I recently purchased a second hand pair sr80i's. I've been using them for about two weeks and have noticed on some songs, particularly with lower frequencies, there is a bit of distortion. It was only a few songs though, other songs that go down to the same frequencies don't have this problem. It's also not too common among most of the music I've been listening to, however its stopped me from enjoying the music that it does happen in.
I used Adobe Audition to view the spectral for some of these songs and they all meet the flac quality that they claim to be, so they haven't been transcoded from a different format or more specifically, a lower bitrate.
I then thought that this was simply because of my lowly Realtek onboard audio, and i planned on getting a usb dac/amp anyway.
Then i was reading about Grado Grattle and i read about the tone tests another user did. First i did this one here http://www.audiocheck.net/audiotests_frequencychecklow.php
The tone in fact presented a rattle of sorts that lasted until around 60 hertz, then it went away. I played the same test again, no rattle. I played it a few times after that and nothing.
What do you know? It rattled for about half of the test. I did it again and it was completely clear.
Then i went back to the low frequency test and i got the rattle again, this time however it stayed for the entire test. I played this multiple times after that and once or twice it rattled before clearing up. Going back to the high frequency one again the rattle was back. Testing back and forth there is always rattle in the opposite frequency once the sr80i "adjusts" to the one i just ran a few times. Usually it lasts for one test, maybe two. and sometimes doesn't last the whole test; so it seems to be slightly random. It also seems that if i play one test and then wait a few minutes and play it again the rattle returns, as if my waiting let it unadjust or something. However i can play both at the same time and after a few seconds they will both be clear.
The seller said the headphones came with just a few small scratches, and he said "nothing that changes the audio". I do find it odd now that he would add specifically that mentioning the audio. Now the bad part, I haven't checked yet how long i have until i can no longer return these however, I've already had them for a bit over two weeks... and during the time i thought it was just needing a proper dac, i may have vented the drivers just a bit, meaning i likely cant return these anyway.
I don't really know what it is even now, i only know what I've experienced so far and I've pretty much typed it all out. I'm hoping one of you Pro-Audiophiles will come along and tell me this is something with a quick 'n easy fix. "get the hair out of your drivers"
Edited by notthedoctor - 6/6/14 at 8:02pm