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Old 9th February 2011, 09:53 AM   #1
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Default Need help with 2 way crossover design

Hi, I am making a portable speaker system, and I need to design a crossover. I have a pair of 6" 4Ohm Celestion Mid speakers (came out of a 3 way system) and I am going to buy a pair of Vifa 4Ohm XT25SC90-04's from the internet. I tried calculating a crossover (at 2500Hz) on 2-Way Crossover Designer / Calculator but I have no idea which crossover type to use. Could someone tell me which one to use and also explain what the difference between the crossover types?
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Old 11th February 2011, 04:58 AM   #2
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So I did some research, found one site that said to use second order and another that said I should use a Butterworth design, Is a Second order Butterworth what I should be using for what I want to do?
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Old 11th February 2011, 07:41 AM   #3
Francec is offline Francec  Australia
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Since you haven't provided sufficient information about the 6" drivers, I don't think anyone is able to assist you. Do you have the T/S parameters or a link?

Frank
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Old 11th February 2011, 09:24 AM   #4
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Unfortunately I bought them second hand and am not sure what the specs are apart from them being 4Ohm. As far as I can tell though, They are the mid ranges from a Celestion Ditton 44.

Here's a Pic I found on and old eBay Listing here
Click the image to open in full size.Click the image to open in full size.

And here's mine
Click the image to open in full size.

And here's the page for the tweeters I bought.

Sorry 'bout this. I'm only just getting into speakers and stuff (well I have been into speakers for a while, got a little collection going, but I'm just starting with the DIY stuff) and this is my first project.
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Old 11th February 2011, 09:34 AM   #5
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Quote:
Originally Posted by Needadispenserhere View Post
As far as I can tell though, They are the mid ranges from a Celestion Ditton 44.
Even before i read that they screamed British. They do look like Celestions. You will need to get them measured if you want to get optimum bottom out of them.

A smallish sealed box would be safe, these are reminisant of early B110, but with a better basket.

dave
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Old 11th February 2011, 09:40 AM   #6
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Would I need to put them in a box to get them measured? Because I have no idea what the dimensions of the box should be. When I first bought them I tested them out by making a box out of a shoe box

Getting them tested would be a professional thing, right? I couldn't just stick a mic in front of them and do it with my PC?
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Old 11th February 2011, 09:44 AM   #7
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I do not know these drivers. Though, as they were used as midrange drivers, are they suited for a 2 way design?
Will they go low enough?
Isn't the Xmax too short?
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Old 11th February 2011, 09:51 AM   #8
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Quote:
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Would I need to put them in a box to get them measured?
One of the methods. No mics required.

The Subwoofer DIY Page - Measurements

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Old 11th February 2011, 09:51 AM   #9
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I Tested them after I Bought them and they can play down to 20Hz, but they are a little distorted. That's probably because of the amplifier I'm using though, Its a dodgy little DSE 20W surround amp. I'll test it with my Rotel RA-311 when(if) I get it working or I'll try them on dad's Rotel RA-1412 if he lets me
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Old 11th February 2011, 10:02 AM   #10
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Found This eBay listing for a Celestion Ditton 44 3 way crossover. The page says "This is a three way at 500 and 5000Hz third order at 18Db"
Would 5000Hz be okay to use or would I need to re-calculate it once I've put them in new boxes? And are there any differences between a Butterworth and a Bessel Crossover?
Thanks for your help
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