I couldn’t find any info on the driver size of the ER2 series so I contacted Etymotic and got an official number from them.
The official response I got from them is that the driver size of the ER2 series is 5.8mm.
Author: Sandeep Shetty
Koss KPH30i – Unboxing
Unboxing the Koss KPH30i. Feel free to leave a comment if you have any questions.
Sony MDR-CD900ST – Unboxing
Unboxing the Sony MDR-CD900ST. Feel free to leave a comment if you have any questions.
KBEAR KB04 Measurement (Frequency Response Graph)
Measurements taken using v0.1 of my DIY IEM measurement rig
JVC HA-FD7 Measurement (Frequency Response Graph)
Measurements taken using v0.1 of my DIY IEM measurement rig