Hey vapman, didn't you take the TO12 off your recommended basshead list? Just curious why?
After I took it off my list I think sellers realized they were causing too much confusion by calling it TK13 when it was actually called TO12. I did not want to divert business to those who had chosen to title it the TK13 over those who called it the TO12.
When I bought my set I was told by the seller there was a tuneable bass port and open back design. I put them in my ears and was happy with the bass off the bat but the more I listened the less impressed I was. Eventually tore the grilles off the back to find out they were glued on to make it look like they were open when they weren't. I noticed they sounded too stuffy and tried to see how open the vents were... well there were none.
I can not prove this but I do not believe it has 2 BA's either. If it does, it really does not sound like it. I think it is a single DD and single BA. I could be wrong.
Edit: The reason I said this isn't "just because" - I found the exact shell this IEM uses on aliexpress as a DIY shell, I will link it up when I find it again, but it had a lot less hollow space than you would assume, and I am
assuming because the shells look the same from the outside, that they are. I have also owned many 2 BA + 1DD and 1BA + 1DD IEMs and can tell the difference fairly easily. so if TO12 has 2 BA's, i'm going to say they are not as well tuned to each other than they could be.
It's the opposite effect of the KZ ZS3. The ZS3 i put in and was like "well this is okay but not amazing" and after a few hours of listening I am truly impressed. With the TO12 I was really impressed at first and then after a few hours of listening found it couldn't keep impressing me, and then the shape of it started to hurt my ears.
I'll rec the ZS3 over the TO12 any day.