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Dionyz wrote:
3 - Dynamic peaks are what drive the need for power, not average loudness. The 20 dB dynamic peak is an average. Certain sounds require well above this level, pushing 40 and up to 60 dB.
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Please provide reference to 40 and 60 dB peak material. The most dynamic music, which is extremely dynamic, is in the range of just over 30dB over average RMS levels. This is very rare. Typical modern music has about 10-13 dB peak values compared to the average RMS levels. THX certified movie standards require a peak 105 dB SPL on the main channels, and 115dB SPL on the LFE. 85dB is the reference value use for calibration, though actual movies may average 10dB lower in actual playback.
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That is why even the RF-83 speakers NEED more than 140 watts/channel for pure and unclipped dynamic peak reproduction.
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If it's really 140 watts, and able to handle the current increase required by the impedance dips of the speaker, then the amplifier will do fine with that speaker system in any circumstance, assuming it's sensitivity is rated accurately. I have not seen credible 3rd party testing of the amplifier/receiver that you mention(Onkyo 905) under the appropriate test conditions, so I don't know if it can really deliver it's rated power to that particular speaker system.
-Chris