Audio echo in Lync meetings

I have an iMac 27" purchased brand new from Apple in early 2014. It’s a fine machine, but there’s an audio problem that’s killing my collaboration with coworkers. I’m hoping somebody here can help me resolve this. AppleCare couldn’t.
Most of the folks in my company are PC guys. We all use Microsoft Office365, specifically Lync. I have Lync for Mac 2011 installed on my iMac via Office365. I can see other users, I can join meetings, I can start meetings, I can share audio and video. All of that seems to work fine.
What’s killing me is that all of my colleagues report a terrible echo in a Lync meeting when they're speaking and I'm not muted. This happens when joining a meeting via the Lync Web App (after clicking Join Lync Meeting in an Outlook message). Maybe the Web App is a factor, don’t know. But I believe it also happens with the Lync desktop app.
My voice comes through loud and clear, no issues. But when they speak while I’m not muted, they hear themselves on about a one second delay. To prevent this, I have to mute myself in Lync and generally not speak during collaboration sessions. That’s, shall we say, less than ideal.
Here's what I've tried:
    •    Rejoining the meeting
    •    Turning down my Input volume in System Preferences
    •    Uninstalling the Boom app, which I thought might be messing with my audio
    •    Turning downy the audio volume within the Lync Web App
    •    Futzing around with the Lync preferences
    •    Changing my default browser from Safari to Firefox so the Lync Web App uses the latter browser
My Sound preferences look like this:
Nothing has worked. Audio on my MBP 15” Retina, purchased at the same time as my iMac, comes through fine, even with my Input volume cranked up to the highest level. My MBP System Preferences let me set “Use ambient noise reduction” for audio, which probably helps. That option is missing on the iMac, probably because the iMac mic has built-in noise reduction, or so I’m told. Ticking that option felt like my last hope, and it’s not even available on my iMac. Lowering my Input volume helped a bit, but then folks have real trouble hearing me, and the echo is still there. It's maddening.
Any ideas about what might be causing this annoying audio issue? More importantly, any idea how to fix it?
If this indicates that my iMac is defective in some way, I want to get that taken care of post haste. I appreciate any help you folks can offer. It would be good to be able to talk in meetings again.
Thanks.

Did you find a solution to this problem? have exactly the same issue!

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