Proac Response 4 X-overs

Jorgitox · 30th December 2008, 10:42 PM

I finally got the drivers and wood enough to make this dream come true, but the most important is still lacking. Does anybody got serious info about their crossover schemes?

Thanks in advance,

Jgtx.

P.s.: I am looking for another set of 2 x ATC SM75-150 (8 Ohms.). If you got something in good shape, please let me know.

Jorgitox · 2nd January 2009, 05:07 PM

Any idea?

TwangBar · 2nd January 2009, 05:58 PM

I found this a while back.... missing some numbers though... somewhere to start...

TwangBar · 2nd January 2009, 05:59 PM

Forgot to mention also that Proac always used the 16 ohm version of the mid... even in the Studio Tower and EBS versions.

Jorgitox · 2nd January 2009, 06:09 PM

Quote:

Originally posted by TwangBar
Forgot to mention also that Proac always used the 16 ohm version of the mid... even in the Studio Tower and EBS versions.

Thanks! I suppose then that my E.B.S. got mid's working in 16Ohms, instead at the back side of the speakers appear 8 Ohms. Parallel way, maybe?

Regards and thanks again!

TwangBar · 2nd January 2009, 06:19 PM

Jgtx: If you have the Proac EBS, they would be the 16 ohm version mids. The back of the speaker rating is for the whole system - with all drivers in the xover.

See the following thread (I added the Studio Tower xover there - which should be the same as you EBS):

original crossover schematics for clone ATC SCM 100

tamariska · 7th January 2009, 10:00 PM

I got the following xo design from proac. No information whether was 16 ohm version of sm75-150 midrange.

Is this proac studio 3 speaker?

Jorgitox · 7th January 2009, 10:08 PM

Quote:

Originally posted by tamariska
I got the following xo design from proac. No information whether was 16 ohm version of sm75-150 midrange.

Is this proac studio 3 speaker?

This is the x-over of the E.B.S. model (the same speakers I got at home). 16Ohms in this case.

Regards,
Jgtx.

Cousin Billy · 10th January 2009, 11:58 AM

It's time for me to become obnoxious.

13 years ago I went looking for a great pair of speakers. I was a travelling salesman, so I got to visit almost every highend stereo store in Canada, and the northern States. When I say I listened to hundreds of speakers, I would not be stretching the truth.

Near the end of my journey I heard the first speaker which finally had me say 'Yah, this sounds right, I have goosebumps', it was the ProAc Response 2. How could this little bookshelf speaker make me smile?. The saleman didn't even ask me if I wanted to buy, he asked me if I wanted the broken in demo, or a new pair, same price. He explained that most serious lookers, once hearing these little beauties, bought.

Some years later I started tinkering, first was the crossover. When I took out the original, and did a careful drawing of it, I was amazed that the + ve run went straight to the woofer, with the tweeter out of phase, - ve run straight to the tweeter. Now when I look at the drawings submitted to you, it shows the same thing, + ve runs straight to the drivers.

Do not discount this fact. When building your speakers, listen with this orientation first, then switch the runs to the opposite side, do not go with what sounds better, go with what sounds natural. Too many people believe the + ve side gets all the crossover stuff, phooey I say, phooey. ProAc (Mr. Tyler) have built, and sold, way too many speakers to way too many happy customers, to be wrong.

The simplicity of his crossovers puts a smile on my face.

Al.M · 1st March 2009, 01:09 PM

Hi Billy

We kind of discovered the crossover secrets in this website about 6-7 years ago if you are'nt already aware:

http://www.geocities.com/diyproac25/comments.htm

Al.M

30th December 2008, 10:42 PM	#1
Jorgitox diyAudio Member Join Date: Sep 2006	Proac Response 4 X-overs I finally got the drivers and wood enough to make this dream come true, but the most important is still lacking. Does anybody got serious info about their crossover schemes? Thanks in advance, Jgtx. P.s.: I am looking for another set of 2 x ATC SM75-150 (8 Ohms.). If you got something in good shape, please let me know.

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2nd January 2009, 05:07 PM	#2
Jorgitox diyAudio Member Join Date: Sep 2006	Any idea?

2nd January 2009, 05:59 PM	#4
TwangBar diyAudio Member Join Date: Jan 2003 Location: Ottawa, Canada	Forgot to mention also that Proac always used the 16 ohm version of the mid... even in the Studio Tower and EBS versions.

2nd January 2009, 06:19 PM	#6
TwangBar diyAudio Member Join Date: Jan 2003 Location: Ottawa, Canada	Jgtx: If you have the Proac EBS, they would be the 16 ohm version mids. The back of the speaker rating is for the whole system - with all drivers in the xover. See the following thread (I added the Studio Tower xover there - which should be the same as you EBS): original crossover schematics for clone ATC SCM 100

10th January 2009, 11:58 AM	#9
Cousin Billy diyAudio Member Join Date: Nov 2008	It's time for me to become obnoxious. 13 years ago I went looking for a great pair of speakers. I was a travelling salesman, so I got to visit almost every highend stereo store in Canada, and the northern States. When I say I listened to hundreds of speakers, I would not be stretching the truth. Near the end of my journey I heard the first speaker which finally had me say 'Yah, this sounds right, I have goosebumps', it was the ProAc Response 2. How could this little bookshelf speaker make me smile?. The saleman didn't even ask me if I wanted to buy, he asked me if I wanted the broken in demo, or a new pair, same price. He explained that most serious lookers, once hearing these little beauties, bought. Some years later I started tinkering, first was the crossover. When I took out the original, and did a careful drawing of it, I was amazed that the + ve run went straight to the woofer, with the tweeter out of phase, - ve run straight to the tweeter. Now when I look at the drawings submitted to you, it shows the same thing, + ve runs straight to the drivers. Do not discount this fact. When building your speakers, listen with this orientation first, then switch the runs to the opposite side, do not go with what sounds better, go with what sounds natural. Too many people believe the + ve side gets all the crossover stuff, phooey I say, phooey. ProAc (Mr. Tyler) have built, and sold, way too many speakers to way too many happy customers, to be wrong. The simplicity of his crossovers puts a smile on my face.

1st March 2009, 01:09 PM	#10
Al.M diyAudio Member Join Date: Jul 2001 Location: Australia	Hi Billy We kind of discovered the crossover secrets in this website about 6-7 years ago if you are'nt already aware: http://www.geocities.com/diyproac25/comments.htm Al.M

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