After a whole day listening and doing swap AMP. Exhausting day it was, I had a a lot of learning and reminder... but lets carry on to the comparison.
DX220 Mod (DM) with Fidelizer with AMP1Mk2 Mod (A12M) compare to DX220 Stok (DS) with AMP8EX-FE (A8EF) & AMP1Mk2 Stoc (A12S)
DM+A12M vs DS+A12S
There some scenario / Parameter, I used :
1) using my Song (Flac 16/24 Bit). Mid Gain; Mango OS; Digital filter 4; Volume 7
DM +A12M will be more open especially in Vocal and Treble (spark), with better separation and more depth in soundstage. But DS+A12S will be more musical and Dynamic with my song.
2) using HiRes song like DSD, DSF etc. Mid Gain; Mango OS; Digital filter 4; Volume 7.
Here DM+A12M shine Much better, and make DS+A12S sound muddy. Here I found, changing Gain to High, can help to improve the DM+A12M dynamic. (but for me this is painfull, really loud).
3) using HiRes song like DSD, DSF etc. High Gain; Android OS (mango Player); Digital filter 4; Volume 18.
DM+A12M will have more darker background, the sound was more impressive then in MANGO OS.
But here some draw back I experienced, in current scenario, Music File must be Hi-Res like DSD and so on. if not, the sound will be not improve in high marginal.
DM+A12M vs DS+A8FE
High Gain, Android OS, Volume 17-22. digital filter 4
1) DSD song : DM+A12M will shine better with great clarity,
2) my Flac song : DS+A8FE will be Musical with great dynamic...
from here onward, I felt myself become complicated... and supposed to enjoy... so I consulted to a friend and was given advised to simplified.
My own conclusion :
DS+A12M will be my wanted preference, I like the dynamic sounding, with a bit detail...
AMP1Mk2 stock is the most balanced sounding to cater all music, IMHO (quite revealing for myself in the end)
AMP8EX-FE will be very good for song genre like Vanesa Fernandez, for me, its like a good pair why AMP8EX-FE shine in Vocal and instrument.
Based on owner also modder, the last 2-3 update, Fidel seems no much effect...
My own concern :
When you upgrade / mod your device, transparency will be your two edge sword, song file will determine the Sound quality u perceive
High Gain and Volume can help to gain Dynamic, but also quite painful if you are a low volume listener.
All demo use and pair with current gear : CFA SOLARIS & BRISE cable