Proac response 3.8 crossover

it looks the same as this one

looks the same as this one...

http://audioclone.free.fr/proac 3.8.html

been thinking about trying this or the 2.5 after the new year. once winter set in.

can i ask where you got your page info? looks very close to the one i am posting here, but the art work is different. would like to see what else they may have to show.

have been looking for more info on the 3.8 but there doesn't seem to be much out there.

gary
 
TEK said:
Seems to be the design for scan-speak reference plus.
If so you could have a look at this;

An externally hosted image should be here but it was not working when we last tested it.


For more information go to this address.
http://www.audiocomponents.nl/speakers/scanspeak/scan-speak_eng.htm
You find the reference plus and all nessesary drawings down to the right.


regards, TEK

One thing to mention is that audiocomponents is using Intertechnik parts in his crossover, so Tritec, Torobar, KPSn are components of Intertechnik, you can find them on http://www.intertechnik.de
 
Re: Resistor

Richard Moon said:
47 ohm is too big.. So I guess it's 4.7 ohm..

But still big...

Just wanted to check..

If you are talking about L-pad resistor values, I think 47-ohm series with 22-ohm shunt should work.
If you mentioned that parallel resonant trap part, I have no specific reference. Usually a small ohmic value is used for very steep notch and greater value for smaller peak correction. I am not sure if you need that notch filter there at all?

BUT even if this crossover is not so weird perhaps, it’s an expensive one if you want to build this with polyprop capacitors and air-core inductors.

Argo
 
swede the site i posted above also has a lay out for the ccone and the cctwo. here is a link to the cctwo

http://audioclone.free.fr/cctwo.html

they also have what they call a 2.5 center. they link is as follows...

http://audioclone.free.fr/proac2.5center.JPG...

Hi, can anyone explain why they have another diagram of the speaker on this site which uses a different crossover and drivers?
Is this an alternative clone for the same speaker?


http://audioclone.free.fr/PROAC 2.5 SERIE.gif
 
Luke said:


Hi, can anyone explain why they have another diagram of the speaker on this site which uses a different crossover and drivers?
Is this an alternative clone for the same speaker?


http://audioclone.free.fr/PROAC 2.5 SERIE.gif

Hi Luke
As far as I can se, the filter drawing that you link to, is an alternative seriel filter, as the original Proac is parallel. The two filter technologies differs in many ways - also sonical i'm told. The drivers are the same as in the original 2.5. If you want to read more on seriel filters, thy 'googling' the web - I remember a guy named Tony Gee having a part on seriel crossovers on his website.

By the way - anybody have any news on the reverse engineering of the 3.8 ???

Cheers !


Hans Buhl Houmøller
 
With all due respect to the Audioclone website this is not an exact copy of the Proac 3.8, there are a number of differences:

Original uses Seas tweeter (maybe T25CF001/2?) not Scanspeak 9900.

Midrange driver is most likely the 18w/8545

However, the bass unit has to be the 18w/8535, same used in the 2.5 model. The 8545 does'nt have as good bass extension as a simple 8535 (45 designed for smaller enclosure volume). Proac seems to use the 8535 in all their new 3 way bass designs like Futures & Response 3.8, 5.