xplod1236 said:
Peak-to-peak voltages are usually measured with storage oscilloscopes, where you observe the upper and lower peak envelopes of the signal. If you're measuring with a DMM in AC V scale, it's rms. However, many voltmeters will produce accurate and meaningful results in AC Vrms scales only when the signal waveform is a sine wave.
If by "peak voltage" you really mean peak-to-peak (which has a very specific definition), then that explains it. The 45Vp-p you measured would actually about 15.9Vrms, so the rms power delivered to your 2.7 ohm speaker is about 94W. This, and the fact that it's music rather than sine wave is why the transistors and diodes are holding up fine.
-Ti
Because your calculations are flawed as the previous poster pointed out. Your multimeter is not the correct instrument to make the measurements with, and the audio source is not right, Your measurements should be made with an oscilloscope and your amplifier should be driven with a sine wave.
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