Just received my Fiio E12DIY. I've absolutely no need for another headphone amp however I got a E17 DAC and EO9K and love pretty much everything about them. So when I saw this headphone amp I thought "what the heck".
Very excellent packaging and really love that I got the little Tin box containing all the opamps and buffers. Classy. Even better they add an excellent chip puller inside the pouch too. I have a chip puller but it's pretty basic. This is a very nice little tool.
So I turned it on just to make sure it worked before I swapped any chips. Worked great, seems to charge correctly, power light comes on and it made pretty nice music. To first listen it sounded a little thin to my ears.
I specifically bought the MUSES01 and MUSES02 based on thread inputs from here. I rolled a MUSES02 through my CMOYBB and it just didn't work in that circuit very well at all. But the MUSES01 worked famously (after adding another 9v battery).
Anyway I was worried that I had a bad MUSES02 so I rolled it in the Fiio E12DIY first. WOW! I didn't change the buffer at all. Whatever was in there is staying for now. I'm not even inclined to change the MUSES out. I like it just like it is. I'll spare you any serious review because I'm still on my first album but this MUSES02 seems smooth as butter and sweet.
To my very big surprise I installed the MUSES and slid the case closed. No grinding necessary. It fits. It just plain old fits. Fantastic.
I'm a HUGE fan of the CMOYBB but I think the E12DIY betters it at least based on what I'm hearing. My source is an iMod iPod from Red Wine Audio (4th generation) and all tracks are Apple Lossless.
I honest to God feel like there isn't much reason to roll chips beyond this. If it gets better I would hardly be able to believe it.
What a fantastic concept this is. An amp with swappable components for fine tuning the sound to your tastes. How can you go wrong and why aren't more manufacturers doing this?
Hats off to Fiio. Great product, great concept, great delivery and they thought of everything.