Tinny sound: Possibly left and right speaker (of u. case) broken?

After replacing my SuperDrive and powering on the device the speaker popped loudly and don't work anymore.

I apparently just get a (bad) sound from rear speaker (Product code: IF160-031-1).

I did several checks: rear speaker cable seems to be ok, also did PRAM reset and also some software system configuration checks in Lion (Sound, Audio MIDI).

SystemProfiler does NOT show any failure and internal speakers are recognized by system.

No red light is on (optical mode of audio jack).

My simple guess: I've blown my little right and left speakers which seem to be included in upper case?!

Questions:

1: How could this happen? What did I wrong, even though I followed instructions carefully!

2: Are there possibilities to fix my old speakers somehow?

3: Can I replace only these little right and left speakers without case?

4: Better let Apple do this for me as I already failed with medium task?

Ответ на этот вопрос У меня та же проблема

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