Hornresp - Page 328 - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 4th April 2013, 05:31 PM   #3271
NEO Dan is offline NEO Dan  United States
diyAudio Member
 
NEO Dan's Avatar
 
Join Date: Jun 2008
Location: N.E. Ohio
I'll thrown in my

The idea of passive filters is an interesting one. We have always had the option to export the impulse, and from there you can do all manner of acoustic filter "stuff" externally.
For me the need is for physical performance with active HPF, passive would also be nice. Being able to see what happens with excursion at the bottom of the pass band would be of HUGE benefit, and you can't get that working from an impulse.
__________________
Regards,
Dan
  Reply With Quote
Old 5th April 2013, 07:16 AM   #3272
Jmmlc is offline Jmmlc  France
R.I.P.
 
Join Date: Oct 2005
Quote:
Originally Posted by NEO Dan View Post
I'll thrown in my

The idea of passive filters is an interesting one. We have always had the option to export the impulse, and from there you can do all manner of acoustic filter "stuff" externally.
For me the need is for physical performance with active HPF, passive would also be nice. Being able to see what happens with excursion at the bottom of the pass band would be of HUGE benefit, and you can't get that working from an impulse.
Hello,

I think both active and passive filtres are interesting to be introduced in Hornresp, but that's double work.

We can say that the active filter approach relates to Eg in the Hornresp input data window, while the passive filter approach relates to Rg.

Best regars from Paris, France

Jean-Michel Le Cléac'h
  Reply With Quote
Old 5th April 2013, 07:25 AM   #3273
diyAudio Member
 
Join Date: Nov 2006
Quote:
Originally Posted by Jmmlc View Post
Hello,

I think both active and passive filtres are interesting to be introduced in Hornresp, but that's double work.
Not necessarily. The calculations can be almost the same, the active part can simply be fed to a constant impedance instead of the changing one on a real speaker.

How about implenenting a plugin interface at Rg and Re, so every filter one desires can be flunged in there, let´s build some VST Interface, this way David doesn´t have to do the filterstuff himself an we can even implement FIR Filtering (hihi, just playing with my mind, just kidding).
  Reply With Quote
Old 5th April 2013, 07:33 AM   #3274
diyAudio Member
 
Join Date: Jun 2007
Quote:
Originally Posted by Jmmlc View Post
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).
Hi Jean-Michel,

Thanks for the feedback.

If I understand correctly, the two HF uplift components are the only ones missing from my template (if we assume that only one RLC impedance equaliser is required).

Would the template still be worth having even if HF uplifting was not allowed for?

Kind regards,

David
Attached Images
File Type: png filter_2.png (8.7 KB, 89 views)
File Type: png Filter1.png (5.9 KB, 57 views)
__________________
www.hornresp.net
  Reply With Quote
Old 5th April 2013, 07:41 AM   #3275
diyAudio Member
 
Join Date: Nov 2006
I´d even go either for the simple solution of just having some High-Pass Filtering and just stick with that - or go all the way and do the matrix thing, so all cases are covered. In Jean-Michels Example, you have:
- Two Impedance eq for the lower and upper end
- HF uplifting
- Highpass uo to 3. Order

Notch Filters, Lowpass, Allpass, etc.. - are still missing.

Of course, one could argue that you don´t need those a lot - but I bet there are people who will be asking for it (e.g. someone who wants to get rid of a resonance in a mid-Horn System and either wants to use a helmholtz resonator as a mechnical solution or do it in the x-over...)... So people will ask for extensions of the limited model and maybe its less work to do the flexible soultion in the first place ?
  Reply With Quote
Old 5th April 2013, 07:55 AM   #3276
diyAudio Member
 
Join Date: Jun 2007
Hi Everyone,

Thanks for all your filter comments. If anything was to be done in Hornresp, the functionality would be confined to passive filters comprised of pure resistors, capacitors and inductors, and most probably be restricted to networks that can be specified within the 12 component template previously posted.

So don't get too excited... :-).

Kind regards,

David
__________________
www.hornresp.net
  Reply With Quote
Old 5th April 2013, 07:56 AM   #3277
Jmmlc is offline Jmmlc  France
R.I.P.
 
Join Date: Oct 2005
Quote:
Originally Posted by David McBean View Post
Hi Jean-Michel,

Thanks for the feedback.

If I understand correctly, the two HF uplift components are the only ones missing from my template (if we assume that only one RLC impedance equaliser is required).

Would the template still be worth having even if HF uplifting was not allowed for?

Kind regards,

David
Hello David,

Your template will be definitevely worth.

Eventually for every RLC circuit a wizzard could be opened at demand in order to introduce the resonance frequency and Q...

Circuit Theory/RLC Circuits - Wikibooks, open books for an open world


Best regards from Paris, France

Jean-Michel Le Cléac'h
  Reply With Quote
Old 5th April 2013, 08:09 AM   #3278
diyAudio Member
 
Join Date: Jun 2007
Quote:
Originally Posted by Sabbelbacke View Post
Notch Filters, Lowpass, Allpass, etc.. - are still missing.
Hi Sabbelbacke,

I must be missing something - isn't the two-component network shown in the attachment a simple low pass filter?

It can be specified using the previously mentioned template.

Kind regards,

David
Attached Images
File Type: png LPF.png (5.4 KB, 57 views)
__________________
www.hornresp.net
  Reply With Quote
Old 5th April 2013, 08:17 AM   #3279
Kolbrek is offline Kolbrek  Norway
diyAudio Member
 
Kolbrek's Avatar
 
Join Date: Aug 2007
One suggestion: if each series LRC-branch in David's template could optionally be changed to a parallel RLC circuit, we could get quite a bit more flexibility.

-Bjørn
__________________
Dynamics to the people!
  Reply With Quote
Old 5th April 2013, 08:32 AM   #3280
diyAudio Member
 
Join Date: Jun 2007
Quote:
Originally Posted by Jmmlc View Post
Your template will be definitevely worth.
Eventually for every RLC circuit a wizzard could be opened at demand in order to introduce the resonance frequency and Q...
Hi Jean-Michel,

Thanks for confirming that the 12 component template would still be of some value.

The filter tool would show the SPL response and the diaphragm displacement resulting from having a filter network between the amplifier output and the loudspeaker input. The tool would accept R, C and L component values as specified by the user, but not deal with resonance frequency and Q values.

Kind regards,

David
__________________
www.hornresp.net
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Hornresp Class FlipC Subwoofers 8 3rd November 2008 06:23 PM
Some questions about hornresp brsanko Full Range 4 18th October 2008 09:36 PM
Hornresp help / JX150 316a Multi-Way 0 11th February 2004 03:56 PM


New To Site? Need Help?

All times are GMT. The time now is 01:57 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2