Well, I think I found the issue . I've been using foam eartips with UM2. 4R came with silicone eartips. The silicone material is obviously denser, and I guess it transmits movement from the body more effectively to the IEMs. I tried using the silicone tips with UM2, and got basically the same...

Quote:   The UM2 has the original braided cable without the memory wire, looks and acts pretty much the same as the 4R cable. I removed the memory wire/plastic from the 4R cable to see if it would help. DIdn't make any real difference unfortunately. Thanks.

Quote:   Hi, thanks for the reply. However, I have a good seal with both IEMs. Of course the UM2 isn't totally immune to microphonics, but I can be active, walk etc., while using the UM2 and not being bothered by it. Being active while using the 4R is downright uncomfortable, esp...

Hi!   Nice forum, this is my first post here. Anyways, I've used Westone UM2 for several years, and finally decided to get some better IEMs. I bought Westone 4R, which was a good improvement in sound quality. However, I have a big problem with 4R. The earpieces (not the cable) seem to be...