Now that I have more time with Ak70 I can provide some early impression. To me AK70 is a solid low entry DAP with features appealing for those who like to have of a 'higher end' DAP without really wanting to spend that kind of cash.
Locally AK70 is priced 750 USD, to me sonically isn't worth that price. If one is aiming for sound alone options like dpx1/opus 1 dap provides a far better sound, a sound that to my ears best the even higher price AK300, which is position as the lowest of the AK3xx family. To me the appeal of AK70 also isn't for its USB out but what is capable of in its weight and size. The USB out of AK70 is far too noisy to be honest and early impression is not good when paired with HUGO. Despite the early false report of AK, which has been corrected now, AK70 lacks optical out so guys bare that in mind AK70 only offers USB out.
Testing the USB out of AK70 with DP-X1 ignoring the stability issue the sound to my ears is a lot less dynamic. DP-X1 offers a far more detail and dynamic both from headphone out and USB Out.
So what is the appeal of the AK70? It is the lightest portable DAP of its kind which offers a high end features, albeit not all useful, but it is truly pocketable. The appeal of AK70 is in its portability. Paired with the right earphone AK70 can offer hours of great listening session. I can see myself take the Ak70 out far more than Lotoo, dpx1 and my other dozen DAP. AK connect for me is enough to keep this dap. Not always I like to connect my player to my laptop just so I can add an album, it feels good that I can do that on the fly using AK connect and my local NAS.
So in summary if you are buying the AK70 to pair this with Mojo/HUGO or any other DAC/AMP and expect a high quality USB out I urge you to compare the AK70 USB out side by side with something else. Only than the difference is obvious. Without any comparison, which to me is a good sign, AK70 deservedly produce an allure of high quality sound and it has the right to do so.
Don’t expect a giant killer however for its size it provide great raw power. Can Vinnie perhaps release its full potentials? Time will tell perhaps.
As is AK70 is the best ultra portable with a high equality lower tie player which perhaps price higher than what its sound offers. It would have been great to AK70 to would have been a direct replacement of AKJr with the same price, as to be honest AKJr feels a lot more sturdy than AK70 but AKJr is way too laggy for me and it still lacks the feature that AK70 have.
I am yet to try the apex bluetooth, tomorrow I will try to pair it with my local wifi speakers and report back.