Brand New DT990 Rattle?

[kevindang577]

Newly purchased DT990s. I did a sine wave test on this website https://www.szynalski.com/tone-generator/ and between 15-25hz (max volume) the right driver rattles like crazy. Below 10hz the left driver also starts rattling. Is this normal behaviour? My AKG S8 earphones run this test fine..

 

Ran test on ALC1220 Onboard (Level 3 power)

[Juular]

How often do you listen to 15Hz pure sine wave ? That's normal, it's resonant frequency of the driver it seems.

[kevindang577]

4 minutes ago, Juular said:

How often do you listen to 15Hz pure sine wave ? That's normal, it's resonant frequency of the driver it seems.

but is it also normal that one side rattles before the other?

[Juular]

3 minutes ago, kevindang577 said:

but is it also normal that one side rattles before the other?

Manufacturing isn't perfect.

[dalekphalm]

9 hours ago, kevindang577 said:

Newly purchased DT990s. I did a sine wave test on this website https://www.szynalski.com/tone-generator/ and between 15-25hz (max volume) the right driver rattles like crazy. Below 10hz the left driver also starts rattling. Is this normal behaviour? My AKG S8 earphones run this test fine..

 

Ran test on ALC1220 Onboard (Level 3 power)

Have you ever heard the rattle outside of a pure sine wave test pattern? Eg: during normal music, sounds, talking, gaming, movies, etc. If no, then it's no problem.

 

If it rattles during normal usage, RMA them immediately.