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Old 11th April 2013, 01:34 PM   #1
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Default Crossover build

Hello everybody, I am a musician in an orchestra without the nessesary understanding of crossover build!
I love to build fullrange enclosures but now I capitulate with my next project.
A friend of mine sold me his Altec 806A/Isophon Orchester combi. Sounds very good!
http://my.funpic.de/show-photo/730429-PIC.jpg
Now I am interested in a pair of Altec 3156 for a original cabinet made for this driver. The 8156X...
Here I already have made from some other cabinets from a AN12 project.
http://my.funpic.de/show-photo/730430-PIC.jpg
I am interested in the sound from these two Altec drivers playing together!

Now my question: When I combine these two, what crossover do I put in front of the 3156? And : can I just remove the 806A driver crossover and put it in the box of the 3156 next to the 3156 crossover tangeled like in my combo Altec/Isophon?
I have the specs of each driver! If somebody needs details...
Greets from germany, chris
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Old 11th April 2013, 01:36 PM   #2
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Click the image to open in full size.
Click the image to open in full size.

Last edited by hifisucks; 11th April 2013 at 01:39 PM.
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Old 12th April 2013, 12:03 AM   #3
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Each driver has different impedance/frequency characteristics, so for best results a crossover which matches these needs to be used. Post the specs & let's see how different the drivers are...
(Do you have a schematic of the crossover you're using?)
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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 12th April 2013, 05:22 AM   #4
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Hi, thanks for your time!Click the image to open in full size.
Click the image to open in full size.
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Old 12th April 2013, 06:26 AM   #5
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I just whipped over these fotos before bringing the kids to school...
My first concern would be not wanting to smash the 806a driver putting in something I measured on the internet...
Is it desired to put a 24dB/octave in front of the 806a just to make sure that 500Hz is lowist to go?
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Old 12th April 2013, 06:27 AM   #6
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If your crossover is the N-800D, you should have no problem just connecting up the 3156 to see how it sounds, it may not be the ideal crossover (just a textbook 2nd order by the look of it), but you should be able to adjust the level of the 806 to match.

N-800 schematic:
http://alteclansingunofficial.nlenet...ers/TL_121.pdf
3156 Datasheet:
http://www.greatplainsaudio.com/vint...spec_sheet.pdf

re:Is it desired to put a 24dB/octave in front of the 806a just to make sure that 500Hz is lowist to go? " - yes, definitely
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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 12th April 2013, 06:42 AM   #7
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Hi, I dont have the schematic of the speakers already used...but I think your N-800D suggestion is a very good approach. So, 12dB slope at 800Hz will be good for the 806a?
Greets
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