Piezo...
1. With regard to the peak/rms (voltage) ratio, this would be 1.414 for a pure sine wave. High frequency waveforms are more jagged than low frequency, and the "spikes" will go much higher relative to the rms. Suggestion...look at some waveforms with a scope if you have one.
2. In general, I suggest that you measure what your high and low amps are delivering in your real world situation. If you are using high frequency horn drivers with very high sensitivities your HF amp may indeed be loafing.
1. With regard to the peak/rms (voltage) ratio, this would be 1.414 for a pure sine wave. High frequency waveforms are more jagged than low frequency, and the "spikes" will go much higher relative to the rms. Suggestion...look at some waveforms with a scope if you have one.
2. In general, I suggest that you measure what your high and low amps are delivering in your real world situation. If you are using high frequency horn drivers with very high sensitivities your HF amp may indeed be loafing.