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............

i think joe is going to be my next best friend

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yellow car with mtx system in it.

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

The calculation is easy and Dereck is on the right track.

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.

isent that what all car audio is about, comprimise?

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yellow car with mtx system in it.

^ no persuit of perfection is what it is all about, compromise is the side road we all live on

[ July 07, 2005, 04:50 PM: Message edited by: JohnVroom ]

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MECA SQ

www.cardomain.com/memberpage/769882

I don't know what your problem is, but I'll bet it's hard to pronounce.

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

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MECA SQ

www.cardomain.com/memberpage/769882

I don't know what your problem is, but I'll bet it's hard to pronounce.

how do you think phase changes with with amplitude?

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,

so if phase response changes with amplitude, what does time do, because time is constant, isnt it?