I am going to use a Fountek NeoPro5I which will be crosses over at 1,600hz 24/db. I do not know how to calculate the notch filter to reduce the two humps. one at around 4,200hz and one at around 9,500 hz.
The link for the data sheet is: <A HREF="http://www.fountek.net/products/neopro5i.pdf">http://www.fountek.net/products/neopro5i.pdf</A>
The programs I found on the net will give you a 3db reduction which is good for the 4,200hz hump but at the 9,500hz range I need about 5db down.
Any help would be greatly appreciated.
> not know how to calculate the notch filter
> to reduce the two humps. one at around
> 4,200hz and one at around 9,500 hz.
Well, the first one is just the character of the tweeter, it's a very gradual 2dB peak and drop. Frankly you could say that about the higher one, too. If you don't like a broad 4dB peak at around 10kHz, then don't use the tweeter. It'll sound quite sparkly. It's more the 3dB or more peaks at 2-5kHz that can make tweeters sound nasty.
OTOH, a 5dB peak IS a bit noticeable. What you want is a parallel trap circuit. I would start with 8 ohms, 0.1mH, 3uF, all in parallel, with that filter placed in series with the positive lead. But you need to listen/measure and tweak. And do it all in the box, because just that can change the response a lot.
Also, I would take a look at everybody else's xover for this tweeter that you might find on an internet search. See what they did.
Re: What humps?
Thanks for the input. I am new to crossover design and tweaking. Mainly I just connected some kind of 12db/octave crossover to my systems and equalized to my liking, which is another way of doing the same thing. I am just interested in eliminating one more component in my systems loop and am experimenting with crossovers. I was not successful in finding a crossover in use as of yet.
Thanks again and everyone keep up the good work with answering everyone’s questions that post here. Sometimes the questions seem quite ignorant but everyone has to start somewhere and I don't think I ever read an unkind response to a sincere question.
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