ATC SCM 20 sl ?

[Mikegr]

Hello,
I try to biuld a clone of ATC SCM20 sl but i dont have some information that i need.
I have the midwoofer unit and the tweeters (.. the latest version by Seas Excel).
I need the cabinet schematics and crossover schematics.
If anybody know something please advice.
Thank you in advance.

[lbstyling]

atc make there own drivers and use a awsome mid-dome thats made in house- i beleve a atc clone would cost the same knod of money that atc would charge for the original.

a seas derived speakers wouldnt sound the same.

[Mikegr]

Thank you for your reply lbstyling.
I have the original ATC mid/woofer drivers and the Seas tweeter,also i find the crossover schematics.
If you cant provide me some cabinet schematics i really appreciate it .
Actually i want to moove from Atc 12 to the 20 sl...did you think is worth ..?

Thanks again.

[ralphs99]

Hi Mike,

Have a look at this page:
http://www.mhennessy1.f9.co.uk/atc/index.htm

Cheers, Ralph

[Mikegr]

Originally Posted by ralphs99

Hi Mike,

Have a look at this page:
http://www.mhennessy1.f9.co.uk/atc/index.htm

Cheers, Ralph

I allready know this page,it was my source for the crossover schematics but no cabintes building informations....
Any way thanks ralphs99

[J.R.Freeman]

Originally Posted by Mikegr

I allready know this page,it was my source for the crossover schematics but no cabintes building informations....
Any way thanks ralphs99

Hi Mike,

Well, you have the drive units, and the cross-over schematic, and you know that the enclosure is supposed to be 20L in volume (as taken from that site referenced above). The last bit of trouble is in the question: is it sealed or ported? I'm not sure. But if it is sealed, you could approximate the front baffle dimensions based on the pictures given in that website. Print up a nice picture of the front baffle layout, then measure the dimensions of the driver cut-out. Compare that with the dimensions of your real driver, and you will have a ratio describing the scale of that picture. You can then use the dimensions of the picture (and then apply your calculated ratio) to determine fairly accurately the dimensions of the real-world front baffle. This is likely the most critical set of dimensions, as it will dictate diffraction performance, and dispersion - things likely matched to your crossover.

After that, you have the length and width of the front baffle, and therefor you can calculate depth as you know your volume needs to be 20L.

I think you are almost set to make your clone! Where did you get your bass driver, if I might ask?

Jim



edit: update, I just found in that site that these are in fact sealed enclosures. You are ready to go!

[Mikegr]

Originally Posted by J.R.Freeman

Hi Mike,

Well, you have the drive units, and the cross-over schematic, and you know that the enclosure is supposed to be 20L in volume (as taken from that site referenced above). The last bit of trouble is in the question: is it sealed or ported? I'm not sure. But if it is sealed, you could approximate the front baffle dimensions based on the pictures given in that website. Print up a nice picture of the front baffle layout, then measure the dimensions of the driver cut-out. Compare that with the dimensions of your real driver, and you will have a ratio describing the scale of that picture. You can then use the dimensions of the picture (and then apply your calculated ratio) to determine fairly accurately the dimensions of the real-world front baffle. This is likely the most critical set of dimensions, as it will dictate diffraction performance, and dispersion - things likely matched to your crossover.

After that, you have the length and width of the front baffle, and therefor you can calculate depth as you know your volume needs to be 20L.

I think you are almost set to make your clone! Where did you get your bass driver, if I might ask?

Jim



edit: update, I just found in that site that these are in fact sealed enclosures. You are ready to go!

Hi Freeman,
This is a really a nice way to find out the front baffle real worls dimensions.
I found the mid/woofer units form a unwabnted Atc scm 12...is the same with the 20"s...
Thank you for your help.
Regards.

[Mikegr]

Hi Freeman,
Thank you for the suggestion about the front baffle measurment,really nice.
I found the midwoofer units from a unwanted Atc scm 12....
Thank you for your help.
Regards.

[J.R.Freeman]

My pleasure!

That's a nice little speaker - I've been looking for some DIY studio monitors for a while, I don't if I should try to find some of my own. I can see why you like them. Let us know how your build goes, I'd love to see some pictures!

Jim

[bricoleur]

i'm late
i saw this:19*12*16.5
i speak a better french than english so..