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Koss SB/49 headphone's mic not seen by MacBook Pro 17" 2.4 GHz 10.5.2
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Mac Enthusiast
Join Date: Sep 2000
Location: San Francisco
Status:
Offline
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I'm setting up a new work computer today, and the CEO strolled by and tossed me a pair of Koss SB/49 headphones with built-in boom microphone. So I plug one into audio out, the other into, well, you know.
Audio out works as expected for headphones. Audio in, however, doesn't seem to "see" me plugging or unplugging; System Preferences always shows a line "Line In - Audio line-In port". The input level is always nothing. I've played with the input level slider; no joy.
The audio in plug looks as though it's a stereo plug (even though there's only a single boom mic). Does the MBP expect a mono plug? Is this the problem?
Help, as always, gratefully accepted.
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Mac Enthusiast
Join Date: Sep 2000
Location: San Francisco
Status:
Offline
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Okay, okay, it seems that the headphone's audio out plug needs to go into a USB dongle.
That isn't intuitively obvious. Grrrrrr.
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Fresh-Faced Recruit
Join Date: Nov 2007
Status:
Offline
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The mic in plug is not mic in but audio in, i.e. it needs amplified current not provided by a microphone.
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Posting Junkie
Join Date: Oct 2005
Location: Oouston, TX
Status:
Offline
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As you correctly noted in your first post, it's a "line in" port not a "mic in" port. It needs a line level signal, not the signal from a microphone.
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Mac update estimates: MacBook Pro 2Q09 or 3Q09; MacBook 2Q09 or 3Q09; MacBook Air 2Q09 or 3Q09; Mac Pro/Xserve 1Q09 (2.93-3.33+Ghz Nehalem, 48+GB RAM); iMac 1Q09 (Cantiga, 2.53-3.06Ghz Penryn [quad possible], 8GB RAM); Mac mini 4Q08 (2.1-2.4Ghz Penryn, 4GB RAM).
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