Posted January 11, 2020 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) Link to comment Share on other sites More sharing options... Link to post Share on other sites More sharing options...
Posted January 11, 2020 How often do you listen to 15Hz pure sine wave ? That's normal, it's resonant frequency of the driver it seems. Tag or quote me so i see your reply Link to comment Share on other sites More sharing options... Link to post Share on other sites More sharing options...
Posted January 11, 2020 Author 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? Link to comment Share on other sites More sharing options... Link to post Share on other sites More sharing options...
Posted January 11, 2020 3 minutes ago, kevindang577 said: but is it also normal that one side rattles before the other? Manufacturing isn't perfect. Tag or quote me so i see your reply Link to comment Share on other sites More sharing options... Link to post Share on other sites More sharing options...
Posted January 11, 2020 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. For Sale: Meraki Bundle iPhone Xr 128 GB Product Red - HP Spectre x360 13" (i5 - 8 GB RAM - 256 GB SSD) - HP ZBook 15v G5 15" (i7-8850H - 16 GB RAM - 512 GB SSD - NVIDIA Quadro P600) Link to comment Share on other sites More sharing options... Link to post Share on other sites More sharing options...
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