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Original Message

As power paradigm has nothing to do with acoustic power....

Posted by 6AS7_6SN7 on October 6, 2010 at 23:46:50:

I see a serious efficiency problem and an 'out of control' ambient frequency response.

I a recent post of mine
http://www.audioasylum.com/forums/otl/messages/3/33624.html
I recalled the classical graph of (electrical) power transfer/efficiency vs. the relative amplitude of source and load impedance.

Assuming that source impedance is high (w.r.t. speaker load impedance) this means that the amplifier/speaker combination, when operating according to power paradigm, lies at the very left of the peak of the curve of electrical power transfer, close to the XY origin, where efficiency is extremely low.

If this is correct, power paradigm is basically negating the very purpose of audio power amplification.

What is even worst (in my opinion) is that the power paradigm portion of the power transfer characteristic is so steep to actually preventing any tonal balance with the vast majority of commercial speakers (that are designed for optimal performance when driven by a voltage source and whose electrical impedance varies quite a lot over the operating band).

Pushing to the limit your argument, if the source impedance were infinite we would even obtain a flat frequency response (irrespective of any variation of speaker load impedance), but with NO POWER TRANSFER at all to the speaker.

If this is the price of power paradigm I would rather stay with moderate feedback (and voltage source paradigm)!

I still do not know how to faithfully reproduce the orchestra dynamic range (more than 90 dB) without enough 'raw' power.

Best Regards
Luca