System boot chime right speaker only

bootnvramspeakers

I recently replaced the internal hdd inside my macbook pro mid 2012 with a ssd. Now it seems that the system chime (the "boong" that goes off when i turn it on) only plays through the right speaker. Within the OS sound comes out of both speakers.

I have tried both a NVRAM reset and a smc reset.

What could be the issue?

Best Answer

This seems to be a problem for a particular number of MacBook Pro models starting in 2010. According to this article in the Apple support site, the following models have a sub-woofer speaker in addition to the left and right speakers to enhance mid-range sounds.

  • MacBook Pro (15-inch, Early 2011)
  • MacBook Pro (15-inch, Mid 2010)
  • MacBook Pro (15-inch, Late 2011)
  • MacBook Pro (15-inch, Mid 2012).

Looking at this article in the Apple discussion boards and this article here on Ask Different, users of these models are experiencing the same issue. If I had to guess, every model with this sub-woofer acts the same way and only a few users have noticed it.

There may not be a way to correct this. I hope this information helps.

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