January 2021 – SoundChaser.org

Interview with Demond, the CEO and Product Manager at ddHiFi, about the companies first IEM, E2020A (Janus)

Editor’s Notes

To truly understand a product I feel it’s important to know the context in which the product was built and what the creators were aiming for, or intended. This is my attempt to learn more about the creator’s perspective and also share it with a wider audience. Hope you like it.

Please bear in mind that the text below is translated by a translator and some nuances might be lost in the translation. If you have any followup questions please feel free to comment on this post and I’ll try to get them answered.

final A4000 Measurements (Frequency Response Graphs) and Comparisons with Etymotic ER2XR

I had posted measurements (frequency response graphs) earlier for final A4000 based on my old rig. Here are the latest measurements based on v1.0 of my IEM Measurement Rig.

final A4000 Left and Right Channel Frequency Responses

3 samples each of the left and right channel. For each sample I remove and re-insert the IEM.

Etymotic ER2R Measurements (Frequency Response Graphs)

These are the first measurements from v1.0 of my IEM Measurement Rig.

Etymotic ER2XR Left and Right Channel Frequency Responses

3 samples each of the left and right channel. For each sample I remove and re-insert the IEM.

IEM Measurement Rig v1.0

After struggling quite a bit with the DIY tube-coupler and in the interest of making my graphs compatible with other graphs out there for easy comparison, I decided to get an IEC6038-4/IEC60711/IEC711 coupler. This is a Chinese knockoff which is supposed to be pretty close to the real deal.

Setup

Hardware: Laptop > USB Audio Interface > Sound Card (Mic In) > IEM > IEC711 coupler > Sound Card (Front Out) > USB Audio Interface > Laptop.
Software: Room EQ Wizard (REW)