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Thanks for the link - disturbing lack of accuracy there

Posted by Duke (D) on March 25, 2007 at 17:13:50

In Reply to: Re: My answer would be the same. posted by Borough33 on March 25, 2007 at 15:17:30:

Musical Fidelity left out something very critical in their calculations: The additive reverberant sound contribution.

It's very easy to establish that this is real. Measure your speaker at one meter, then again back at 4 meters. Anechoic theory predicts a 12 dB falloff in SPL (assuming point source speakers). If you measure less than 12 dB falloff, the difference is reverberant field contribution. Typically you will get a 3-4 dB higher reading than anechoic theory would predict. Musical Fidelity's numbers would lead you to buy twice as much amplifier power as you need.

Musical Fidelity does mention the reverberant field but instead of telling the truth about its contribution they say that a small amplifier somehow generates a fuller-sounding reverberant field than a large amplifier. This is a pure BS. The reverberant field is an acoustic phenomenon, and has absoutely nothing to do with amplifier power or distortion characteristics. I can only conclude that they are trying to convince you that if you heard a small amplifier fill a large room, it was actually a distortion-induced trick.

Now note that the engineering department probably has zero influence on what the marketing department prints, so the fact that Musical Fidelity is making BS statements does not necessarily reflect the quality of their amplifiers - only the credibilty of their propaganda.

Duke

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