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-   -   Cheap Horns (http://www.diyaudio.com/forums/pa-systems/202693-cheap-horns.html)

sketchyphish 17th December 2011 05:35 PM

Cheap Horns
 
Hello peeps just wanted to find out if someone could give me some rough figures for Hornresp so that i can build my first HF Horn.

I have been slowly building up parts fro my system very cheap and have decided to start cheap and maybe one day il have the funding to build proper systems.
So anyway im Austria and well things aint easy here so i decided to buy a pair of KENFORD COMP-44 Compression drivers.

Now I cant find any TSP anywhere but i kinda guessed i wouldnt (CHEAP).
So what i really need is some parameters that will allow me to design the horn in hornresp.
I need it to go from 800hz and up, the reason is although the 12" mid i am using can go much higher, the TOA cabinets that i got real cheap too are already horn design, and im sure on simming it in hornresp that it will go to 800/1000hz if i make the throat a little smaller.

So anyways not too much just need somewhere to start.

Thanks

audiomik 17th December 2011 05:47 PM

From other users of this software, Hornresp isn't really suitable for simulating Horns much above 400/500Hz(?), as the parameters needed become too fine in variation to hold any real accuracy......
Mik

Top Shelf 23rd December 2011 04:20 PM

Try PM'ing JLH, I'm fairly certain he has done a lot of hornresp work on higher frequency horns. I've only designed mid horns up to 2khz, but I have WT2 so the T/S specs are accurate. If you have an SPL meter and a DMM I'm sure you could find the CD's resonance as a starting point for the lower cutoff of the horn, then perhaps chose a horn flare type then take your throat diameter and and the size of mouth you're aiming for and input these... see what comes up, and knock out a quick prototype. To see if the measured response is close to the modelled one.

AndrewT 23rd December 2011 04:55 PM

which JLH?
The Member here, or the late John L. Hood?

Top Shelf 23rd December 2011 05:01 PM

The member here, and oops try to keep the HP for the CD at least an 1-1 1/2 octave above the resonance :)

dangus 23rd December 2011 11:25 PM

You may be able to get used horns for next to nothing, or for the scrap value of the aluminium. The drivers and diaphragms in particular are the valuable bits. Try calling up local sound rental companies, speaker reconers, mobile discos.

Selenium horns are pretty cheap to buy new. The round horn(s) may sound good, if the theory about axisymmetric horns sounding less horn-like is true.

Too Tall 3rd January 2012 10:27 PM

Quote:

Originally Posted by dangus (Post 2832408)
You may be able to get used horns for next to nothing, or for the scrap value of the aluminium. The drivers and diaphragms in particular are the valuable bits. Try calling up local sound rental companies, speaker reconers, mobile discos.

Selenium horns are pretty cheap to buy new. The round horn(s) may sound good, if the theory about axisymmetric horns sounding less horn-like is true.

I have had great results with the "Round" also known as "Conical" horns.
The Yamaha Waveforce uses a large diameter conical horn that measures and performs great crossed over to a Eminence 15" woofer.
For a standard CD horn see if you can find a used DDS horn.

Horns are not the best place to cut cost. Keep a close eye on ebay on other places you can find used gear.

Too Tall 3rd January 2012 10:32 PM

Quote:

Originally Posted by Too Tall (Post 2845616)
I have had great results with the "Round" also known as "Conical" horns.
The Yamaha Waveforce uses a large diameter conical horn that measures and performs great crossed over to a Eminence 15" woofer.
For a standard CD horn see if you can find a used DDS horn.

Horns are not the best place to cut cost. Keep a close eye on ebay on other places you can find used gear.

I forgot to add something.

Beside DDS keep an eye on any old Community horns.
For as old as it is much of it is still useful. Much better then buying brand new P-Audio brand no matter how cheap it might be.

sketchyphish 12th January 2012 12:09 PM

TEST MODEL
 
Well ive designed a test horn and run some basic frquency sweeps and well it all seems to crop off after 10k. Now i have to calibrate my euipment then try again.

But upon designing the horn its responce did say it would drop off after this.
So i need to know some basic 1" CD parameters for a 80w driver (the one i have are Kenford com-44) anything close which will give me something to redesign a horn around.

And anything that will help raise the HF responce.

Otherwise i am considering putting my bullet tweters atop the cabinet and letting them run the 10k +

Too Tall 12th January 2012 04:42 PM

Quote:

Originally Posted by sketchyphish (Post 2858208)
Well ive designed a test horn and run some basic frquency sweeps and well it all seems to crop off after 10k. Now i have to calibrate my euipment then try again.

But upon designing the horn its responce did say it would drop off after this.
So i need to know some basic 1" CD parameters for a 80w driver (the one i have are Kenford com-44) anything close which will give me something to redesign a horn around.

And anything that will help raise the HF responce.

Otherwise i am considering putting my bullet tweters atop the cabinet and letting them run the 10k +

I have run into a hole in the response from 9KHz to 12kHz for most of the 1" throat horns.
As far as the driver output some continue to drop off and some have a spike upwards after that.
My thinking is it is a wavelength problem for around 10kHz and cannot be fixed.

For horn design, that is out of my league. I might copy a conical horn, but CD horns are too complex.
I can and do measure simple polar plots (Not full balloons) and on axis.
That is a long way from designing one.

What are you using this for?
Home audio or sound reinforcement?
If home audio I would look for another tweeter.


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