[Feelthebeat]

  It is better to not use while charging. 
 
It is better to charge before first usage.
 
It is better to use a safe power supply.
 
 
 

 
Thanks for the feedback, I'm considering using this with the original cable for charging, seems optimal? If the text in the pic is too small, it says "5.25 V, 2.1A" output .
 

 

[Dobrescu George]

I think that it was limited to 5V, and 5.25 could burn the charging circuit. 
 
You should power from laptop or computer USB port, if not sure. 

 

[Feelthebeat]

  I think that it was limited to 5V, and 5.25 could burn the charging circuit. 
 
You should power from laptop or computer USB port, if not sure. 

Yeah, I am using my computer at this time. I have another adapter for my mobile that is 5.0V and 1500mA, maybe should use that one instead.

 

[Dobrescu George]

  Yeah, I am using my computer at this time. I have another adapter for my mobile that is 5.0V and 1500mA, maybe should use that one instead.

To play safe, yes. I am using a 1000ma and 5.0V phone charger, and it works good.

 

[alert426]

Wow it has good spec.. Also design looks good!

 

[rhythm is life]

Does anyone have any idea how the crossfeed circuit changes the frequency response? I like having the option to use with Spotify or any other time I'm not using Neutron Music Player with its built-in crossfeed, but the E12's crossfeed seriously kills the high frequencies. I was thinking about getting a Fiio X5ii and balancing out the crossfeed FR with the equalizer, but right now I think Neutron on my old iTouch is the way to go, even if its DAC is not the highest quality. I just don't understand why these "audiophile" music players lack the sound adjustability that consumer-oriented players have.

 

[x RELIC x]

Crossfeed overlaps the signal slightly from the right and left channels. Good for older tracks that have hard panning to one side, like many songs from The Beatles for example. It usually sounds very odd to hear an instrument or a voice on just one side so the crossfeed helps with this. If you don't need it for this application then leave it off as crossfeed will flatten the imaging on most regular stereo music that has better channel balance.

 

[rhythm is life]

I'm familiar with the basic concepts of crossfeed, personally I leave it on all the time as it doesn't mess with the FR too much with the moderate settings I use (650 hz lowpass, -6 to -7 db crossfeed level depending on the headphones I use). These settings are for Neutron and foobar2000, which share a similar crossfeed implementation, if not the same. With the E12, the crossfeed seems more extreme, like the lowpass is set at a higher frequency and the crossfeed level is set closer to 0 db. It's really a shame, as a more subtle (adjustable if possible) crossfeed on the E12 and parametric EQ on the X3/X5 would be enough to make the E12/X series an endgame portable rig for me.

 

[The Walrus]

I noticed that there is balance mismatch with the volume knob of my E12 . Left channel volume is slightly higher than right below 50%. 
When I use low gain, I need to go as high as 100% volume sometimes. I do just fine with low gain, which solves my problem, but in some cases I need high gain. (My headphone is a bit hard to drive)
Any advises? 

 

[HotIce]

I have two E12 and none has the imbalance issue. That being said, especially with small form factor pots, imbalance can be pretty bad, even on ALPS (assuming they are original ).
Nothing you can do, besides playing with gain to keep the pot in the balanced area.
Not sure if you can claim warranty for that.

 

[JamesBr]

Wow it has good spec.. Also design looks good!

+1

 

[bombjoke]

Another power question- does it use less power if the input is silent? That is, if I pause my clipzip, it has auto off but e12 doesn't. Will it drop to consume only minimally, or pretty much give regular life (12hrs? ) even if it's amplifying silence?

Also, if I recharge after only 50% depletion, Will i negatively affect the capacity?

 

[HotIce]

Your main "no sound" consumption is come from the idle current from the op-amps and buffer.
It's about 5.5mA for the LME49710 plus 7.5mA for the LME49600, per channel. Plus, other circuitry leakages (the voltage boost charge pump, the relay on the HP output, etc...).
So yes, it does not go in sleep mode with no input signal.

 

[CountryBoy]

Another power question- does it use less power if the input is silent? That is, if I pause my clipzip, it has auto off but e12 doesn't. Will it drop to consume only minimally, or pretty much give regular life (12hrs? ) even if it's amplifying silence?

Also, if I recharge after only 50% depletion, Will i negatively affect the capacity?

In my experience, even with input silent the E12 will still only last regular life(or a little bit longer). Recharging after 50% depletion has no negative effect on the FiiO battery(IMHO).

 

[JamesBr]

   
Thanks for the feedback, I'm considering using this with the original cable for charging, seems optimal? If the text in the pic is too small, it says "5.25 V, 2.1A" output .
 

+1