Catching up...crossover and speaker designs...

**amandarae** · April 16th, 2015, 01:04 AM

Hi AA,
What kind of Xo are these? I tried to plug in the values for Linkwitz, Butterworth, or Bessel but they are way off. Is it a 3rd Order/4th order "by ear'"thing or there's actually an a formula to follow? Also, is the cutoff for both at 1200 or 1300 or the LP has different cutoff than the HP? Apologies for all the questions, I am planning on building it and experiement using my 604-8G's. Thanks much!

Abe

GM · April 16th, 2015, 01:40 AM

FWIW, when mating compression horns to point source drivers, the various filter theories are at best only good for getting in the ballpark; the rest either requires good hearing [ideally with perfect pitch] and/or a good measurement system.

GM

**amandarae** · April 16th, 2015, 04:53 PM

Thanks GM for the reply!

Originally Posted by GM

FWIW, when mating compression horns to point source drivers, the various filter theories are at best only good for getting in the ballpark; the rest either requires good hearing [ideally with perfect pitch] and/or a good measurement system.

GM

**analog addict** · December 17th, 2015, 11:26 AM

Originally Posted by amandarae

Hi AA,
What kind of Xo are these? I tried to plug in the values for Linkwitz, Butterworth, or Bessel but they are way off. Is it a 3rd Order/4th order "by ear'"thing or there's actually an a formula to follow? Also, is the cutoff for both at 1200 or 1300 or the LP has different cutoff than the HP? Apologies for all the questions, I am planning on building it and experiement using my 604-8G's. Thanks much!

Abe

Abe,

Sorry for the late reply. This thread dropped off my radar. Anyway, It is a combo of different orders, 3rd/4th, see the markings on the diagram. Dennis designs with a known starting point, and then modifies by ear. He is one of those designers with a known "golden ear", so he listens, snips here, solders there, adds a component, and then magic happens. Hard to believe unless you see him do it...

**amandarae** · December 24th, 2015, 07:22 PM

Ok Thanks!

Happy Holidays!
Abe

**rogerh113** · September 23rd, 2016, 10:35 AM

I enjoyed reading about your ob project. I just got some 604 8g drivers and am considering open baffle. Do you happen to have dimensions / plans for your open baffle design? Are you still using / enjoying them? My drivers are not the UREI version, so I am not sure that the crossover design would be applicable.

thanks -- Roger

**LowOhms** · September 24th, 2016, 06:51 PM

Originally Posted by analog addict

Abe,

Sorry for the late reply. This thread dropped off my radar. Anyway, It is a combo of different orders, 3rd/4th, see the markings on the diagram. Dennis designs with a known starting point, and then modifies by ear. He is one of those designers with a known "golden ear", so he listens, snips here, solders there, adds a component, and then magic happens. Hard to believe unless you see him do it...

Hello,

While I appreciate your enthusiasm for the subject matter, I want to point out in your post #1, third photo : the wiring of that crossover can be, and needs to be greatly improved. It has various losses - which one should consciously design OUT, and avoid.

Can you spot them? Here is what I see that can be bettered :

The crossover's wiring, in general, is too thin, and as such, it exhibits poor transfer function.

Also, the leads on almost all the film caps' bodies are inadequate for optimum energy transfer, when such (film) caps are used in speaker duty.

The implementation as was shown, could be re-thought and re-done . I liked your post in general, but HOW can we move the audio art up a notch or two. ??

Jeff Medwin Low Ohms