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post #121 of 128
Look for the graph of such type for Custom Art Musice Two (I can't remember where exactly it was posted but as far as I remember this was either on Custom Art fanpage or was posted by tomscy2000 somewhere on headfi). The main impact of high impedance was on highs.
Ohh and I would forgot it piotrus-g posted in Custom Art appreciation thread the effect of high impedance on his pro330 (the effect was slightly different from Music Two).
post #122 of 128

I looked at Tyll's graphs of BA iems.  They seem to have significant distortion.  How come to my ears they sound tight and clear, and joker rates them so high? Does the fit have lot to do with it?  My CIEM sound very clear and tight.

post #123 of 128
Thread Starter 
Quote:
Originally Posted by SilverEars View Post  I looked at Tyll's graphs of BA iems.  They seem to have significant distortion.  How come to my ears they sound tight and clear, and joker rates them so high? Does the fit have lot to do with it?  My CIEM sound very clear and tight.

 

BAs' time domain characteristics behave a bit differently from those of dynamic coils, so they sound crunchier. In general, with the exception of certain types such as Sony's proprietary BAs, balanced armatures exhibit higher levels of odd order distortion than do dynamic moving coils. Odd-order distortion is said to be "less pleasant" than even-order distortion. While multiple BA earphones squash down the distortion, distortion is fairly audible in many single driver models and some dual driver models. The rule of thumb is 1% THD at 100 dB is audible, but I find that I can hear 0.8% (when measured at 100 dB, but not necessarily listened to at that loudness) with no problem if it's in the most sensitive band of human hearing (~500 to 5000 Hz) --- I've heard a lot of BA earphones, though, and have honed myself to recognize the kind of distortion they exhibit. So you'll need to train yourself to recognize the distortion, though with enough training it shouldn't be a problem; it's not like I have golden ears, I just have more experience. Even so, I don't think it's a huge deal. It doesn't sound that bad, but some people may insist on a cleaner distortion profile. In that case, they'd want to go with a high-quality coil driver such as the liquid-crystal polymer diaphragm used in the Sony EX1000, or the Titanium-coated Mylar diaphragms used in HiFiMAN IEMs. Regular ol' Mylar works too, but the QC has to be done well, or else the distortion profile is no better than that of a BA.

post #124 of 128
Tom, how does this distortion sound? Is it like noise floor or something different?
post #125 of 128
Thread Starter 
Quote:
Originally Posted by shakur1996 View Post  Tom, how does this distortion sound? Is it like noise floor or something different?

 

Something different. Hard to explain. Have you taken the Philips Golden Ear Challenge before? You can hear subtle (and not so subtle) examples of simulated distortion there.

 


 

NOTE to all: Please PM me before requesting to be a contributor for the chart, or else I won't know who you are just by looking at your e-mail address.

post #126 of 128
Quote:
Originally Posted by SilverEars View Post
 

The hump in the high end is getting close to perceived neutral(Sean Olive), correct?  But, yeah, it extends.  I've seen the Sony XBA-H3 which extend good at the high end also.  But, these are dynamic.  Are there others besides ER4 that extend like the dynamics?

 

By the way, how are you extending the treble like this?

It's actually way brighter than Dr. Sean Olive's curve, I didn't design this with that curve in mind anyway. There's nothing much to it really, just a simple horn and that's it.

 

Pretty much any driver from the 2300 family and the twfk/wbfk can extend beyond 15khz. Whether they can reach 20khz without severely rolling off is another thing. 

post #127 of 128

I've noticed that even with the treble rolloff, BA sound more clear to my ears.  I wonder why that is.  Also, would BA be affected same as dynamic drivers when it comes to resonance?  BA has resonance at the crossovers from my understanding, and dynamic has little to none.


Edited by SilverEars - 5/30/14 at 6:04am
post #128 of 128

Wondering if there is quality difference between the BA drivers?  I notice that some BA iems sound better than others. For example, UERM obviously sound better than TF10 or UE900.  Even with CIEMs, I notice that my NT6 sound better than my other one.  

 

Are higher quality BA drivers used form flagship models?

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