The Basilar Membrane and Crossover Distortion

[speaker dave]

Originally Posted by weltersys

If the goal of a speaker designer is to make a speaker that reproduces recorded music accurately, the last thing one would want to do is put a 12 dB response dip at the ear's most sensitive frequency.

It will be interesting to see how Ian defends his assertion that flat frequency response is not optimal.

Maybe only 6 if the phase is just right

There was a BBC reference that showed that a continuous treble rolloff was preferable to flat response with a hole at the crossover. A large dip at crossover magnifies the impression of a divide betweeen the elements.

Absolutely true that we are used to the resonance peak in our normal hearing and must not try to EQ it out with our speakers (its also different frequencies for different people; big ears, small ears).

And, did we ever hear how this was related to the Basilar membrane?


David S.

[lolo]

that's not true Charles, our hearing was not originally built for reverberant spaces, we can only adapt to them. Why our ears are shaped and spread as they are is mainly a cause of hunting/hunted situations that you and I, obviously never met! It's a survival thing .

have a look:

http://www.2pi-online.de/diffuse_attenuation_color.png

I believe it also depends on the polar of the source, omni, dipole, horn.. CD or not, so there isn't a clear, unique answer.
That's where this concept I believe fails. A gap, ok, why not. But for any speaker, really? Independant of the radiation pattern?
Mr Knight seems to have dissapeared!

[speakerdoctor]

Originally Posted by lolo

........
Mr Knight seems to have dissapeared!

I think he got much more than he bargained for.

I suspect he was 'testing the waters' to see what reaction he'd get to his marketing approach and design philosophy. He's done this at 3 defferent speaker DIY forums!

[weltersys]

Originally Posted by speaker dave

Maybe only 6 if the phase is just right

There was a BBC reference that showed that a continuous treble rolloff was preferable to flat response with a hole at the crossover. A large dip at crossover magnifies the impression of a divide betweeen the elements.

Absolutely true that we are used to the resonance peak in our normal hearing and must not try to EQ it out with our speakers (its also different frequencies for different people; big ears, small ears).

And, did we ever hear how this was related to the Basilar membrane?

David S.

David,

I fished the patent out of my trash so others won't have to bother down loading Ian Knight's masterwork.

"With the Basilar Membrane not having to deal with the two-tone noise generation...."

It is a good laugh, don't drink anything while you read it .

Art

[Scottmoose]

It does sound a little like an English public school.

"Well Jenkins, what are you doing here?"

"I've just popped in for a quick beating sir."

[speakerdoctor]

Originally Posted by Scottmoose

It does sound a little like an English public school.

"Well Jenkins, what are you doing here?"

"I've just popped in for a quick beating sir."

[speaker dave]

Originally Posted by weltersys

David,

I fished the patent out of my trash so others won't have to bother down loading Ian Knight's masterwork.

"With the Basilar Membrane not having to deal with the two-tone noise generation...."

It is a good laugh, don't drink anything while you read it .

Art

Thanks for that Art. Pure BS to think that crossover impacts beating. As long as the frequencies are preserved (of course they would be) gain is equal for both tones (brought into question with his design) then the beating rate and depth can not change. Even phase shift will only shift the "phase" of the generated beat.

Still no connection to the Basilar membrane that I can see. A good example of technical obfuscation, it sounds plausible and tech-ish.

David S.

[speakerdoctor]

Originally Posted by speaker dave

.... A good example of technical obfuscation, it sounds plausible and tech-ish.

David S.

Evidently just enough Dave to get a patent and launch a marketing campaign.

[Scottmoose]

It's got plenty of company on that score, alas. I mean, I've no problem with people having a huge hole in the midrange response of their speakers; fair enough if that's what they like. But now I've gone through the two patents etc., I was struggling not to laugh out loud.

[speakerdoctor]

Have you visited Mr. Knight's web site to get access to his 'phase beating' tutorials? :-)

His site is called "Knight Loudspeakers". However, I couldn't find any evidence of his product line. Could anybody?