Well I had a good listen today.
I bought a pair of ATH-ES10 (equipped with ESW11 leather earpads - upgrade) last week or so and found them not be what I was expecting. Even with the Fostex.
I had been pleased with the Fostex but had a few things I want 100% about , for example:
-I found that it did sound better with my custom piccolino USB/LOD even though some people said it being just 1 and 0s that it shouldnt matter etc, but it did make it cleaner and clearer to my ears.
-Also the sound seemed to be ever, EVER so Slightly to the right, I was not convinced it wasnt just my ears, my ear canal or my hearing that was causing this and had to spend time Constantly finding the sweet spot to get an even sound. I did read of low level volume channel imbalance but I was getting it at 1 and 2 o`clock on the volume pot.
-I have never understood why with basic portable amps the volume bar disappears but on the Fostex, CLAS and upcoming Hifi-M8 the volume bar stays there, although disabled.
Today I got my serviced Fostex back and was quite surprised, to quote the email;
`We completed the repair of your HP-P1.
We replaced the volume pot with the new one.
Also we added some more soldering to eliminate a static / crackling
noise at the headphone jack.`
This seemed enough to make it sound uber good.
The few things I wasnt 100% about seemed to have cleared up too.
-It now sounds better to my ears With t
he stock Fostex USB/LOD. This is trying with my ATH-ES10 and the more mid centered ATH-ESW9.
-The sound is even on both ear cups and seems to be all through the volume pot (need to test further at low levels with some IEMs admittedly).
-The volume bar now recedes/disappears when synced with the Fostex hp_p1.
And the ATH-ES10 now sound awesome!
And the sound seems better to me, less `murk` and more clean. More impressions to come on the sound with the new firmware.
Screenshot of new Firmware (I think hardware is the same?)
Stock Apple music player (no volume bar).
Flacplayer app (also no volume bar)