phase and time
07-06-2005, 09:00 PM
#11
2000 Watt CAFz'r
Join Date: May 2000
Posts: 2,406
define your definition of amplitude, cause it certainly can affect phase and time of the speakers around it, usually not that actual speaker, but it can affect everything else.............
sweet91sc (Joe Yau) has a tef.................they are very cool and will change how you look at sound after seeing one in action............
sweet91sc (Joe Yau) has a tef.................they are very cool and will change how you look at sound after seeing one in action............
07-06-2005, 09:48 PM
#13
Guest
Posts: n/a
tim is getting at exactly what i was talking about with my friend today, how or even does amplitude effect phase and time in a closed environment , like a vehicle, the tef came up in our conversation today but i wanted to hear peoples first reaction, tef came up a bit quicker that i expected but wasnt unexpected
07-07-2005, 01:16 PM
#14
Guest
Posts: n/a
lets think more scientifically, if you adjust time by 1ms, how have you just affected phase in terms of dergrees of phase adjustment. does anyone think that there is a mathematical equation for this.
I am sure there is some crazy algorythim for calculating it. But phase is affected by frequency, so correcting at one frequency may put another even more out of time alignment.
Lets look at an example - a midrange that operates from 300-3500hz. Delay that midrange by 1ms and you have moved it's absolute phase by 108degrees at 300hz but 180degrees (really 1260degrees but the net is 180) at 3500hz. Combine that with the fact that a speaker has it's own phase signature and you better buy extra bateries for your calculator...
Changing Phase directly though may or may not affect time - it would depend on how the processor works. But looking at how phase and time are related it is my opinion that all a person can do is shoot for the best compromise between the two.
07-07-2005, 03:49 PM
#17
Yankee
Join Date: Oct 2003
Posts: 3,599
To physically TA drivers the woofer is closest, then the mid with the tweeter farthest away. To accomplish this with simple TA or even a time delay per driver, as Dukk discussed is difficult, a TA slope based on frequency is what Dukk is suggesting.
The concept kind of reminds me of Quads tone controls which would slope the entire HF or LF band (like a teeter tauter (SP)) with a center of 800 Hz or so.
This is pie in the sky since drivers are located willie nillie
The concept kind of reminds me of Quads tone controls which would slope the entire HF or LF band (like a teeter tauter (SP)) with a center of 800 Hz or so.
This is pie in the sky since drivers are located willie nillie
07-07-2005, 04:23 PM
#19
when you change the phase, you change the location of the amplitude peaks/valleys, which in turn changes the relative time that those peaks and valleys hit your ear. Essentially, if you modify one, you modify all, BUT if the result is a true improvement, then you have hit on something incredible, because by changing one, you have a cascading effect on the others based on frequency, driver parameters, Speed of the travel of frequencies, changed air currents, phase cancellation and a multitude of other issues that can make or break any true improvement,
