units and learn how to assemble the earbuds faster and with greater quality. That alone should increase their margin and make it a better business to the benefit of its owners and client base.