Just wanted to say that the Yuin PK3 earbuds have crazy synergy with the M8.  With these earphones the M8 pulls ahead of my iPod classic. I prefer the PK3s over the Vsonic GR07s with the M8.

rickb said:

Just wanted to say that the Yuin PK3 earbuds have crazy synergy with the M8.  With these earphones the M8 pulls ahead of my iPod classic. I prefer the PK3s over the Vsonic GR07s with the M8.

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Im curious about pk1 with m8 ??!

francopro said:

Im curious about pk1 with m8 ??!

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That might be a bit much without an amp.

Hello again.
I got my HTC One M8 and I did measure the output impedance of it.
 
The output impedance of HTC ONE M8 Sim Free UK version is 1.02 ohm.
 
Just to make sure, I also did measure my O2 amplifier and the result I got was about the same as the ones that can be found on the internet (and creator's website). I did that just to confirm that my method of measuring it is accurate.
 
I hope someone will find it useful.

protofik said:

Hello again.
I got my HTC One M8 and I did measure the output impedance of it.
 
The output impedance of HTC ONE M8 Sim Free UK version is 1.02 ohm.
 
Just to make sure, I also did measure my O2 amplifier and the result I got was about the same as the ones that can be found on the internet (and creator's website). I did that just to confirm that my method of measuring it is accurate.
 
I hope someone will find it useful.

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Thanks for the input mate.

That's a very valuable info for europeans like me. Hard to fathom that in Taiwan they are selling a 9ohms version.


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protofik said:

  Hello again.
I got my HTC One M8 and I did measure the output impedance of it.
 
The output impedance of HTC ONE M8 Sim Free UK version is 1.02 ohm.
 
Just to make sure, I also did measure my O2 amplifier and the result I got was about the same as the ones that can be found on the internet (and creator's website). I did that just to confirm that my method of measuring it is accurate.
 
I hope someone will find it useful.

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I'm curious, how do you measure the output impedance? Do you have a link handy?

Is 1.02 a good number?

For all but the most low impedance IEMs, this is a good number. If you have higher impedance headphones, you don't need to worry much about low impedance sources. 

protofik said:

I've contacted HTC through their live chat. The guy spent almost half an hour trying to find it's output impedance but he couldn't. He only told me he found on the internet that it's about 9ohms but it's not an official spec.
If I will get this phone, I will measure it myself and post here.

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roscoeiii said:

For all but the most low impedance IEMs, this is a good number. If you have higher impedance headphones, you don't need to worry much about low impedance sources. 

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Nice one.

A too high output impedance is not really making any problems with low headphone impedances.
The problem is, when you have IEMs with multiple BA-Drivers.
Like, different bass drivers, mid drivers and treble drivers.
Those different drivers get influenced by the output impedance differently, so the overall tonality is changed (like lower bass, higher treble).
I have tried Shure SE 215 on a 100 Ohm Asus Xonar DX (but Frontpanel), and it didnt sounded strange
 
A low output impedance like 0-1 Ohm is pretty much not influencing any drivers, and delivers pretty much very neutral, unchanged sound.

darkseth said:

  A too high output impedance is not really making any problems with low headphone impedances.
The problem is, when you have IEMs with multiple BA-Drivers.
Like, different bass drivers, mid drivers and treble drivers.
Those different drivers get influenced by the output impedance differently, so the overall tonality is changed (like lower bass, higher treble).
I have tried Shure SE 215 on a 100 Ohm Asus Xonar DX (but Frontpanel), and it didnt sounded strange
 
A low output impedance like 0-1 Ohm is pretty much not influencing any drivers, and delivers pretty much very neutral, unchanged sound.

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I disagree. Actually, I find the output impedance being one of the most important factors affecting the sound. I didn't like the sound of SE215 (20 ohm iems) on my previous Galaxy S3 (output impedance 3.5ohm) phone and I don't even want to image pairing them with 100ohm source.
 
 

hungryhoss said:

Is 1.02 a good number?

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The rule is that the output impedance of the amp should be 8 times lower than headphones' that you are pairing with it.
1.02ohm means that any 8ohm or higher iems will pair nicely with the phone (at least in theory).
Short answer: Anything below 2ohm is very good.
 
But you know... it's just my opinion after all...

protofik said:

  I disagree. Actually, I find the output impedance being one of the most important factors affecting the sound. I didn't like the sound of SE215 (20 ohm iems) on my previous Galaxy S3 (output impedance 3.5ohm) phone and I don't even want to image pairing them with 100ohm source.

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I didnt said, i used them on 100 ohm DX (maybe the frontpanel was lower). I just tested it.
 
If you didnt liked the SE 215 on your 3,45 Ohm Galaxy S3, then you just dont like how the SE 215 sounds.
0.1 Ohm will not sound any differently. Just as 3,45 Ohm will not even close change the sounding by any hearable amount (even if it does, it will not be more than just a tiny nuance)
The Impedance curve over the WHOLE frequency is perfectly flat. So output impedance shouldnt affect the sounding too much. Especialy if its such a tiny amount of 3.5 ohm vs. 0.1 ohm...
And i tested it myself. What changes the sound like 10 times more is, how far you push the IEMs into your ear. Especialy on the SE 215, when i pushed them further in, the bass was by FAR stronger. And in both cases
 
And even with sensible 3-4 BA Driver IEMs on 6-10 Ohm, the changes in frequency response are mostly just 1-2 dB differences...
 
And about impedance curves... The one on my beyerdynamic T90 is funny. At 100 Hz, the impedance goes up to ABOVE 600 Ohm --> So this one should react to a higher output impedance with a different tonality (because different frequences have different impedances, so reacting differentl.
And for that, i have an small Impedance adapter, that lets me change the output impedance between 0 and 470 (°) Ohm.
Even if i use 470 Ohm there, my T90 just sounds a tad warmer. Its neither a "different sounding", nor any big change in the Headphones tonality.
 
The differences there are by FAR lower, than alot people claim. Especially, if its a difference of 0.1 and 3 Ohm.

Hello
Have anyone tried the Harman Kardon version, or installed the drivers on the original m8. The users on XDA seems to like it. It uses it's own algorithm to decode the compressed audio files. I Guess it will not be usefull, if you use Neutron music player. Since it also has it's own decodin algorithm. 

Hi all,
Will they be able to drive ultrasone HFI 580?

With ease