Acoustic Transparency of Spandex - The Truth
What an appropriate and prophetic title indeed.
I don't think enough has been said about how effective my expostulated results turned out.
As I recall I was pretty steadfast in my reasoned assumptions that the Milliskin would be/was a considerable improvement over the Moleskin on both visual and aural front, having seen the Milliskin's difference visually at a full 135" (w/Panny8000), after having also 'tested' a 4' x 4' piece of the Moleskin against a RS-MM screen just prior.
That story, mostly untold ...involved my making a decision for someone whose screen I was going to be wholly responsible for. Yes...prior to that, all I had to refer to as any validation of the use of spandex was from what I had read over the last 6 years.....including some recent satisfied users who acknowledged both it's strengths and limitations.
Soon after, a few who had tried it as an alternative screen material on my suggestion, and who were less that happy with the "visual" results, took decided issue with my offering Silver Moleskin up without having tried / testing it myself. Again, I was offering up advice based on what I had seen shared by other Members....but it seemed an affront for "me" to do so.
With both things happening virtually simultaneously, and especially with my "switch", my second "opinion" based on personal observation and supported supposition was either effectively ignored or discounted out of hand. Tellingly, some seemed determined to discount Spandex altogether and start hyping a Mfg AT Screen material on this DIY Forum. Their assumption was that it had to be better....and more.
Some say I'm not supportive of "science", that I discount or even avoid such. Well not many know exactly what / who I am or portend to be / know. But that matters not to those I give advice to....and despite a few miscues, I'm hoping most feel I've helped far more than I hindered.
Then there was Tux
. Someone who has taken both a thorough and courteous approach to proving / disproving both the substance and quality of Spandex.
Looking at the graph of both the Single / Dual Layer Spandex & the Reference Speaker.....both the Frequency Response and Impulse Response curves of all three follow a virtually identical slope pattern over the entire range up to 2K with the Single layer maintaining a less than 3 db drop between 5-7k, the Dual layer perhaps at most 4db within the same 5-7k range.
And yipes (...or as you stated "BAM!"
...) the curves of the Single /Dual layers are scary identical, and actually become almost identical between 10-13k. Really, how many Dual layer examples of anything remotely considered as being a Mfg AT Screen cloth could even hope for such a result? It would NOT happen........period. Supposition on my part? Absolutely, but fueled once again by obvious postulate.
And for the icing....we have your Graph examples of the performance of the Mfg AT material, whose own performance can be at best described as being "Ho-Hum" in comparison.
And if one adds material cost into the equation and it becomes unacceptable....that is if one is truly concerned about sonic accuracy. And money.
So there it is. We now see the discussion turn to "Toe In" results. As if the performance shown on the charts is suddenly going to worsen.
C'mon now.....subjective and fair testing of the visual aspect is the really big goal remaining. Sensible Testing. It's obvious that when AT results are important, that a dual layer of Milliskin isn't going to disappoint anyone. Just the same, visually, a dual layer is the only real decision to be made. Silver over White....or White over Silver, both combos require a second layer to restrict light loss.
Coming up soon are at least two member examples of the use of Thrifty White hardboard covered with Silver and White Milliskin, separately. And in the works...BOC with Silver & White. These projects are of course not the topic of this thread. But no one can or should ignore the tie in between the visual and aural....obviously.
Yet you can bet that some do.
Sadly we cannot expect to see extensive A/V testing done on every potential Spandex combination. But your tests Tux
have shown that there is no valid reason to discount or exclude Spandex as being not just a viable alternative to a Mfg AT Cloth solution, but the preferred one in most every case where the end user is contemplating a DIY project.
We have the affordable High Lumen - High Contrast PJs......
We have an excellent and supremely affordable DIY AT solution....
Whose going to venture to state the latter is not a testimonial to the potential of sup-positional and empirical DIY reasoning?
Those things have taken DIY further over the years than any Graphs....and honestly, applications based on such have fared better with the vast majority of DIY'ers.
What I find promising in your effort Tux
is that it makes it extremely hard for even a Mfg Screen advocate to deny that DIY Screen solutions always bear a close....and open minded look. I'm sure some will still stir up controversy, if for no other reason than my involvement.
But I really do hope this will usher in a new understanding and acceptance of the basis behind trying to maintain the true nature of DIY Screen making....and the rewards it can offer to those who are faithful.