Need help with 2 way crossover design

Needadispenserhere · 9th February 2011, 09:53 AM

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?

Needadispenserhere · 11th February 2011, 04:58 AM

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?

Francec · 11th February 2011, 07:41 AM

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

Needadispenserhere · 11th February 2011, 09:24 AM

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

And here's mine

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.

planet10 · 11th February 2011, 09:34 AM

Quote:

Originally Posted by Needadispenserhere

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

Needadispenserhere · 11th February 2011, 09:40 AM

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?

bobodioulasso · 11th February 2011, 09:44 AM

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?

planet10 · 11th February 2011, 09:51 AM

Quote:

Originally Posted by Needadispenserhere

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

dave

Needadispenserhere · 11th February 2011, 09:51 AM

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

Needadispenserhere · 11th February 2011, 10:02 AM

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

9th February 2011, 09:53 AM	#1
Needadispenserhere diyAudio Member Join Date: Feb 2011 Location: Victoria, Australia	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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11th February 2011, 04:58 AM	#2
Needadispenserhere diyAudio Member Join Date: Feb 2011 Location: Victoria, Australia	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?

11th February 2011, 07:41 AM	#3
Francec Banned Join Date: Jul 2006 Location: Port Melbourne, Australia	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

11th February 2011, 09:24 AM	#4
Needadispenserhere diyAudio Member Join Date: Feb 2011 Location: Victoria, Australia	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 And here's mine 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.

11th February 2011, 09:40 AM	#6
Needadispenserhere diyAudio Member Join Date: Feb 2011 Location: Victoria, Australia	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?

11th February 2011, 09:44 AM	#7
bobodioulasso diyAudio Member Join Date: May 2008	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?

11th February 2011, 09:51 AM	#9
Needadispenserhere diyAudio Member Join Date: Feb 2011 Location: Victoria, Australia	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

11th February 2011, 10:02 AM	#10
Needadispenserhere diyAudio Member Join Date: Feb 2011 Location: Victoria, Australia	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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