throttle position sensor, wicked vacuum leak, or could be your lead foot mashing the gas pedal to the floor
also what you might be referring to could be a load on the engine, (such as an uphill slope) which would cause an automatic transmission to "downshift" gears to find a more powerful rpm.
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nox is from exhaust temps too high or a cat. convertor breakdown.
http://www.hearingcenter.com/Questions/Q_high_pitch.html
most amplifiers have overvoltage shut off protection. verify the voltage coming into the amplifer it should be less than 14.9 volts even at high rpm
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