i need and GOOD active XO

[oaktsh]

HPotter,
How could one get a hold of the schematic for the xover you are referring to. I have not seen or heard of them. Pictures would also be great. thanks.

[Peter Daniel]

Here it is. Used to be really good crossover, probably still is.

[audionut]

In my bi amped system, I am going to put a passive L/C filter in front of a BOSOZ...whats wrong with that idea?

[Apogee]

What is the note referring to the * cutoff at the top of the page?

Also, what does the line above the word "stage" say?

Finally, do you have any other info that goes with this unit/schematic (adjustment procedure/specs, voltages, etc)?

Thx,

Steve

[Peter Daniel]

8 resistors with * are in a plug in module. Caps values in ( ) are for frequency x10. The numbers beside op amps in triangles are for offset adjustment sequence. Voltage is +/-15V. THD is .01%, slopes 18dbs, inp imp 20k, output 1k5 ohms.
Resistors values for 90Hz are 39k ohm, for 160Hz - 22k ohm, for 904Hz - 3k9 ohm. I guess from that you can calculate any other frequency. All 8 resistors have the same value.

[Dan Mattis]

I purchased a Behringer CX3400 stereo 3-way crossover from www.zzounds.com for $149. It is a 24db/octave Linkwitz/Rilex design. A friend also has purchased the same crossover and is very happy with it. They also have the Behringer CX2310 with is the 2-way version for $99

[cocolino]

Up to now I read several opinions in this thread about about all kinds of filter topolgy and their properties and which one to choose for best results: 6dB, 24dB, 48dB, sums to perfect phase, substraction or not substraction etc., etc.

Sorry, but discussing this without the particular speaker in use is meaningless.

The electrical property or the topology of the filter itself does not matter.
What counts is what comes out of the speakers.
Wether good results are obtained regarding the final ouput is not a question how perfect the filter works by itself but how perfect the filter works in COMBINATION with the speaker.
So, the question which kind of filter to choose, be it 6dB or 48dB, Butterworth or Linkwitz, active/ passive or whatever depends in first regards of the particular behaving of the speaker and is not a fundamental solution fitting for all kind of speaker/crossover combinations.

There is no "good crossover" and therefore cannot be designed by itself. There is only good crossover/speaker combination.

[Bill Fitzpatrick]

Check:

http://kbacoustics.com/ygbsm/intro/index.html

Giving myself a plug, thank you very much.

[CHRIS8]

Cocolino:

I'm afraid your logical advice is in vain. In this thread, they are too busy discussing subjective colorations of the circuits. Even the mention of opamps in the signal path are taboo to some people here. Non linear and IM distortion is apparantly desireable, over an adequate slope to some even since it avoids that use of a 'nasty' active cascaced filter. LMAO.

Good luck convincing them to be rational.

-Chris

-Admitted user of a cascaded op-amp filter on Focal mids - And Proud of It!-

[Keithj]

Originally posted by cocolino

Sorry, but discussing this without the particular speaker in use is meaningless.

There is no "good crossover" and therefore cannot be designed by itself. There is only good crossover/speaker combination.

Yahoo! About time this came out. Look at it this way, all you're doing with an active crossover is moving it... from attachment directly to the loudspeakers to between a preamp and a power amp. What this means is that it must be designed IN CONJUNCTION WITH THE LOUDSPEAKER just as you would a passive crossover.

Linkwitz has lots of lovely information on his web site about this and all the bits and bobs that are needed. Try www.linkwitzlab.com

He even has facsimiles of his Wireless World articles that discuss all this in the 1980s.

I gotta drop this in here... There ain't nuthin' new under the sun.

regards, Keith