X-Over arrangement?

[jaycool1995]

Hi,
I was just curious if there was a set arrangement of how you organize the h/l pass filter, l-pad, notch filter, impedance normalization etc in a x-over. Haven't been able to find anything on it yet.
Thanks

[Æ]

Hi,
I was just curious if there was a set arrangement of how you organize the h/l pass filter, l-pad, notch filter, impedance normalization etc in a x-over. Haven't been able to find anything on it yet.
Thanks

I always follow the schematics. If you have a finished schematic it can serve as your blueprint.

[jaycool1995]

Yeah i would, but i am at the designing stage (i have no schematics) of the x-over and am unsure of what to put where
Thanks

[Æ]

Yeah i would, but i am at the designing stage (i have no schematics) of the x-over and am unsure of what to put where
Thanks

Look at what other people have built. Wolf posts a lot of pictures.
Get a book or two. Ray Alden's "Advanced Speaker Systems" and "Speaker Building 201" are good for beginners.

[Chris Roemer]

Look at what other people have built. Wolf posts a lot of pictures.
Get a book or two. Ray Alden's "Advanced Speaker Systems" and "Speaker Building 201" are good for beginners.

Most often an L-pad and/or Zobel reside next to the driver(s). If a simple series resistor is being used to attenuate a mid/tweeter (rather than an L-pad), more often than not it will be at the beginning ("amp side"), although it can be near the driver, in the center of the XO, OR even split between 2 different places. These varios ways of attenuating can "tilt" a tweeter's response up or down, or keep it relatively "flat". A "notch" can be implemented in several different ways in several different locations.

As for a 2nd or 3rd order HP/LP (or BOTH in a BP), you can't change their order in the circuit and still maintain the desired effect. In a BAND PASS, however; the LP/HP sections can be flopped fore or aft, and even intermingled with each other (this is actually the most common). Given a bandpass made from identical HP/LP sections, moving the components around (before/after each other) will modify the filter's transfer function. The positioning of all these elements gets worked out in the modelling software.

Chris

[joekraska]

Hi,
I was just curious if there was a set arrangement of how you organize the h/l pass filter, l-pad, notch filter, impedance normalization etc in a x-over. Haven't been able to find anything on it yet.
Thanks

Follow the link in my sig? LPAD's and notches aren't hidden down there. The LPAD is pretty easy, the notch a little more complicated. An LPAD is really just a resister inline to the speaker, however usually you want to make the total impedance remain the same, so you create a parallel resister to the speaker also. I'll not try to explain a notch, as I am learning just like you are, and can't yet. :-)

Joe.

[Face]

Do you mean this: http://www.troelsgravesen.dk/coils.htm

[jaycool1995]

@face
I think more like, the order in which to put the parts of the crossover in (e.g hp, LPAD, Zobel etc); but great link, very interesting
Thanks

[Paul Carmody]

In Jeff Bagby's Passive Crossover Designer, he has a large diagram of a generic crossover with pretty much every part installed. It corresponds to the "spinners" in his program. It gives the order of parts in the most logical, textbook manner. Speaking of which, do you own any speaker design textbooks?