Yup - still BS. - Duke - Speaker Asylum

Yup - still BS.

Posted by Duke (D) on March 25, 2007 at 20:09:58

In Reply to: Re: Thanks for the link - disturbing lack of accuracy there posted by Borough33 on March 25, 2007 at 17:25:33:

Most of what Musical Fidelity says is true or at least arguable. But they slip in a couple of things that simply are not true and claim an umbrella big-name endorsement for the whole thing. That's not honest.

If you have a Radio Shack SPL meter, or can borrow one, you can easily disprove their claim of 6 dB falloff for each doubling of distance in a semi-reverberant environment. I have made such measurements. In my room I measured at one meter and back at 8 meters - three doublings of distance, or 18 dB of falloff according to Musical Fidelity. I measured 11 dB of falloff. That's 7 dB less than Musical Fidelity claims, because they are claiming what anechoic theory predicts and ignoring the reverberant field's contribution. If you go back far enough in a large enough room (like an auditorium), the sound pressure level becomes constant because the reverberant sound totally dominates. This is basic acoustics, known I'm sure by the people whose endorsement Musical Fidelity claims.

On their claim that a lower powered amp makes the reverberant field "sound fuller" allegedly due to clipping, let's take a look. Clipping shows up as static-like bursts of high frequency energy, reproduced by the tweeter which would be beaming at those high frequencies so clipping would be relatively more audible in the first-arrival sound than in the reverberant sound. And an increase in high frequency energy would not normally be described as "sound[ing] fuller".

I think Musical Fidelity's marketing department is engaging in deliberate deception in order to promote interest in their big amplifiers.

Duke

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Follow Ups Full Thread

Topic - Loudspeaker sensitivity question. - Borough33 21:45:44 03/24/07 (14)

well there acouple issues here, lsitening distnce being one, most of us listen at least 2 to 3 metres away or more! - Timbo in Oz 21:10:11 03/26/07 (0)

Peak output is usually a brief transient. Many amps can provide double their rated power for brief peaks - Richard BassNut Greene 10:39:17 03/25/07 (0)

Re: Loudspeaker sensitivity question. "rephrased" - Borough33 09:14:12 03/25/07 (9)

My answer would be the same. - Duke 14:25:37 03/25/07 (8)

Re: My answer would be the same. - Borough33 15:17:30 03/25/07 (7)

Thanks for the link - disturbing lack of accuracy there - Duke 17:13:50 03/25/07 (6)

Re: Thanks for the link - disturbing lack of accuracy there - Borough33 17:25:33 03/25/07 (5)

How to play games with figures, names, and quotes. - David Aiken 01:39:49 03/26/07 (0)

Yup - still BS. - Duke 20:09:58 03/25/07 (0)

I'd sue! :^) - Paul Joppa 19:55:16 03/25/07 (1)

I don't do this sort of thing very often... - Duke 10:29:27 03/26/07 (0)

Damned lies - Russ57 19:10:43 03/25/07 (0)

Re: Loudspeaker sensitivity question. - RGA 07:25:37 03/25/07 (1)

Re: Loudspeaker sensitivity question. - Duke 02:53:44 03/25/07 (0)

Follow Ups

Yup - still BS. - Duke 20:09:58 03/25/07 (0)

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