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Old 3rd April 2013, 12:40 PM   #3251
Jmmlc is offline Jmmlc  France
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Quote:
Originally Posted by Sabbelbacke View Post
David is old enough to speak for himself, but didn't he clearly say that he doesn't want to include filtering in hornresp? I think we should respect that.

Or did I miss something and did David open the door to implementing filters ?
Hello Sabbelbacke,

My message was intended to propose to David if needed, my help to integrate such filters in a same way David and me used to collaborate to introduce the "Impulse Response" module and the "Spectrogram" module, that surely many like to see now in Hornresp.

Best regards from Paris, France

Jean-Michel Le Clac'h
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Old 3rd April 2013, 12:42 PM   #3252
Mark Kravchenko --- www.kravchenko-audio.com
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As a little fly on the wall listening...
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Old 3rd April 2013, 01:08 PM   #3253
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Dont get me wrong, Id love filters in hornresp, too I just got the impression that people ask a lot about something where david said "no" already.

I also know that once you start to put passive filters in hornresp, there is no "this is enough"...

If hornresp were to get filter capability, Id strongly recommend to implement something like in BoxSim, so ALL possibilities are there (important impedance corrections, notches, etc..). Maybe the Boxsim guys want to share their work?
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Old 3rd April 2013, 01:41 PM   #3254
tb46 is offline tb46  United States
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Default Post #3242

Hi David,

Thanks for reinstating the horn throat sound pressure and throat particle velocity charts, and the other changes. This is very much appreciated.

Regards,
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Old 4th April 2013, 09:09 AM   #3255
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Originally Posted by Jmmlc View Post
About introducing filters in Hornresp at least we should discuss about some requirements and priorities.
Hi Everyone,

With regard to Jean-Michel's comment, would it be sufficient to be able to specify a passive filter in accordance with the attached network template, with only those components actually required being included?

If so, then a real time 'Filter Wizard' could be quite a nice thing to have... :-).

R = resistor, C =capacitor, L = inductor.

Kind regards,

David
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File Type: png Filter.png (5.2 KB, 100 views)
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Old 4th April 2013, 09:11 AM   #3256
AndrewT is offline AndrewT  Scotland
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Passive filtering between the drive emf and the speaker driver.

Or

Active filtering before the drive amplifier, leaving the drive emf to speaker driver link uncontaminated.
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Old 4th April 2013, 09:22 AM   #3257
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Quote:
Originally Posted by Jmmlc View Post
My message was intended to propose to David if needed, my help to integrate such filters in a same way David and me used to collaborate to introduce the "Impulse Response" module and the "Spectrogram" module, that surely many like to see now in Hornresp.
Hi Jean-Michel,

Thanks for your kind offer, but I should be okay. The circumstances are a bit different this time - I better understand the underlying theory :-).

Kind regards,

David
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Old 4th April 2013, 09:26 AM   #3258
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Quote:
Originally Posted by tb46 View Post
Thanks for reinstating the horn throat sound pressure and throat particle velocity charts, and the other changes. This is very much appreciated.
Hi Oliver,

You're welcome. As you can see, I took note of your comments :-).

Kind regards,

David
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Old 4th April 2013, 09:57 AM   #3259
Jmmlc is offline Jmmlc  France
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Quote:
Originally Posted by David McBean View Post
Hi Everyone,


If so, then a real time 'Filter Wizard' could be quite a nice thing to have... :-).

R = resistor, C =capacitor, L = inductor.
Hello David,

If we limit the choice to a high pass filter, with a few more components than in your schematics we can also provide impedance equalization and HF uplifting.

(I put 2 RLC impedance equalizors but one could eventually be enough, even if with horns there is often more than 2 peaks of impedance).

Best regards from Paris, France


Jean-Michel Le Clac'h
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File Type: png filter_2.png (8.7 KB, 99 views)
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Old 4th April 2013, 11:01 AM   #3260
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I love the filtering in Boxsim, it looks like this:
Click the image to open in full size.
It is possible to put in whatever one wants, no limits. I could ask Uwe, the author, if he would share his modul of the function...
Another idea in the same direction would be to take some parts of SPICE and integrate them.
SPICE - Wikipedia, the free encyclopedia

Either way, both active and passive filtering are interessting, if Ih had to choce, Id take the passive one (after all, aktive Filtering is "boring" in this regard, since there is no dependancy on the impedance of the speaker system... The real interesting things happen when you take the real impedance of the speaker into account).

At least, wed need:

- Coils with editable R and mH
- Capacitors
- Resistors
- Shunts

The passive filtering should be right before "the box", not behind the amp, in front of the cable:

amp - cable - x-over - speaker/box

AjHorn does it like this:

Click the image to open in full size.

nod as flexible as BoxSim, but sufficent.
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