[XipeTotec]

  Don't know first hand but according to this, the S2 does not do OTG.  Look through the list on the page for compatible phones.  The Desire 816 is not listed but I'm running that without any problems.  There are several no-contract phones under $100 that will do OTG.

 
You are right but I've seen this. If he can do it... https://www.youtube.com/watch?v=skgEKS4uzWA

 

[XipeTotec]

My new iBasso just arrived and I'm trying it out. For the moment I can just say: wow.

 

[Hinomotocho]

Apologies if this has been asked before - just received my unit this week and was wondering it requires a burn in period?

 

[king conan]

For me no difference after 5 charge cycles (about 50 hours).

 

[XipeTotec]

One more question: is it normal to hear hiss while not playing music with IEMs?

 

[Mad Max]

Depends on the IEMs' sensitivity.

 

[XipeTotec]

  Depends on the IEMs' sensitivity.

then i suppose sennheiser CX300ii are not suitable for the iBasso d-zero. playing quality is good, but when music stops, i hear a clear hiss.

 

[CalvinXC]

Had this amp for well over a week, I'm impressed with how this little beast performs at this little price.
 
Some SE846 user said it is dead silent, but I have different experience over here, I have a pair of SE535LTD, which doesn't play well with many amps/DAP, partially to blame is the sensitivity, (119dB vs 114dB on SE846). *basically hiss with anything, iPhone to entry level DAP, except DX90 and some AK or higher end DAP.
 
When plugged in, a clear background noise appears, similar to my Cayin C5, but to a lesser degree, when the music plays, how good it sounds kinda made me forgot that hiss. I don't blame the amp at all, at this price, I'm smiling as I'm listening to all that good songs and typing this. Performed pretty well with my RE400.
 
So far pros > cons, which I'm happy with. Probably will get a pair of close back headphone soon. 

 

 

[acain]

I am going to purchase this someday I really like how compact it is. How does it push hard to drive headphones I have Beyerdynamic DT770 80ohms that are hard to drive to a good listening level?

 

[ZSamuels28]

I am going to purchase this someday I really like how compact it is. How does it push hard to drive headphones I have Beyerdynamic DT770 80ohms that are hard to drive to a good listening level?

These should be no problem to drive, the MKII specs say it can drive 8-300 ohm and 80 ohm isn't tough to drive at all. I have 250 ohm Beyers and use my C5D (another portable DAC/Amp) to drive them and it handles them no problem and could actually drive higher than that. So I don't think you should have any difficulty in driving the 80 ohms with this.

 

[acain]

Like others have stated the 80 ohm Beyerdynamic dt770 I find hard to drive for some reason.

 

[joshnor713]

then i suppose sennheiser CX300ii are not suitable for the iBasso d-zero. playing quality is good, but when music stops, i hear a clear hiss.

You sure you have it set to the low gain setting?

 

[Mad Max]

Like others have stated the 80 ohm Beyerdynamic dt770 I find hard to drive for some reason.

 
An amp with an output buffer like this Zero is generally the right choice for DT770-80.  I'm just assuming that there's an exception out there that I'm not aware of.  But I'm sure this amp will do.

 

[acain]

Thanks i think i will buy it cant go wrong for how cheap is.

 

[ZSamuels28]

If you want something a step up you could go with the JDS C5D which is an amazing portable amp/dac and can easily drive the 80ohms and much higher than that.