Do you love time correction? Yes or no and why?

[helotaxi 5,000+ posts]

yes, I remember ....... I am in my mid 40's. You had to do SQ, then SPL, then RTA all in a row - with absolutely NO changes to the system in between. It fell apart when electronic EQ's became popular because it was so easy to cheat that it wasn't worth policing it.

IIRC, IASCA allowed you to make changes between the different phases of judging but you only had a short amount of time to do it. That's where the multiple EQs came into play. Turn one off and another one on to make your changes really quickly. That coupled with remote gain for the subs to make the change into and out of SPL mode.

 

[audiolife 5,000+ posts]

IIRC, IASCA allowed you to make changes between the different phases of judging but you only had a short amount of time to do it. That's where the multiple EQs came into play. Turn one off and another one on to make your changes really quickly. That coupled with remote gain for the subs to make the change into and out of SPL mode.

you would be correct hence the use of 3 eqt's. i remember in 96 and 97 they gave you 30 seconds to make adjustments and i remember how the pioneer odr guys used to be all calm and cool hitting a couple buttons via remote control and being set LOL

 

[PaulD 10+ year member]

I was talking much earlier than that ..... '91- '92 or so

 

[FoxPro5 5,000+ posts]

Yes, till I move my head. Die stereo die! //content.invisioncic.com/y282845/emoticons/crying.gif.ec0ebefe590df0251476573bc49e46d8.gif

 

[Torgus 10+ year member]

i'm amazed the human ear can tell the difference...

speed of sound at sea level = 340.29 miles per second

or

1,129 feet per second

so .001 of a second is = to 1.129 feet

so if the speaker is 4 feet away from you it takes roughly .004 or 4 thousandths of a second to reach your ears from speaker...

now if you other speaker is say only 3 feet away it would take .003 or 3 thousandths of a second for it to reach your ear.

the difference in this case is .001 or 1 thousandth of a second.

i find it hard to believe the human brain can tell the difference of a .001 of a second difference in sound. and since we are listening in stereo each ears will be receiving difference sounds as it's not mono...so what does it matter if it doesn't reach our ears at exactly the same time?

i guarantee if you set up a room, chair in the middle and two speakers in optimal equidistant from them selfs and the chair and had one speaker sending even .009 music/sounds behind another speaker playing a song/note/sounds no one would be able to tell the difference or which speaker was sending the sound slower or any difference whatsoever...

as far as i understand time alignment it's important in big amphitheaters and the such where you have thousands of feet between speakers and such..

i think it's a marketing gimmic...but thats just me and have not have had success using it.

and unless i'm mistaken most high end head units don't offer this in any way shape or form.

please correct me if i'm wrong guys...like with facts if possible.

 

[audiolife 5,000+ posts]

i'm amazed the human ear can tell the difference...
speed of sound at sea level = 340.29 miles per second

or

1,129 feet per second

so .001 of a second is = to 1.129 feet

so if the speaker is 4 feet away from you it takes roughly .004 or 4 thousandths of a second to reach your ears from speaker...

now if you other speaker is say only 3 feet away it would take .003 or 3 thousandths of a second for it to reach your ear.

the difference in this case is .001 or 1 thousandth of a second.

i find it hard to believe the human brain can tell the difference of a .001 of a second difference in sound. and since we are listening in stereo each ears will be receiving difference sounds as it's not mono...so what does it matter if it doesn't reach our ears at exactly the same time?

i guarantee if you set up a room, chair in the middle and two speakers in optimal equidistant from them selfs and the chair and had one speaker sending even .009 music/sounds behind another speaker playing a song/note/sounds no one would be able to tell the difference or which speaker was sending the sound slower or any difference whatsoever...

as far as i understand time alignment it's important in big amphitheaters and the such where you have thousands of feet between speakers and such..

i think it's a marketing gimmic...but thats just me and have not have had success using it.

and unless i'm mistaken most high end head units don't offer this in any way shape or form.

please correct me if i'm wrong guys...like with facts if possible.

makes a huge difference in the perception of your soundstage. stops/causes cloudiness and can totally change the "shape" of the vehicle, thing is it only corrects for one point. on my processor i can make my truck sound HUGE but it wont center very well LOL

 

[BEAVER.989 10+ year member]

i'm amazed the human ear can tell the difference...
speed of sound at sea level = 340.29 miles per second

or

1,129 feet per second

so .001 of a second is = to 1.129 feet

so if the speaker is 4 feet away from you it takes roughly .004 or 4 thousandths of a second to reach your ears from speaker...

now if you other speaker is say only 3 feet away it would take .003 or 3 thousandths of a second for it to reach your ear.

the difference in this case is .001 or 1 thousandth of a second.

i find it hard to believe the human brain can tell the difference of a .001 of a second difference in sound. and since we are listening in stereo each ears will be receiving difference sounds as it's not mono...so what does it matter if it doesn't reach our ears at exactly the same time?

i guarantee if you set up a room, chair in the middle and two speakers in optimal equidistant from them selfs and the chair and had one speaker sending even .009 music/sounds behind another speaker playing a song/note/sounds no one would be able to tell the difference or which speaker was sending the sound slower or any difference whatsoever...

as far as i understand time alignment it's important in big amphitheaters and the such where you have thousands of feet between speakers and such..

i think it's a marketing gimmic...but thats just me and have not have had success using it.

and unless i'm mistaken most high end head units don't offer this in any way shape or form.

please correct me if i'm wrong guys...like with facts if possible.

If you had it, you'd know it is very useful in shifting your image. By delaying one of my mids, I can make the stage move all the way from one side of my dash to the other.

 

[squeak9798 5,000+ posts]

i'm amazed the human ear can tell the difference...
speed of sound at sea level = 340.29 miles per second

or

1,129 feet per second

so .001 of a second is = to 1.129 feet

so if the speaker is 4 feet away from you it takes roughly .004 or 4 thousandths of a second to reach your ears from speaker...

now if you other speaker is say only 3 feet away it would take .003 or 3 thousandths of a second for it to reach your ear.

the difference in this case is .001 or 1 thousandth of a second.

i find it hard to believe the human brain can tell the difference of a .001 of a second difference in sound. and since we are listening in stereo each ears will be receiving difference sounds as it's not mono...so what does it matter if it doesn't reach our ears at exactly the same time?

i guarantee if you set up a room, chair in the middle and two speakers in optimal equidistant from them selfs and the chair and had one speaker sending even .009 music/sounds behind another speaker playing a song/note/sounds no one would be able to tell the difference or which speaker was sending the sound slower or any difference whatsoever...

as far as i understand time alignment it's important in big amphitheaters and the such where you have thousands of feet between speakers and such..

i think it's a marketing gimmic...but thats just me and have not have had success using it.

and unless i'm mistaken most high end head units don't offer this in any way shape or form.

please correct me if i'm wrong guys...like with facts if possible.

I just barely skimmed the article, so I'm not about to defend it's (the paper's) position or experiments in any manor. But since you asked for scientific evidence, this seems to scientifically support the hypothesis that differences of milliseconds will indeed alter our perception of sound.

Audibility of time alignment of acoustic signals

The temporal acuity of human hearing is more sensitive than implied by its single-tone high frequency limit and it is a principal consideration affecting transparency in audio reproduction. This places stringent requirements on the proper time alignment of speakers and on the temporal responses of components. Blind tests were conducted here to assess the discernability of time alignment between spatially displaced speakers. The experiment found a displacement threshold of d≈2 mm corresponding to a delay discrimination of Δt≈6 μs [6 microseconds].

Conclusions

Since the approaches in these two experiments

are quite different (one using a spatial displacement to

temporally spread out the waveform and the other using

an electronic circuit to introduce temporal convolution),

it seems that a value in the 7 μs [7 microseconds] vicinity is certainly a

solid upperbound on the actual intrinsic resolution.

As far as audio reproduction is concerned, the main

thing that matters is the fact that time scales in the

microsecond range can be discriminated—

http://www.physics.sc.edu/kunchur/papers/alignment.pdf

It's also rather easy to prove experimentally by sitting in a vehicle with time alignment and playing with the control //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

As far as headunits go....no, must ultra-high-dollar units (McIntosh or Nakamichi, for example) do not offer time alignment, or any other form of higher-level tuning (EQ, advanced crossovers) either. So I wouldn't assume their lack of features is from a lack of need for the features //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif