What filter is there to hold? Why don't the other tips use it? The filter is right in the middle of the bore, so it will cause sonic differences. The link showns this filter tip has better treble response than all the other stock tips, which may be partly due to the filter. 

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inks said:

What filter is there to hold? Why don't the other tips use it? The filter is right in the middle of the bore, so it will cause sonic differences. The link showns this filter tip has better treble response than all the other stock tips, which may be partly due to the filter. 

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But there is no filter in the tip...  Just a bar.  The bar is used to hold a third party filter in place if you wish to.  That was the original design of the tip (Heir Audio uses a hybrid version of that tip; that's my source). 
 
Now, if you really believe it's that bar that's causing better treble response, please back up your statements with proof.  Cut the bar, remeasure (do actual science with an independent and dependent variable).  Tell me how much the treble attenuates because the bar is missing.  Until then, your statements really have no backup or merit.

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tinyman392 said:

 
But there is no filter in the tip...  Just a bar.  The bar is used to hold a third party filter in place if you wish to.  That was the original design of the tip (Heir Audio uses a hybrid version of that tip; that's my source). 
 
Now, if you really believe it's that bar that's causing better treble response, please back up your statements with proof.  Cut the bar, remeasure (do actual science with an independent and dependent variable).  Tell me how much the treble attenuates because the bar is missing.  Until then, your statements really have no backup or merit.

Click to expand...

Well, I meant the bar when I said filter. That may be Heirs intent but Hifiman never mentioned that, they probably just noticed it sounds better with this filtered tip and that's it. Anything that is placed in the bore is going to have an effect, basic acoustics, I will not bother, so take it as you will.

tinyman392 said:

But there is no filter in the tip...  Just a bar.  The bar is used to hold a third party filter in place if you wish to.  That was the original design of the tip (Heir Audio uses a hybrid version of that tip; that's my source). 

Now, if you really believe it's that bar that's causing better treble response, please back up your statements with proof.  Cut the bar, remeasure (do actual science with an independent and dependent variable).  Tell me how much the treble attenuates because the bar is missing.  Until then, your statements really have no backup or merit.

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To be fair, I don't see why your statements have any more merit than his... two sides of the same coin.

While its not apples to apples, it may be easier for you to add a bar to a tip you already own then test it if you are curious, as opposed to tips being destroyed. No tips need to be harmed.

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inks said:

Well, I meant the bar when I said filter. That may be Heirs intent but Hifiman never mentioned that, they probably just noticed it sounds better with this filtered tip and that's it. Anything that is placed in the bore is going to have an effect, basic acoustics, I will not bother, so take it as you will.

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I will take as I will.  The tip has a bar, the auditory effect of it is unknown.  We'll leave it at that... Heir Audio says the bar is used to hold a filter between the nozzle and the tip.  I know you feel different because you don't trust manufacturers in the first place. 
 
Your statement that it boosts something still bothers me though.  Basic acoustics, heck physics 101 teaches this too, teaches that placing something in front of sound will attenuate it. 
 
I'm assuming that the resonant frequency won't make a difference because, well after calculating it, the resonant frequency of a rubber string (this is basically what the bar is) is fn = nv/2L where v is the velocity of sound and L is the length, and is an integer in [1,inf].  The length is no more than 5mm or .005m
 
This gives us:
fn = (331/(2*.005)) * n
fn = 331/.01 * n
fn = 33100 Hz
 
So the resonant frequency is 33.1 kHz.  Not audible, don't even try to claim you can hear it.  The longer the string, the lower the resonant frequency...  So if it's smaller, it puts that number up. 
 
Now, basic test using a bar on my speaker with a calibrated microphone, the bar is about 12-13cm and has a resonant around 1.3 kHz.  Notice that in general, the frequency will only go down.  There is no major boost anywhere...  There is a cut in the frequency response though at 5kHz and the resonant frequency plays little roll.
 

 
 
Your turn to show some sort of data that says that there is better extension due to a bar. 

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tinyman392 said:

 
I will take as I will.  The tip has a bar, the auditory effect of it is unknown.  We'll leave it at that... 

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Dr. Fang.   Calling Dr. Fang.......

lwien said:

Dr. Fang.   Calling Dr. Fang.......

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Aha. Brilliant. I'll ask him tomorrow!

People. Get a good fit. Play this in 480p. Be prepared to have your jaws drop. Deep bass is nowhere near the top of my priority, and it is not the reason why I love the RE-400, yet these IEMs do sub-bass so incredibly well. Please compare with your other IEM(s) that you feel has the best sub-bass.
 

Correct me if I'm wrong, but doesn't the comparison simply show the differene between using the single and double flanges, as opposed to the specific parameters (e.g. the bar) determining those results? Also, shame they didn't include those singles in a larger size.

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quartertone said:

Correct me if I'm wrong, but doesn't the comparison simply show the differene between using the single and double flanges, as opposed to the specific parameters (e.g. the bar) determining those results? Also, shame they didn't include those singles in a larger size.

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Yeah.   It's really the only thing I didn't like about the RE-400's and that's the tip selection.    They are either really small or really big.   Nothing in between, and I'm kinda in between.   

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tigon_ridge said:

People. Get a good fit. Play this in 480p. Be prepared to have your jaws drop. Deep bass is nowhere near the top of my priority, and it is not the reason why I love the RE-400, yet these IEMs do sub-bass so incredibly well. Please compare with your other IEM(s) that you feel has the best sub-bass.
 

Click to expand...

 
I'll do that when I get my ASG-2s in a couple of weeks. Hopefully by mid-July.

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quartertone said:

Correct me if I'm wrong, but doesn't the comparison simply show the differene between using the single and double flanges, as opposed to the specific parameters (e.g. the bar) determining those results? Also, shame they didn't include those singles in a larger size.

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Yup, that's exactly what it is...  Hit the nail on the head...  I do wish they would include larger sizes of the single-flange filter tips... 
 
EDIT: nail on the head, not head on the nail XD
 
 
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vwinter said:

Aha. Brilliant. I'll ask him tomorrow!

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Please do.  If it does, I'm curious to exactly why the bar does that. 

As long as the length of the tip is the same, no need to graph the larger sizes, don't know if there is a length differences. Yes it shows the differences between a single flange [filtered] to double flanges, it isn't meant to show anything else as those are the only stock tips. It's still not unproven the bar itself doesn't haven an effect. 

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kyuuketsuki said:

 
I'll do that when I get my ASG-2s in a couple of weeks. Hopefully by mid-July.

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Holding you to your words, buddy.

Here is the thing.... If, by some crazy idea, the bar did attenuate sound (which I don't believe it does), and it did do it for the better... Why didn't they put a bar in to a set of the double flanges or put them in all of them? Would seem like a crazy oversight.
 
And I've seen a few companies use the bar, non of the sound ever changed with similar tips without a bar. I've tried with Sennheiser and Audio Technica ear buds. (Keep in mind, I don't have golden ears so if the difference is slight and it did, I couldn't hear it)