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Etymotic ER4 SQ

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miT View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote miT Quote  Post ReplyReply Direct Link To This Post Posted: 15 Nov 2019 at 6:50am
Comparing the specs between mine and the IEMs I demo'd with the best sounding HF, impedance matching may not be the issue:

Etymotic ER4-PT = 27 Ohms, 102dB @ 1 kHz
Shure SE846-CL = 9 Ohms, 114dB @ 1 kHz
Campfire Audio Andromeda = 12.8 Ohms, 112.8dB @ 1kHz
Sennheiser HD-540ii = 300 Ohms, 94dB @ 1kHz

Someone with a more technical understanding may be able to clarify this as all were used via my DAP but only the ER4 sound rubbish.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote patientot Quote  Post ReplyReply Direct Link To This Post Posted: 15 Nov 2019 at 3:38pm
Originally posted by miT miT wrote:

Comparing the specs between mine and the IEMs I demo'd with the best sounding HF, impedance matching may not be the issue:

Etymotic ER4-PT = 27 Ohms, 102dB @ 1 kHz
Shure SE846-CL = 9 Ohms, 114dB @ 1 kHz
Campfire Audio Andromeda = 12.8 Ohms, 112.8dB @ 1kHz
Sennheiser HD-540ii = 300 Ohms, 94dB @ 1kHz

Someone with a more technical understanding may be able to clarify this as all were used via my DAP but only the ER4 sound rubbish.

This is all a bit above my pay grade, but do you have a link to specs for your DAP? My understanding is that output impedance of the headphone jack is important. AFAIK if it is too high then it might not be the best match for some lower impedance headphones. 

I looked up measurements of the ER4PT done by Inner Fidelity. It looks like there is a significant dip in the frequency response just before 10Khz. That dip may lead to a sound you don't like. What you could try, is EQing the headphones using the EQ on your DAP or computer software. 

A quick and dirty way to do it is to look at the chart, and try to bring up the peaks where you see FR dips and the reverse for FR peaks. This is what I do for my headphones. 

A more complex/advanced way to do it is use software, e.g. Hesuvi + Equalizer APO (freeware) or Sonarworks (not free). Sonarworks does have a free beta Android app right now that you can also try. You select your model of headphones in the settings and it flattens out the FR. 

Reflex M + PSU-1 used with AT VM95ML, Stanton 680mkII + Jico Shibata, and Shure M35X cartridges.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote miT Quote  Post ReplyReply Direct Link To This Post Posted: 16 Nov 2019 at 6:29am
Originally posted by patientot patientot wrote:

This is all a bit above my pay grade, but do you have a link to specs for your DAP? My understanding is that output impedance of the headphone jack is important. AFAIK if it is too high then it might not be the best match for some lower impedance headphones. 

I looked up measurements of the ER4PT done by Inner Fidelity. It looks like there is a significant dip in the frequency response just before 10Khz. That dip may lead to a sound you don't like. What you could try, is EQing the headphones using the EQ on your DAP or computer software. 

A quick and dirty way to do it is to look at the chart, and try to bring up the peaks where you see FR dips and the reverse for FR peaks. This is what I do for my headphones. 

A more complex/advanced way to do it is use software, e.g. Hesuvi + Equalizer APO (freeware) or Sonarworks (not free). Sonarworks does have a free beta Android app right now that you can also try. You select your model of headphones in the settings and it flattens out the FR. 

Thanks, mine too.


The spec does not list the output impedance although it does show the power output. I will ask the designer and hopefully he will supply that information.

In the last few months of using my IEMs via my old source I used to EQ them and they responded well, albeit they did not suffer with this bland frequency response issue at the time, but my new DAP does not include an EQ setting. Considering how amazing it makes my other headphones sound (even my Beyerdynamics sound considerably better than through my desktop system!!), I wouldn't want to compromise that anyway in purist fashion.

Your comment about Inner Fidelity has now inspired me to create a new thread as I have questions...
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