Choosing drivers for LR active crossover

goldyrathore · 14th April 2004, 06:37 AM

I find passive custom crossovers hard to understand. So I want to take the active route. I believe some drivers lend themselves to active crossovers. How do I choose drivers for an LR 12db/octave or LR 24 db/octave. LR is going to be 'in phase' at crossover but the drivers are not. I mean take for example a crossover point of 3k. If you see tweeter and woofer response at 3K they will be at different phases. Why is this phase difference not taken into consideration in LR crossover? So how does this combination give a good sound?

Thanks in advance,
goldy

goldyrathore · 24th May 2004, 03:58 PM

Hi,
In one of the articles in Elektor Electronics, Mr T Giesbert, the author of the active two way project says that Linkwitz-Riley filter had problems creating soundstage with Visaton drivers. However Buttorworth filter gave better results. I thought LR was better. So I come back to the question, I know I will be playing with either 12db/octave LR Or 24db/Octave LR. But how do I choose drivers. What params say that a particular set of drivers are going to match well if LR is used.
Thanks in advance,
Goldy

tiroth · 24th May 2004, 04:17 PM

It is really almost nonsensical to ask what drivers will sound good with a crossover. You can define some goals, such as about where the xover points should be, and use that to narrow your choice of drivers. But the final crossover should be developed based on the driver choices. You won't know until then the acoustic rolloff, phase issues, etc.

Drew Eckhardt · 24th May 2004, 04:34 PM

Quote:

Originally posted by goldyrathore
LR is going to be 'in phase' at crossover but the drivers are not. I mean take for example a crossover point of 3k. If you see tweeter and woofer response at 3K they will be at different phases. Why is this phase difference not taken into consideration in LR crossover? So how does this combination give a good sound?

Some people believe that it's silly to make an active cross-over without time alignment so that the drivers are acoustically in-phase at the cross-over point.

SL's All-pass filter

tiroth · 24th May 2004, 08:36 PM

That's like saying it is silly to make a "normal" (passive) speaker without time alignment.

It can certainly add something, but isn't a requirement.

14th April 2004, 06:37 AM	#1
goldyrathore diyAudio Member Join Date: Nov 2002 Location: Bangalore, India	Choosing drivers for LR active crossover I find passive custom crossovers hard to understand. So I want to take the active route. I believe some drivers lend themselves to active crossovers. How do I choose drivers for an LR 12db/octave or LR 24 db/octave. LR is going to be 'in phase' at crossover but the drivers are not. I mean take for example a crossover point of 3k. If you see tweeter and woofer response at 3K they will be at different phases. Why is this phase difference not taken into consideration in LR crossover? So how does this combination give a good sound? Thanks in advance, goldy __________________ Audio enthusiast/hobbyist

24th May 2004, 03:58 PM	#2
goldyrathore diyAudio Member Join Date: Nov 2002 Location: Bangalore, India	To put it differently Hi, In one of the articles in Elektor Electronics, Mr T Giesbert, the author of the active two way project says that Linkwitz-Riley filter had problems creating soundstage with Visaton drivers. However Buttorworth filter gave better results. I thought LR was better. So I come back to the question, I know I will be playing with either 12db/octave LR Or 24db/Octave LR. But how do I choose drivers. What params say that a particular set of drivers are going to match well if LR is used. Thanks in advance, Goldy __________________ Audio enthusiast/hobbyist

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24th May 2004, 04:17 PM	#3
tiroth diyAudio Member Join Date: Dec 2001 Location: Pittsburgh, PA, USA	It is really almost nonsensical to ask what drivers will sound good with a crossover. You can define some goals, such as about where the xover points should be, and use that to narrow your choice of drivers. But the final crossover should be developed based on the driver choices. You won't know until then the acoustic rolloff, phase issues, etc.

24th May 2004, 08:36 PM	#5
tiroth diyAudio Member Join Date: Dec 2001 Location: Pittsburgh, PA, USA	That's like saying it is silly to make a "normal" (passive) speaker without time alignment. It can certainly add something, but isn't a requirement.

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