How would you narrow the choice down to one block

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Assume that the public address system represented by the block diagram in Figure 7-34 has quit working. You find there is no signal output from the power amplifier or the preamplifier, but you have verified that the microphone is working. Which two blocks are the most likely to be the problem? How would you narrow the choice down to one block?

Reference no: EM131389780

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