SDA effect at an airshow?
sda2mike
Posts: 3,131
that's right, you read it! i was at the sun n fun airshow in lakeland, fl saturday. alot of jets. loud, fast jets. then it happened. i see a jet hauling **** across the sky. everything looks normal. then, the jets sound showed up up about a mile after the jet! wow! my ears were looking for the giant polks in the sky! the sound of the machines is phenomenal. the loudest most violent sound. as these jets whizzed by, the sound followed and seemed to 'swirl' around. amazing show. if you haven't been to an airshow, i urge you to go now! just for the sounds! :cool:
Post edited by sda2mike on
Comments
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Pretty sure that's not the SDA effect, but what do I know.
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I think that's called too many plastic Coors Light and not enough hot dogs.CTC BBQ Amplifier, Sonic Frontiers Line3 Pre-Amplifier and Wadia 581 SACD player. Speakers? Always changing but for now, Mission Argonauts I picked up for $50 bucks, mint.
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I thought it was understood that it's not an effect, it's a "technology".
~ In search of accurate reproduction of music. Real sound is my reference and while perfection may not be attainable? If I chase it, I might just catch excellence. ~ -
A rudimentary description of SDA would be it eliminates the delay of sound to the opposite ear.
What you heard was the jet traveling as fast as the sound which was behind the jet. At the speed the jet was flying and based on where you were standing the sound wave couldn't overtake the speed of the jet so you heard the sound after the jet passed by.
Had it been traveling faster than the speed of sound it's called super sonic and you would have heard a loud boom ala the Concorde jet or jet fighter reaching and exceeding the speed of sound.
Not really how SDA works."Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul! -
Errr... it's far simpler: That's the difference between the speed of light and the speed of sound. A 1 mile distance, they'll be about 5 seconds apart.Gallo Ref 3.1 : Bryston 4b SST : Musical fidelity CD Pre : VPI HW-19
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i know...it wasn't actually SDA:rolleyes: quite similar tho. when you're looking @ an object and it's sound is moving somewhere totally different. quite a trip. not entirely unlike SDAs
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I think that's called too many plastic Coors Light and not enough hot dogs.
no coors:eek: i had a 3+ hour drive to get there and i returned later in the day. it was fkn hot tho -
A rudimentary description of SDA would be it eliminates the delay of sound to the opposite ear.
What you heard was the jet traveling as fast as the sound which was behind the jet. At the speed the jet was flying and based on where you were standing the sound wave couldn't overtake the speed of the jet so you heard the sound after the jet passed by.
Had it been traveling faster than the speed of sound it's called super sonic and you would have heard a loud boom ala the Concorde jet or jet fighter reaching and exceeding the speed of sound.
Not really how SDA works.
good explanation;) -
Yea, there's usually some SDA nerd who doesn't get the humor.CTC BBQ Amplifier, Sonic Frontiers Line3 Pre-Amplifier and Wadia 581 SACD player. Speakers? Always changing but for now, Mission Argonauts I picked up for $50 bucks, mint.
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Airshows rock. I grew up going to them with dad in the AF, so I have seen more than a couple
Nothing, and I do mean nothing, compares to the power of a jet flying hard and low.....Glad you enjoyed! 2007 Club Polk Football Pool Champ
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good explanation;)
Thanks and I do get where you are coming from as far as the experience. They just started having an annual air show at our airport and maybe it's time to check it out again. I haven't been to one in years "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul! -
Yea, there's usually some SDA nerd who doesn't get the humor.
Guilty of being too literal on this one."Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul! -
Guilty of being too literal on this one.
That was a sexy explanation tho'.....mmmm, hot damn it was.CTC BBQ Amplifier, Sonic Frontiers Line3 Pre-Amplifier and Wadia 581 SACD player. Speakers? Always changing but for now, Mission Argonauts I picked up for $50 bucks, mint. -
When I was stationed at Luke AFB in AZ, we had F-16 demo responsibility for any western air shows. This guy would go out everyday late morning after the first sorties of the day were done and fly his demo. One day he was desending from a loop and as he started loading the g's to pull out at the bottom, a mass of vapor showed up over the canopy. A rapid boom-boom! We looked at the HUD camera tape later and watched his descent and pull-up. The mach number wound rapidly up to .98 (he yanked the throttle back at .95) - the whole jet didn't go supersonic, but the air over the canopy did! No damage done, but it was kewl to see.
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This thread is worthless without pics. Political Correctness'.........defined
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An F-15 low pass gives me wood.
B-52 ... Stratofortress .... bomb bay doors open .... dumping its guts all over kingdom come ...... now THAT'S a wood popper !
<object width="425" height="355"><param name="movie" value="http://www.youtube.com/v/U1qPWN-uV0I&hl=en"></param><param name="wmode" value="transparent"></param><embed src="http://www.youtube.com/v/U1qPWN-uV0I&hl=en" type="application/x-shockwave-flash" wmode="transparent" width="425" height="355"></embed></object>This thread is worthless without pics.
Well .... I don't have actual pictures but ..... well .... this picture is an excellent simulation.
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