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In the Forum: Horn-Loaded Speakers
In the Thread: Jessie Dazzle Project
Post Subject: Where to stop lower MFPosted by jessie.dazzle on: 7/7/2008
Romy, thanks for your thoughts,

Quotes from Romy in blue :

"...I personally do not feel that you use Fundamentals Channel properly. You desired to run your Fundamentals Channel up to 3200Hz but it is too high..."

Maybe, probably, yes, OK, I am guilty of allowing myself to be seduced by something in the sound of this horn, and have been reluctant to limit its output.

I would like to ignore the issue of altitude, and concentrate only on identifying the frequency range to which each horn is best suited, and to use each horn accordingly... Once that is done, I have no problem building a platform, digging a trench, moving, changing girlfriends, etc.

"...Take a look, you have your MF channel I presumed crossed at 3200Hz with 3uF cap, at least it is what I have. (yes, 3.3uF) However it is juts electrical crossover point. Do not forget that the secondary resonance of S2 driver pushes a large boost at 1250Hz making the S2 to response flat down to 1000Hz..."

I did not forget, I've seen that it runs well below the electrical cutoff; I've written recently (in a response to Klaus I think) that I now need to measure what each horn is really doing. This weekend I took a very quick look at output with an RTA. I am coming into a phase where I will be doing a lot more of this.

"...Also, the HF extension from Fundamentals Channel crates some lobbing problem in regards to MF channel. So, what you need to do is to found a right balance between the Fundamentals Channel and MF Channel..."

I wish I understood more about this... Need to read more.
"...In my view the Fundamentals Channel should not push recognizable Sound but rather the unpleasant boom noise. Portend a hypothetic guitar. The sounds of strings shell come from MF channel. The sound of guitar’s deck shall come from Fundamentals Channel. The sound of the room where the guitar plays shell come from the Upperbass Channel.  In your case I feel the Fundamentals Channel work too high..."

Interesting way to see it. Again, after hearing the horn, I was inclined to let it have a larger roll in reproducing the frequency range.

"...Do the following – put two channels ONLY in operation: the MF and Fundamentals Channel. Run the RTA with MF channel and found out where the MF will roll off. Set the Fundamentals Channel at the very same point and listen both of the channels, running the low-pass crossover point on the Fundamentals Channel you will soon or later found the one you feel is right. I ma conversed that it will be lower then what you have now..."

I have been intending to do exactly this... I would not be surprised to find that you are correct (it would not be the first time!), but I will remain objective. I also want to try listening with the crossover point of the upper MF horn moved up a bit; yes I've been through this before, but never with so much of the project done and in place.

jd*

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