Four Pairs of Etymotic Research ER-4Ss (IEM)

Measurement

[1. Appearance ]

One of my friends in SEEKO community lent me three pairs of ER-4Ss to measure the product variations between these.

Also he requested me to measure the difference of the normal ER-4S cable and the S type(100ohm) custom MMCX connector.

Etymotic Research ER-4S Measurement

[2. Frequency Response ]

Check my Measurement Procedures first.

{① Original Frequency Response }

Unit Numbers

• Pair 1: Unit No.305090 and No.305098

• Pair 2: Unit No.302603 and No.302601

• Pair 3: Unit No.271405 and No.271418

• Pair 4: Unit No.226220 and No.226252

All datas measured with ER38-18 (Gray 3-flange eartip) / Uncompensated.

Pair 1

Pair 2

Pair 3

Pair 4

Comparison

• Orange: Right channel of pair 1

• Black: Right channel of pair 2

data of 8 separated channels 

• 94dB @ 500Hz matched

data of 8 separated channels

• All units measured at the same output voltage 

{② After changed the filter to new one }

Unit Numbers

• Pair 1: Unit No.305090 and No.305098

• Pair 2: Unit No.302603 and No.302601

• Pair 3: Unit No.271405 and No.271418

All datas measured with ER38-18 (Gray 3-flange eartip) / Uncompensated.

Pair 1

• Changed to new filter

Pair 2

• Changed to new filter

Pair 3

• Changed to new filter

* Couldn't change the filter of pair 4, due to lack of filters

data of 6 separated channels

• All units measured at the same output voltage

data of 6 separated channels

• 94dB @ 500Hz matched

Pair 1

• Black: Before the replacement

• Orange: After changed the filter

Pair 2

• Black: Before the replacement

• Orange: After changed the filter

Pair 3

• Black: Before the replacement

• Orange: After changed the filter

[3. S type(100ohm) Custom MMCX Connector ]

S type MMCX connector made by AW Audio

Impedance of stock ER-4S cable (without unit)

• Cable 1 - 101.5 ohm

Impedance of stock ER-4S cable (without unit)

• cable 2 - 102.9 ohm

Impedance of S type MMCX connector with MMCX cable (without unit) - 100.9 ohm

• Black: Stock ER-4S cable

 • Orange: S type connector with MMCX cable

+

Full analysis of ER-4S

check here:

http://clarityfidelity.blogspot.com/2015/08/etymotic-research-er-4s-iem.html