PP-SALB2-EVM: PP-SALB2-EVM Learning Board & TAS5828M EVM Board Question

Tool/software:

Hi TI support Team,

  Now, I have two Symmetrical speaker ,that I learning  has met some issues,

1. Because the type of speakers is dobule diaphragm, does it can be learned following single diaphragm way ? 

  if can't, is there any suggestions for this question.

2. The two symmetrical speakers (R/L) , they are the same characterization 4 ohm / 4W, but the outer packaging is not all the same,

  can I learning one side PPC3 file, then synchronize the another speaker ? 

3. When I play sounds on TAS5828M EVM board at the begin, is normal.

   But when I play a period of time after, the sound sounds R/L side became unbalance, is there any suggestions for this question ?  

   Does it thermal protection not at the same point cause this issue, or other factors affect.