fist thank you for your time !Another thing. I don't understand why people has so bad opinions on V2. As far as I know only output impedance is worse (around 10ohms). So if you really have low impedance headphones it may not be for you. On the other hand if you plan to buy some more expensive headphones M500 makes sense. Buying $400 dac/Amp just for one $200 headphones is an overkill imo.
As I can agree that M500 is clearly better device than DX3 Pro, I cannot agree with some other claims. Don't not why M500 sounded better for you. It has similar power, maybe little less than DX3 pro with 150ohm load. Output impedance of 10ohm is to low to make a difference with HD58x. Maybe it's just placebo maybe your DX3 was broken - who knows. Low output impedance is much more important with portable devices in my opinion...
About Amir's recommendation - DX7s got recommendation (10ohm OI), DX7pro got recommendation (expensive, 6.2ohm OI). DX3 Pro V2 as affordable dac/Amp combo (around $160 on Drop) would probably get it also...
Amir has any IEMs who would have guessed? ;-)
Good thing is you like you M500, that's most important and that what counts.
I even had 2 different units of DX3 Pro and the P50 LPS.I have the Dx3 pro and the M500, and I can't hear any difference between them...fwiw.
DX3 has 10 OHM output impedance, so of course it can affect IEMs. It's not the DAC you are hearing... it's the output circuit.I even had 2 different units of DX3 Pro and the P50 LPS.
On my IEMs: DX3 Pro had no bass, M500 totally fine.
On my 58x: DX3 Pro had bass, but didnt extend as low as M500. Voice was presented in front of music. M500 presented voice more as part of the music with fuller bass.
There was clearly and audible difference.