I am needing some passive crossover to use with my dual amplification system - diyAudio
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Old 18th September 2009, 01:34 PM   #1
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Default I am needing some passive crossover to use with my dual amplification system

I have a channel for bass purposes and a channel for mids and high frequencies.

I am thinking to let the bass amplifier filtered in a such way i gonna have lower than 300 hertz frequencies.

So, i am needing a filter to 300 to 1Kilohertz, from 1 Kilohertz to 5 kilohertz and another above 5 kilohertz...a three way.

This first frequency is for some kinds of percursive instruments as some small drums and some voices too.

I would like to have some schematics suggested by forum folks, i can arrange the frequencies by myself tweeking capacitors, resistances and inductances... a schematic, or many schematics, showing different passive crossover filters for speaker will be very helpfull.

Can you help?... so post it here, schematics or sketches or scratches, hand made draw and so on.

http://www.youtube.com/watch?v=Ew7Sr1IA6h8

http://www.youtube.com/watch?v=q5NVcpmoVaQ

http://www.youtube.com/watch?v=rljMY96z13M

regards,

Carlos
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Last edited by destroyer X; 18th September 2009 at 01:56 PM.
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Old 18th September 2009, 05:35 PM   #2
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Default I have found this one, and i can modify the one for my needs

Thank you guys..... not needed, already found.

regards,

Carlos
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File Type: jpg Passive crossover.jpg (494.2 KB, 126 views)
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Old 18th September 2009, 10:03 PM   #3
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Hi Carlos,
Is that the Selenium HM17-25 horn with the DH200E driver?
I am using that horn with the DT150 (OEM) driver tweeter. You really need a tweeter with the first DH200E driver (~1K5-8K0Hz, call it mid). You would have a main mid-bass to 1K5 or 1K6Hz (main speaker) and a tweeter or super tweeter (7K5/8K and up).

Last edited by Inductor; 18th September 2009 at 10:06 PM.
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Old 19th September 2009, 01:59 AM   #4
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If you’re using a separate amp for the Bass driver PLLXO is a better way to go;
http://www.t-linespeakers.org/tech/f...ssiveHLxo.html

4th order is expensive, is it really necessary?
calulators & schematics for other orders here:
http://ccs.exl.info/calc_cr.html

Note: you need to use the actual impedance of the driver at the xover freq, but I'm sure you knew that :-)
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Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency
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Old 19th September 2009, 04:17 AM   #5
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Default No....they are not Selenium drivers..the midrange driver and the tweeter drivers

are from Bravox Professional line...the woofer is Oversound, you can see them in the youtube links..the pictures are there.

Thank you (both) by the cooperation.

Here you have a small slide movie that shows the drivers i'm using:

http://www.youtube.com/watch?v=rljMY96z13M

regards,

Carlos
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Old 19th September 2009, 11:44 AM   #6
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Hi Carlos,

If you want the best results you should meausre the impedance of all of the drivers (well at least the mid and tweeter, as it sounds like the woofer will be active, perhaps with a PLLXO). As an accomplished amp builder I think that building an impedance jig and doing some measurements with speaker workshop shouldn't be too much problem for you if you do decide to do this then the speaker workshop manual and Claudio's tutorial in the downloads section of his home page will help to avoid much hair pulling

The main reason for doing these measurements is that all speakers (regardless of nominal impedance) have varying impedance with freq, largely due to the back emf effects of currents induced in the voice coil as it moves past the magnet... This is different for every driver, and as a result what would seem to be the right values (assuming a nominal 8 ohm impedance for instance) can actually be far from optimal.

If you can find a spec sheet for the drivers with an impedance plot, then that will be better than nothing, but measuring yourself will give the best results Once you know the impedance at the freq you want to cross at then you can use that in the formula to calculate the nominal values you need... This should reduce the ammount of tweaking you would need if you were to go with a text book design. Ideally you should also have freq response date (again you can used published specs, but better if you can measure yourself), but having said all this, my three ways use pre-built crossovers which are far from optimal and still sound ok

Tony.
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Old 19th September 2009, 11:50 AM   #7
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Default Thank you wintermute..... i will read that.

I have not appreciate your pictures..i could not see you....only nature, no humans there..alike an empty world, without humans....only one group of tree..and all them covered by shadows...maybe you like an empty world.. rid of humans.

But, for sure you are a great photographer, sadly do not turn the camera to yourself and family.... exactly were the big fun is.

Humans are all different, style of life is very interesting...nature is fine..but secondary to me.

Well..you have not published to me....my note is 5 (five)

ahahahahah!

regards,

Carlos
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Old 19th September 2009, 12:47 PM   #8
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Hi Carlos, try the main page in the link is just a set of photos that people have made their favourites http://www.flickr.com/photos/thorton/ has a much larger selection of photos not too many of me and my family though, I am shy in that regard... There are some there but they are not visible to the internet at large One of the few exceptions is this one taken in 2005 in china there is also this one.

and thank you for the compliment!

Tony.
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Old 19th September 2009, 06:45 PM   #9
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Default Mya made me cry because emotion..there's no better moment in our live as the moment

our babies born.

In special when they are girls!...they are lovely..our dolls.

You are a very good photographer, and now, as you have humans too, your note climbed to 10!

Congratulations...nice camera too...special skills are needed to do those wonderfull pictures you have made.

http://www.youtube.com/watch?v=Aybx2UVWtQ4

regards,

Carlos
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Last edited by destroyer X; 19th September 2009 at 06:52 PM.
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Old 19th September 2009, 07:09 PM   #10
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Somehow,Carlos,you've found your way in splitting genes instead of frequencies!
Congratulations!
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