[hakuzen]

Hi, are you willing to share some measurements of er4s from these 3 different couplers? Thank you.

hi. sorry, i don't own er4s now, so can't do it. but you have measurements from @crinacle of some er4 in this thread. guess few variations would get obtained using different rigs.

 

[JohnYang1997]

hi. sorry, i don't own er4s now, so can't do it. but you have measurements from @crinacle of some er4 in this thread. guess few variations would get obtained using different rigs.

Just curious about how different couplers perform in the higher range 10k+ with deep insertion. That actually defines an excellent 60318-4 or a mediocre one. What about other earphones but at reference plane? Thanks !

 

[hakuzen]

Just curious about how different couplers perform in the higher range 10k+ with deep insertion. That actually defines an excellent 60318-4 or a mediocre one. What about other earphones but at reference plane? Thanks !

then i'll try with er6i when my new setup is ready (new computer, it will take a bit long, sorry). if you find higher reference iems in my inventory, please let me know and i'll also try them.

 

[Raketen]

then i'll try with er6i when my new setup is ready (new computer, it will take a bit long, sorry). if you find higher reference iems in my inventory, please let me know and i'll also try them.

whoa... that just brought back some memories!

 

[hakuzen]

whoa... that just brought back some memories!

sure.. my first decent iems and lot of memories with them too, got some pairs in 2007.. only one pair has survived (cables got broken in the other pairs)

 

[JohnYang1997]

then i'll try with er6i when my new setup is ready (new computer, it will take a bit long, sorry). if you find higher reference iems in my inventory, please let me know and i'll also try them.

er6i should be doable probably adding resistor in series and with different depth. This is really exciting. And don't be sorry, I really appreciate it. I am also doing some experimental modification on the chinese coupler to achieve better high frequency 10k+ to matche ra0045 and bk 4157. If you are interested I will post some comparison soon.

 

[hakuzen]

er6i should be doable probably adding resistor in series and with different depth. This is really exciting. And don't be sorry, I really appreciate it. I am also doing some experimental modification on the chinese coupler to achieve better high frequency 10k+ to matche ra0045 and bk 4157. If you are interested I will post some comparison soon.

yep, i'm very interested!
at +10kHz, together with coupler, tips and insertion depth, mic specs and calibration (and source) will be relevant. which mic are you using?
about the resistor in series, i guess it shouldn't be needed while using a very low impedance source; but maybe i'm missing something due to my ignorance.

 

[JohnYang1997]

yep, i'm very interested!
at +10kHz, together with coupler, tips and insertion depth, mic specs and calibration (and source) will be relevant. which mic are you using?
about the resistor in series, i guess it shouldn't be needed while using a very low impedance source; but maybe i'm missing something due to my ignorance.

The resistor is used to improve the high frequency of er6i. Because you know it's 6i instead of 6, it's high frequency above 10k isn't that good. As almost every single ba driver has higher impedance at higher frequency (inductance of coil), adding resistor to cancel out the higher sensitivity of lower frequencies. Which in another word will improve the high frequency reproduction like er4p -> er4s.
The simulator I am using is probably the one that headflux has, which has a mediocre to good coupler and cheap electret mic.
I am experimenting of add leakage to the coupler. I was just curious! And it surprisingly improved the resonance at 13k for my er4/hf5, being much closer to the fr etymotic provided which was measured with gras ra0045. And the mod not just work on deep insertion, it also works for my sony mh755 comparing to speakerphone's measurement. Oh and of course there is drawback, the low frequency will be leaked out around -20db at 20hz.

 

[JohnYang1997]

The modification greatly improved the resonance at around 13k.

Spoiler: ER4XR

Spoiler: THE SIMPLE MODIFICATION

The small gap is what you need to experience in real time like the one in arta. btw make sure dont hurt your self

 

[JohnYang1997]

Also for relatively shallow insertion

Spoiler: Sony mh755

From Speakerphone

Just for simpler comparison

Detailed and named overlays

 

[JohnYang1997]

Source is a sound card, at this point, I think sound card basically plays no roll in this.
Coupler is a Chinese 711.
Mic is the one come with the coupler which is the cheap mic you mentioned before. It is a electret type and needs a 9v polarizing voltage.
No calibration used in the signal chain.

 

[JohnYang1997]

And if I take the two measurements and erase the inaccurate part, I will have a fairly accurate frequency response curve, which is not to please other people but truly useful.

Spoiler: My heavily modded Klipsch X11

Compensated with Etymotic target curve

Raw

 

[bartzky]

@JohnYang1997: That's some interesting stuff you did there! Generally I'm pretty happy with my 711 but the Etymotics do bother me a bit too. Have you thought about replacing the mic with a better one?

 

[hakuzen]

yea, mic specs are important when going >10kHz. better accuracy for every kHz above is expensive, though.
my brother (audio engineer) calibrated some cheap panasonic electret mics and he was surprised of their performance. he didn't find significant differences compared to his calibrated behringer ecm-8000.. till 10-12kHz.

through your mods, you might have found the relevance of those "pressure equalizing holes" of the coupler.

Edit:
you can find some recent measurements of ER4S using different rigs (chinese coupler and iMM6 included) here, by @castleofargh :
https://www.head-fi.org/threads/hea...different-results.751100/page-2#post-13933374

 

[JohnYang1997]

I don't think that the inaccuracy is necessarily caused by the mic but the coupler but I know the mic must be doing something fishy here. Even tho I am not quite sure. Here I measured some earphones on air without coupler. You be the judge.

Spoiler: NOOO coupler on AIRRRRRR

There is significant noise after 50khz just ignore that.