original crossover schematics for clone ATC SCM 100

scalero · 9th May 2008, 11:28 AM

Anybody has the original crossover schematics for ATC SCM 100 or 50?
I know they have impedance correction "up and down" and 12 db slopes "up and down in the 150s, but nothing about tweeter or bass.
Only know the croosover points 380, 3500.

fabro · 2nd December 2008, 01:50 AM

i would like to see the original schematics too

but i didn't find them till now...

tamariska · 21st December 2008, 04:49 AM

I have got the XO from internet but I can't remember the site.

fabro · 21st December 2008, 04:13 PM

thank you very much!

!!!!!

if you will remeber the site please let us know

tnxxx

scalero · 24th December 2008, 03:11 PM

In this crossover, Is the vifa or seas Tweeter?

scalero · 24th December 2008, 03:12 PM

I meat the vifa mod.

TwangBar · 29th December 2008, 11:16 PM

Thanks for posting the xover. Would you happen to know if the mid is the 16 or 8 ohm version? I have an old pair of Proac Studio Towers which was their SCM50 take off - and they used the 16 ohm version of the mid.

Thanks.

Taco · 30th December 2008, 06:53 AM

Quote:

Originally posted by TwangBar
Thanks for posting the xover. Would you happen to know if the mid is the 16 or 8 ohm version? I have an old pair of Proac Studio Towers which was their SCM50 take off - and they used the 16 ohm version of the mid.

Thanks.

Given the values of the components in the zobel and for the series inductor I would guess that it is the 8 Ohm version of the mid.

TwangBar · 1st January 2009, 11:06 PM

For interest and comparison sakes, I am attaching the xover for the Proac Studio tower. This was an EBS design that was the precursor to the Response 4.

tamariska · 7th January 2009, 10:00 PM

To my understanding the scm50 uses 8 ohm mid sm75 (s version). They are very expensive. Other than sensitivity, both are very high quality, have the same midrange purity and details. Very pleasing to ears.

I have had a pair of brand new 16 ohm of ( non s version of sm75-150 ). I wish to clone scm50 passive xo with different woofer & tweeter.

After being provoked reading the following old thread:

Comparison of Volt B2500.1, B250.8, RV3143 and S/S 25W8565-01

i tempted to go with b2500. With massive magnets they look very high quality at least on par with sb75 or maybe better. Report mentioned it has well integrated with sm75 with slamm bass and very relealing on bad recording.

For tweeter i will use the famous ss revelator r2904/7000 because they are avalable in local shop, very expensive but still in a favourable with their discounted pricing.

I use lspcad for designing the xo (3 way passive).

9th May 2008, 11:28 AM	#1
scalero diyAudio Member Join Date: Oct 2004	original crossover schematics for clone ATC SCM 100 Anybody has the original crossover schematics for ATC SCM 100 or 50? I know they have impedance correction "up and down" and 12 db slopes "up and down in the 150s, but nothing about tweeter or bass. Only know the croosover points 380, 3500.

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2nd December 2008, 01:50 AM	#2
fabro diyAudio Member Join Date: Dec 2006	i would like to see the original schematics too but i didn't find them till now...

21st December 2008, 04:13 PM	#4
fabro diyAudio Member Join Date: Dec 2006	thank you very much! !!!!! if you will remeber the site please let us know tnxxx

24th December 2008, 03:11 PM	#5
scalero diyAudio Member Join Date: Oct 2004	In this crossover, Is the vifa or seas Tweeter?

24th December 2008, 03:12 PM	#6
scalero diyAudio Member Join Date: Oct 2004	I meat the vifa mod.

29th December 2008, 11:16 PM	#7
TwangBar diyAudio Member Join Date: Jan 2003 Location: Ottawa, Canada	Thanks for posting the xover. Would you happen to know if the mid is the 16 or 8 ohm version? I have an old pair of Proac Studio Towers which was their SCM50 take off - and they used the 16 ohm version of the mid. Thanks.

7th January 2009, 10:00 PM	#10
tamariska diyAudio Member Join Date: Oct 2008	To my understanding the scm50 uses 8 ohm mid sm75 (s version). They are very expensive. Other than sensitivity, both are very high quality, have the same midrange purity and details. Very pleasing to ears. I have had a pair of brand new 16 ohm of ( non s version of sm75-150 ). I wish to clone scm50 passive xo with different woofer & tweeter. After being provoked reading the following old thread: Comparison of Volt B2500.1, B250.8, RV3143 and S/S 25W8565-01 i tempted to go with b2500. With massive magnets they look very high quality at least on par with sb75 or maybe better. Report mentioned it has well integrated with sm75 with slamm bass and very relealing on bad recording. For tweeter i will use the famous ss revelator r2904/7000 because they are avalable in local shop, very expensive but still in a favourable with their discounted pricing. I use lspcad for designing the xo (3 way passive).