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In the Forum: Horn-Loaded Speakers
In the Thread: Adding one more spherical to Macondo.
Post Subject: I migh be the phase "clicking"....Posted by Romy the Cat on: 9/28/2007

 jessie.dazzle wrote:
I've been listening for about one week now with the filters set so the hand off from lower-mid to upper-mid happens higher up (upper-mid S2 is high-passed at 4800Hz instead of 3200Hz), meaning the small 400Hz horn is doing only the upper "half" of the mid range. I left the 180Hz horn as it was (790-3200Hz)….

I have not measured the output (too many other things to finish). I don't know exactly where the acoustic transition is happening, or if I am leaving a range uncovered. The point is, that the difference is such that I don't need to measure anything to be sure that this is better than when I had the upper-mid horn high-passed (electronically) lower down, at 3200Hz. I was most likely getting some overlap in the crossover region between the two horns (I don't attenuate the 180Hz "Fundamentals Channel", or any other channels).

So the 180Hz horn is currently handling two octaves (electronically), the 400Hz horn is also now handling only two octaves (electronically)... I like what I hear well enough to not ask these horns to do more than this. If measurement reveals an uncovered zone between the two, I would rather add another horn than to ask more of the existing horns...


The difference between 3200Hz and 4800Hz is practically negligible and I presume that if you do feel a huge difference then it is not because you introduced a 1600Hz gap between the channels. It is most likely that you changing the yours crossover to 4800Hz introduced a phase shift that accidentally “clicked” with the neighboring channels (I doubt that at this point, after changing the crossover, you moved and time re-align the drivers).  You might look at the differences in imaging since you changed the crossover. If you got some precision in imaging then it was phase not amplitude. The amplitude-wise I would not worry at this point too much. All those numbers of electrical crossovers are absolutely not important. What important is the response you get at your listening position – it will be way out there anyhow… You will get RTA in the end and will figure out… BTW, do not forget the doing what you did moved the center radiation point of your installation slightly upper.

The Cat

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