Real Expert or Just Self Proclaimed

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#121
smokinghot said:
I couldn't care less what you're user name represents. Mine is an ongoing joke amongst friends, and the pic is film character who gets high on sugar and makes my daughter laugh... Who cares.

I'm only curious about your credentials, if any, because you claim to know quite a lot, and I'm certain you can't be an authority on everything. For all any of us know, you could be one of those enlightened genuises that doesn't have any letters after their name, but can set up a septic system one day and redefine the laws of physics the next. Or some random guy that just loves audio, especially TL theory.

So, without any hostile intent.... Mr.Villastrangiato, may I ask in what field your expertise/knowlegde lays...?
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Why are credentials so important? I have always followed Richard Feynman's adage: "never believe something just because it is based of authority, tradition or religion".
If somebody can back up his ideas with verifiable facts or arguments, I'll buy them. If somebody wants me to believe he is right because he has this diploma, I still would want to hear the arguments and facts.

jd
 
#122
catapult said:
In the spirit of "real expert or just self proclaimed" perhaps villastrangiato would like to back up his claims with some measurements of real speakers -- SPL, impedance, etc. I'm not terribly concerned with academic credentials, the ability to speak tech babble, etc. Some of the smartest people I know in audio are self-taught. To quote the old commercial, "where's the beef?"
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Indeed, these are the right questions to ask, NOT 'show me your diploma'. My 2cts worth.

jd
 
#123
villastrangiato said:
... To be able to make the claim of full optimization, you have to start simple - clearly define what is "optimal" with the most basic changes to configuration - then proceed to the more detailed or nuanced. For me, this means - establish pipe length - not based on driver area or throat area or whether you've chosen an offset or a coupling chamber design or continuous tapered pipe. Just a simple undamped straight pipe. Alter the length until you get maximum total backwave output and maximum suppression of the driver's impedance curve. From there, play with throat area, taper, offsets - all the other various parameters to your heart's content. I don't necessarily buy into a specific design methodology - whether you want to label it classical or otherwise. My methodology is and always has been focused on knowing the contribution of every aspect to the end game. And as far as I'm concerned, you can't proceed to a pipe length with just throat and terminus area alone. The driver's Fs is the point of reference - not because I'm saying it is - but because the extensive test data (as obtained by Augspurger) says it is.

...
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I am quite interested. Have you already something designed using this method? Or are you in the process of designing something using this approach?
 
#125
Seems to me that the original issue here was not about which experts are "right" or "wrong", but simply that Dr Natkaniec's contribution deserves to be recognized.

Fair enough - he made a contribution by publishing that paper.

Different folks will, of course, have different opinions regarding the importance of that contribution, but if we can all agree to differ on that minor point it would allow us to get back to the fascinating discussion of race-tuned exhaust systems.
 
#126
villastrangiato said:
I didn't see any reference to driver Fs in table 1.


I think I may be approaching this problem from a different angle - I believe before other aspects of a transmission line can be considered - the pipe length should be established based on the driver's frequency dependent impedance profile alone. Augspurger's experimentation sought to establish very basic foundation principles with a simple undamped pipe. To be able to make the claim of full optimization, you have to start simple - clearly define what is "optimal" with the most basic changes to configuration - then proceed to the more detailed or nuanced. For me, this means - establish pipe length - not based on driver area or throat area or whether you've chosen an offset or a coupling chamber design or continuous tapered pipe. Just a simple undamped straight pipe. Alter the length until you get maximum total backwave output and maximum suppression of the driver's impedance curve. From there, play with throat area, taper, offsets - all the other various parameters to your heart's content. I don't necessarily buy into a specific design methodology - whether you want to label it classical or otherwise. My methodology is and always has been focused on knowing the contribution of every aspect to the end game. And as far as I'm concerned, you can't proceed to a pipe length with just throat and terminus area alone. The driver's Fs is the point of reference - not because I'm saying it is - but because the extensive test data (as obtained by Augspurger) says it is.

This is where you and I fundamentally disagree Martin. I don't like making any assumptions whatsoever. If I'm going to model something, I have to know that if I vary parameter x - it's going to produce a change in result y every time. If I'm starting out of the starting gate with a bunch of assumptions off the bat, I can't really conclude with certainty that my model is ultimately worth a darn or that I'm leaving anything substantial out that could send me in a better, more optimal direction.
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If you read the article you will see how the driver fs is used in establishing the TL length. Table 1 provides length as a function of frequency, if your drivers fs is 40 Hz then you pick a length consistent with 40 Hz and the line geometry. Not sure what you are confused about. I believe the approach in the article is exactly what you seem to describe with matching the TL's acoustic impedance to the driver's electrical impedance, see Figures 6 and 7.

All of my models or methods produce repeatable and predictable results, no assumptions or interpretation required. Again it appears that you have not read or understood what is presented.

Might I suggest you pick a driver and then lay out in detail your approach to designing a TL based on that driver and predict what the results will be, real numbers and graphs not descriptive words or opinions. Maybe try the Focal driver I used to perform the sample calculations in the alignment tables so we can make a direct comparison of the designs. Or pick a different driver, it does not matter. Until you do something like that, I cannot take your posts very seriously.
 
#127
raypalmer said:
But what are villastrangiato's professional/academic accreditations? One must ask... I'm only an accredited Carpenter and farter so I'm no snob to be sure. But surely the time has come to ask?

Are you a P. Eng? Or Ph. D?
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Credentials are meaningless. A person who understands and solves a problem may or maynot have the appropriate credentials. Granted a higher education level helps and might improve the chances of getting a good answer to a problem, but I have met many PHD's who are totally useless. I have no academic credentials in acoustics or speaker design, does that mean I cannot design a speaker? Obviously some might think so.
 
#128
MJK said:
a higher education level helps and might improve the chances of getting a good answer
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Like I said I'm only a carpenter, which means I have to deal with bad engineers a lot🙂 I was just asking to see if villa had any legs to stand on.

btw villa does my hardhat in some way offend you? Obviously no intelligent human being has ever donned protective headwear.

Also why does nationality figure into this debate? Are Canadians notoriously academically authoritarian?
 
#131
Whew! several things, in reverse order:

Ray,
which means I have to deal with bad engineers a lot🙂
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I wear a skull bucket every day...we are all about providing solutions...FIXING things that look good on paper or in someone's brain, but don't work in the real world...

More to the point:

Posted by Geddes: I've been thinking, and I'm not sure about this. In fact, I might be swayed to believe that a TL deisgn in a real room just might be a good thing (contrary to my previous point of view, which did not see any advantages). Rooms at LFs are resonant with sparce modes, generally widely spaced. If a TL were done...
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Earl,

This is (will be) progress. TL's suffer from a lack of understanding or have been poorly implemented. Their bass response profile can be tailored to be flat or drooping at any dB/Oct down to the knee. The comprehensive approach available for integrating the elements of the speaker enclosure will soon be expanded to include that sub-system's (the enclosure and driver) integration into the room. It is a logical extension of King's work.

Interesting times ahead.
 
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#132
Netlist said:
From what I've seen so far you keep mistaking the man for the ball.
Almost every participant in this thread has politely pointed this out to you.

:cop:
Here's a last official warning:
This pub has friendly open minded people, eager to learn from whoever presents his view in a mature way. You better cope with that.
:cop:

All: lets talk TL. 🙂
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I'm sorry. I didn't realize I was offending or "playing" anybody. Since I did this without consciously realizing it, I think I should refrain from participating any further in this thread to avoid offending anyone any further. Once again, if anyone who has participated in this thread feels offended, please accept my sincere apology.
 
#133
planet10 said:
Fairly compact 1/2 wave TL (ie closed0

An externally hosted image should be here but it was not working when we last tested it.


dave
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Yes that is really nice to see! Got any in curves for that beautiful beast?

Have had really good luck with lossy cabinet designs instead of TLs.

Also saw a TL that was pretty simple with about 1000 or so strings hanging down in the TL duct which was horizontal. No curves for that one either but it looked cool and sounded pretty good.
 
#134
villastrangiato said:
I'm sorry. I didn't realize I was offending or "playing" anybody. Since I did this without consciously realizing it, I think I should refrain from participating any further in this thread to avoid offending anyone any further. Once again, if anyone who has participated in this thread feels offended, please accept my sincere apology.
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It would seem to me that you are now at the point in the discussion where you have people's attention and can prove your point/knowledge about TL design. No more talking around the subject, deliver something that shows the value of your approach based on the paper you brought to the discussion. I have remained silent throughout your baiting waiting to see where you were going.

Walking away from the discussion, that you started, would cast serious doubt on your ability to actually deliver the goods. Please don't claim you are a victim of people on the forum, that is the standard fall back and excuse I see over and over again from people in these types of discussions, you have brought most of the responses on yourself with the abrasive tone of your posts and claims of expertise in the field.

To paraphrase your opening subject line.

Are you a TL expert or just another pretender?

In the eyes of other posters, only you can determine the answer to this question. No more diversions or off topic tangent posts. Your credibility is entirely within your own control. Rise to the occasion or run and hide, your choice.
 
#135
You gotta be kidding!!!

villastrangiato said:
I'm sorry. I didn't realize I was offending or "playing" anybody. Since I did this without consciously realizing it, I think I should refrain from participating any further in this thread to avoid offending anyone any further. Once again, if anyone who has participated in this thread feels offended, please accept my sincere apology.
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*******, there's no way you could have not realized how offensive you were just as you have been on another forum I frequent. I did post a rather impolite response to/about you in this thread, but deleted it shortly after. You talk a very good game, so as Martin said, design a TL that demonstrates the points you've been making and give us all of its pertinent details. Maybe the rest of us will benefit from what you'd offer.
Paul
 
#137
I think that to conform to the Utopian ideal of this forum a new device needs to be constructed that will automatically polish off any of the abrasive tone and add a healthily layer of pleasantness to all incoming posts.

I'm working on my plastic smile right now...
 
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