I received my HF5 a few days ago, and I'm quite happy with them. The included foam tips provide incredible isolation, bad microphonics, and moderate comfort. The tri-flange provide less isolation, less microphonics, and more comfort. I'm getting the "glider" tips in a few days and will see how...

It seems the impedance on the HF5 is a bit too low for my Sansa e280 portable player. The volume is fairly loud even on the lowest setting. Has anyone tried using the HF5 with the ER4P/ER4S adapter? I assume the added impedance would lower the volume at a given player setting.

I think I may know why the er6i is reported to have slightly lower isolation level than the er4/hf5. According to these posts, the er6i has a small port in the body of the earphone. I suspect this port transmits a small amount of external noise into the ear.

Thanks for all the responses. Based on the feedback in this thread and others, I've decided to go with one of the Etymotic models. I'm between the 6i and hf5. The 6i are cheaper, but the hf5 supposedly has better sound quality, better build quality, and slightly better isolation. I'm...

I'm looking for some IEMs with maximum isolation. I have very sensitive hearing and work in a noisy office. For me, sound quality is a distant second behind maximum isolation. Price range is $200 and under. Based on my research, it looks like the Etymotic er4 and hf5 provide the most...