I am designing satellite speakers. this has one tweeter, mid woofer.
I mid woofer is 4 Ohms. so I designed crossover to suit 4Ohms driver. Now the upper cut off is at 3.5KHz and lower is 100Hz. Baffle diffraction correction is at 1 KHz. now my problem is, if I connect correction circuit between driver and crossover filter. Then the impedance of driver seen by crossover is frequency dependent. So this might lead to improper functioning of crossover filter.
Am I right? What Do I do ?
I mid woofer is 4 Ohms. so I designed crossover to suit 4Ohms driver. Now the upper cut off is at 3.5KHz and lower is 100Hz. Baffle diffraction correction is at 1 KHz. now my problem is, if I connect correction circuit between driver and crossover filter. Then the impedance of driver seen by crossover is frequency dependent. So this might lead to improper functioning of crossover filter.
Am I right? What Do I do ?
A loudspeaker x-over network is always frequency dependent. A loudspeaker is not a resistive load.
Besides that you have to take into account that there is no speaker with a perfect frequency response. So a theoretical calculation, based on a 4 ohm resistive load will yield results far from reality.
Besides that you have to take into account that there is no speaker with a perfect frequency response. So a theoretical calculation, based on a 4 ohm resistive load will yield results far from reality.
Probably because most posters here are into single driver speakers and the word "crossover" is only spoken softly.
Bob
Assuming I understand what you're doing....
Let's say you have a plexiglass tube, 3" x 12". You want to fill it 1/2 full of yellow water and 1/6 full of red water. Your questions equates to saying, "After I pour in the yellow water and start pouring in the red water, it mixes and makes orange, so I can't see how much red water I've added."
You can't "stack" passive filter sections. The inductor in your crossover will combine with the inductor in your baffle correction circuit and you'll get one roll-off, not two.
Let's say you have a plexiglass tube, 3" x 12". You want to fill it 1/2 full of yellow water and 1/6 full of red water. Your questions equates to saying, "After I pour in the yellow water and start pouring in the red water, it mixes and makes orange, so I can't see how much red water I've added."
You can't "stack" passive filter sections. The inductor in your crossover will combine with the inductor in your baffle correction circuit and you'll get one roll-off, not two.
Ah, yes, now I understand. You don't have a Zobel.
Maybe this 3rd order low pass looks familiar:
I'd follow Rod's advice, myself:
Baffle Step Compensation
And that's Miss Keriwena to you.
Maybe this 3rd order low pass looks familiar:
An externally hosted image should be here but it was not working when we last tested it.
I'd follow Rod's advice, myself:
Baffle Step Compensation
And that's Miss Keriwena to you.
Rod has put a lot good words on Baffle Step Compensation (BSC). Rather I say he has put lot of explanation on Audio. His site is one of my favorite bookmark.
I am looking for a deeper explanation. A simple question for you, which two sides would you use? so would say other two sides ( of four sides) has no effect on BSC ?
I got some link more on BSC. read it too.
I use Edge for deeper calculations.
Still the actual curves are nearly same. I wont say you strictly need Edge. but its better.
I am looking for a deeper explanation. A simple question for you, which two sides would you use? so would say other two sides ( of four sides) has no effect on BSC ?
I got some link more on BSC. read it too.
I use Edge for deeper calculations.
Still the actual curves are nearly same. I wont say you strictly need Edge. but its better.
Considering your original question, what I was hoping you'd pick up from Ron's page was that the best place for baffle step EQ is before the power amp. That way the amp acts as a buffer, and prevents interaction between the BS EQ and your Xover components. In other words, yes, you are right, and I think this is what you should do.
And his other worthy point is "room gain" often counteracts the baffle step problem to a great extent. That's why he made his EQ adjustable. In my rather small room, I haven't seen any baffle step in my measurements.
And his other worthy point is "room gain" often counteracts the baffle step problem to a great extent. That's why he made his EQ adjustable. In my rather small room, I haven't seen any baffle step in my measurements.
Hi there,
I am designing some speakers for outside use, and the article you lot have been discussing is a very interesting one indeed.
My question is that what you are using a very displaced-from-centre driver(as with most boomboxes) how do you measure the baffle width ?, distance to the nearest edge ? overall baffle width regardless of positioning? does the distance or width vertically matter ?
Thanks for the help
I am designing some speakers for outside use, and the article you lot have been discussing is a very interesting one indeed.
My question is that what you are using a very displaced-from-centre driver(as with most boomboxes) how do you measure the baffle width ?, distance to the nearest edge ? overall baffle width regardless of positioning? does the distance or width vertically matter ?
Thanks for the help
polop welcome to the thread,
Well, I would advice you to check if people really go for BS EQ for system which is played outside. I do not have any experience of Loudspeakers for outdoor use.
But if to carry on discussion with your queries, the BS calculation are made on exact positioning of driver (not necessary center)
Check my post No.10 you will find link for Edge software. It perfectly calculates everything needed.
Well, I would advice you to check if people really go for BS EQ for system which is played outside. I do not have any experience of Loudspeakers for outdoor use.
But if to carry on discussion with your queries, the BS calculation are made on exact positioning of driver (not necessary center)
Check my post No.10 you will find link for Edge software. It perfectly calculates everything needed.
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