I went with ultimate mod on amp8 which is not even listed on fidelizer. He said it is a money no objection mod. Meaning that it gets all best parts in amp he can get his hand on. Though what he mentioned it comes with diminishing returns and for steep price increase, hence he took it off the list.I know and I can't believe it can get better than this as stock. I only had it for a month before it stopped working late Feb and it was sitting around packed up for ages to return. I only got it back last week but wow. I honestly forgot how good it is. This is without the Rah as well.
Next few days I'll get 8 & 9 but also PB1 & Halcyon that's a lot to try out.
I didn't find out how the fidelizer upgrade went with yours. Would you recommend doing it?
I wanted best available so i went with ultimate anyway.
People who own both EX and Ultimate said they are quite similar. So it says something.
It improved resolution across FR and layering quite a bit. I am personally happy with it.
I would suggest to digest both amps at stock first for at least 100 hrs. And decide which one to send for mod. If you do want to go for a mod.
There is also equivalent main body mod that you can get too but you would loose warranty on the unit...