I recently bought Sennheiser Momentum 2.0 bluetooth headphones and I use them mainly with my imac. After a bit of fiddling I figured out to force aptx via the bluetooth explorer and disable the handsfree profile as well, as countless people are recommending.
At this point I'm pretty happy except for one minor annoyance: I can't connect the headphones without OS X insisting on dropping the sound quality as if it were receiving a call and then deciding it is not a call after all and switching back to normal quality. I'm not sure if this is specific to OSX or the momentum 2.0, or both.
Symptoms: I turn the headphones on. Almost immediately it announces "connected", as it should. If any music is playing at this point it first plays at good quality but almost immediately it changes to very low quality. After a few seconds the head phone announces "call ended". From then on everything is fine.
I've been searching for a resolution to this but I haven't been able to find anything that even confirms this is a known issue. So, is there a way to skip the whole connected … call ended ritual? I'm not actually interested in answering any calls with this thing.
Best Answer
It turned out the problem was Skype. I have this running all the time and when you turn on your bt headphones it tries out the microphone as if it was in a call before ending the call. The problem goes away if you don't have Skype running. Alternatively, you can connect your headphones with skype open and then switch to its sound settings end switch things back to internal speakers & microphone. It seems to persist these settings even when you disconnect/reconnect the headphones after that.