Q: iMac late 2013 + Mavericks + USB Sennheiser - input freeze

Early 2011 MBP, 17" Display,

OS X 10.9.2 (13C64)

Upgraded from ML -> Mavericks after reading some positive commentary here about multi-monitor & USB support.

Blue Yeti microphone like another poster before.

Blue Yeti microphone doesn't work at all, worked under ML, I get what sounds like low audio input and a poor sampling rate (like the stutter you here on a disconnecting mobile phone call).

Very disappointing - ML worked just fine. Since I too used this for podcasts, my unrealistic choice is to go back to ML, or maybe I have to buy a Windows laptop or a used one to make my podcasts and publish - yech. - this is really disheartening to other professionals in my field too.

Anyone have an Apple contact I can write to get this fixed?

Already tried the usual things, such as a PRAM reset, no USB devices but the Blue Yeti, and I'm 100% sure it has nothing to do with my USB ports, other devices work / worked fine under ML.

I'm having the same issue with the Blue Yeti Mic. I thought it was the Mic, but when I go to my other iMac station running ML, it works just fine. I can't imagine what is taking them so long to get this one fixed. The problems sounds like it effects many USB mics or audio equipment.

I also still have the problem with Sennheiser headset. Sound starts to make scratching voice on the other end of the call after few minutes. The headset works fine with my old mid 2009 MacBook Pro running Maverics. The update did make it better than it was, but I still can't use my Imac(3TB Fusion Drive) costing 2700,- euros on my voip-calls. Frustrating.

I'm thinking of taking this Imac back to Apple store and getting my money back. I'm getting so frustrated with Apple's way of doing these things nowadays. I think we should all take our Imac computers(with Fusion Drive) back to Apple, maybe they would really do something with this problem after getting tens of thousands Imacs returned...

I'm on 10.9.2 and for me it's not linked to a microphone or headset. After my computer sleeps, my keyboard doesn't work (wired Apple keyboard). Mouse still works (both wired and wireless) but I have to reboot to be able to use the keyboard.

UPDATE: A few weeks ago I posted that I was having problems with some of my USB devices since I upgraded to Mavericks. I found out the reason, and it's embarassing: My upgrade to Mavericks happened at the same time that I purchased a new computer and desk, and it turns out that in the process of unplugging and re-conneting all my devices I plugged the wrong power cord on my USB hub. This basically fried the hub and everything connected to it. A trip to the Apple store confirmed this (for instance, their in-store keyboard worked in my USB port but my keyboard from home was dead on any computer they tried it on). Anyway, I bought a new hub and new peripherals and now all is fine! An expensive lesson but an important one.

Thanks to all of you who offered your help and advice. I really appreciate it.

Well I have a MBP late 2011 and I´m having the same issue. Pluging in a Sennheiser Heasdset with a Creative USB soundcard a few minutes later all participants of Teamspeak complain about a metallic robotic echo sound coming from me. It vanishes after 30min+

Running a SSD with Mavericks. But the problem occured also in 10.7 with a normal HDD.

Tryed a cord adaptor for splitting the 3.5mm jack but it didn´t work for me. He didn´t recognize the external microphone. Will try that Sennheiser PCV05.....

Sadly around the same time as the pages/safari updates this reverted for me.

The Audio will deterioate over the course of 2-5 minutes. Unlike before I don't have to restart the machine a hour later it might be fine, then a hour after that it might degrade again.

For a month it worked perfectly and I have no idea why it has changed again.