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 Post subject: Re: CNC Speaker Design
PostPosted: December 15th, 2017, 9:04 pm 
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Joined: October 21st, 2013, 6:53 pm
Posts: 226
brombo wrote:
You might see if there is any software that can simulate your horn -

http://educypedia.karadimov.info/electr ... peaker.htm


Thanks Brombo!

So I prugged in as much information as I could understand into HORNRESP, but it was only minimumly informative.

The only thing it really told me is that the horn will fall off relatively steeply below 80 cycles, but may possibly reach above 1000. And that most of the acuostical impedance will occur between 100 and 200 cycles.

I was already in possession of this information though, just based on the length of the horn, and a little intuition.

What it didn't tell me, which Sashi eluded to, is the distortion that might be generated by the Driver/Throat Compression ratio, ( which I have now changed from 7:1 to about 3.5:1).


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 Post subject: Re: CNC Speaker Design
PostPosted: December 15th, 2017, 9:11 pm 
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Joined: October 21st, 2013, 6:53 pm
Posts: 226
On another note:

I modeled my 15" version of this horn on Hornresp, and It will make it down to almost to 50 cycles, which is perfectly acceptable to me, however the cone displacement graph for both horns shows an enormous amount of movement below 80Hz for the small horn, and 50 Hz for the big horn.

Is this in any way useable energy, or would I want to place a High Pass Filter on both, in practice, to increase my power handling?

Chris


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 Post subject: Re: CNC Speaker Design
PostPosted: December 15th, 2017, 10:20 pm 
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Joined: July 17th, 2016, 6:24 am
Posts: 375
chris1973 wrote:
brombo wrote:
You might see if there is any software that can simulate your horn -

http://educypedia.karadimov.info/electr ... peaker.htm


Thanks Brombo!

So I prugged in as much information as I could understand into HORNRESP, but it was only minimumly informative.

The only thing it really told me is that the horn will fall off relatively steeply below 80 cycles, but may possibly reach above 1000. And that most of the acuostical impedance will occur between 100 and 200 cycles.

I was already in possession of this information though, just based on the length of the horn, and a little intuition.

What it didn't tell me, which Sashi eluded to, is the distortion that might be generated by the Driver/Throat Compression ratio, ( which I have now changed from 7:1 to about 3.5:1).


The horn length is less than 50", it will not play freqs below 70Hz. What is the goal here in terms of frequency response?

The tapped horn sub I am planning to build is about 8' tall and goes down to 20Hz. Plan to cross it over at 80Hz.

_________________
Shashi


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 Post subject: Re: CNC Speaker Design
PostPosted: December 16th, 2017, 5:28 pm 
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Joined: October 21st, 2013, 6:53 pm
Posts: 226
For the 10" horn to prove itself, it only needs to get to 70-80Hz, but it does need to extend over 1000Hz.

For the 15" horn, for which I haven't posted a design, if it gets to 50-60Hz, and makes it to 1000Hz, I think it's a success.

This is not a HiFi experiment. If I build any of these horns, I want to test them, and eventually place them in the hands of a local band.


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