Phase coherent, low cost, 4th order XO - Page 2

Hartono · 14th April 2003, 05:44 AM

miss many excellent food on lygon street , little bourke

Pedja · 14th April 2003, 03:33 PM

Hello Hartono,

Strictly speaking, you’re right, LR is not phase coherent. But among the stock crossovers it has the best transient behavior. It has linear amplitude response, and phase aligned sections (assuming inverted absolute phase).

Everyone can try to achieve better transient behavior.

If it is any important, I’m the 1st order XOs fan.

Btw, crossover can be phase coherent and still not transient perfect if doesn’t have linear amplitude response.

Here are the transient behaviors of the 2nd order, 2-way, 3000Hz crossovers.

Pedja

Pedja · 14th April 2003, 03:45 PM

What is happening with this site? Yesterday and today every posting goes slooooooow. Now, I want to upload pic 822x448, 29kB, and it says to "please upload pic less than 1200x800" or something like that!!!

Pedja · 14th April 2003, 05:36 PM

Green is input, red is low pass, blue is high pass, and black is summed response (tweeter with inverted polarity).

Pedja · 14th April 2003, 05:40 PM

Hmmm, site agreed that 707x448 is not bigger than 1200x800

(but still thinks 822x448 is bigger

).

Pedja · 14th April 2003, 05:41 PM

...

grataku · 14th April 2003, 06:22 PM

Pedia
what are you doing feeding a squarewave into a filter? What's that supposed to tell you?
Ok, the transient response is better, phase coherence is way overrated.

Pedja · 14th April 2003, 06:29 PM

In the post No12 of this thread it should read:

It has linear amplitude response, and phase aligned sections (assuming inverted absolute phase of the tweeter).

Pedja

Pedja · 14th April 2003, 07:29 PM

Hello Grataku,

Just wanted to show how does it looks.

I’m not pro-Linkwitz side here.

It might be the phase coherence is overrated, but it is sure the careful approach to the speaker’s phase behavior is not a waste of time. And it may be I like 1st order crossover because it is phase coherent, but it might be there are also some other (and more important) reasons for that.

Pedja

capslock · 15th April 2003, 08:47 AM

Is adding a constant or frequency-dependent delay to one branch of the LR going to make things "look" nicer? I seem to remember LR is 360° out of phase at the XO point, but I'd have to undig the article or do the math or simulatin myself.

Regards,

Eric

14th April 2003, 05:44 AM	#11
Hartono diyAudio Member Join Date: Nov 2002 Location: currently in China	it is relevant miss many excellent food on lygon street , little bourke

14th April 2003, 06:29 PM	#18
Pedja diyAudio Member Join Date: Jun 2002 Location: Serbia	correction In the post No12 of this thread it should read: It has linear amplitude response, and phase aligned sections (assuming inverted absolute phase of the tweeter). Pedja

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14th April 2003, 03:33 PM	#12
Pedja diyAudio Member Join Date: Jun 2002 Location: Serbia	Hello Hartono, Strictly speaking, you’re right, LR is not phase coherent. But among the stock crossovers it has the best transient behavior. It has linear amplitude response, and phase aligned sections (assuming inverted absolute phase). Everyone can try to achieve better transient behavior. If it is any important, I’m the 1st order XOs fan. Btw, crossover can be phase coherent and still not transient perfect if doesn’t have linear amplitude response. Here are the transient behaviors of the 2nd order, 2-way, 3000Hz crossovers. Pedja

14th April 2003, 03:45 PM	#13
Pedja diyAudio Member Join Date: Jun 2002 Location: Serbia	What is happening with this site? Yesterday and today every posting goes slooooooow. Now, I want to upload pic 822x448, 29kB, and it says to "please upload pic less than 1200x800" or something like that!!!

14th April 2003, 06:22 PM	#17
grataku diyAudio Member Join Date: Dec 2000 Location: -	Pedia what are you doing feeding a squarewave into a filter? What's that supposed to tell you? Ok, the transient response is better, phase coherence is way overrated.

14th April 2003, 07:29 PM	#19
Pedja diyAudio Member Join Date: Jun 2002 Location: Serbia	Hello Grataku, Just wanted to show how does it looks. I’m not pro-Linkwitz side here. It might be the phase coherence is overrated, but it is sure the careful approach to the speaker’s phase behavior is not a waste of time. And it may be I like 1st order crossover because it is phase coherent, but it might be there are also some other (and more important) reasons for that. Pedja

15th April 2003, 08:47 AM	#20
capslock diyAudio Member Join Date: Feb 2002 Location: Germany	Is adding a constant or frequency-dependent delay to one branch of the LR going to make things "look" nicer? I seem to remember LR is 360° out of phase at the XO point, but I'd have to undig the article or do the math or simulatin myself. Regards, Eric

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