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BandPass or Folden Horn

Printed From: Speakerplans.com
Category: Plans
Forum Name: Other plans
Forum Description: Discussion / Questions about all the other plans
URL: https://forum.speakerplans.com/forum_posts.asp?TID=10251
Printed Date: 24 November 2017 at 2:51pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com


Topic: BandPass or Folden Horn
Posted By: RodDJ
Subject: BandPass or Folden Horn
Date Posted: 03 June 2007 at 9:10pm
 
What type is this desing, folden horn or bandpass.
Can go lower if add more cabs, frecuency reponse is 50-250hz 
 
 
  http://photofile.ru/users/tda-audio/182333/30379447/#mainImageLink - http://photofile.ru/users/tda-audio/182333/30379447/#mainImageLink



Replies:
Posted By: ceharden
Date Posted: 03 June 2007 at 10:01pm
Simple folded horn, small or no compression chamber so not a bandpass.


Posted By: Rockin
Date Posted: 03 June 2007 at 10:02pm
Definately a folded horn design.




Posted By: mobiele eenheid
Date Posted: 04 June 2007 at 2:46pm
Either a folded horn or a bandpass horn (BPH/read FAQ's on speakerplans).
 
Wkr Johan


Posted By: RodDJ
Date Posted: 06 June 2007 at 3:37am
I need to know if this design evolves well, for different rates like R&B, Rap, reageton and pop (madona, britney and more), I play on small party  from 100 to 400 persons.
How much cabs need for good kick
some good design for these events ? give me advices
 


Posted By: Saul
Date Posted: 04 August 2009 at 9:13am
Originally posted by mobiele eenheid mobiele eenheid wrote:

Either a folded horn or a bandpass horn (BPH/read FAQ's on speakerplans).
 
Wkr Johan

i dont see how it can be a bandpass horn without a front chamber. 


Posted By: mobiele eenheid
Date Posted: 05 August 2009 at 2:18pm
I don't see how it doesn't have a front chamber.... I really don't, care to elaborate?

Best regards Johan


Posted By: darkmatter
Date Posted: 05 August 2009 at 5:23pm

saul i believe if you look at the bottom left drawing on those plans and drew a line coming straight out of the dust cap, the volume of air in the horn to the right of this line would be front chamber, as well as the volume of air sitting 'in' the cone.

though i agree it's confusing as it looks like there's continuous expansion right from the start if you look at it that way.

i guess its the large rear chamber that suggests this design works using a bandpass effect.

rod you could also take a look at some of the selenium dual 15" horn designs, centauri's dual 15" design (search 'centauri phase plug' on google), or walt contour's 12" punisher design (speakerstore.nl) for inspiration.

you may find dual 15" or 18" reflex boxes are more versatile and easily transportable for what you do, easier to build too. i'd estimate you'd want a minimum of two of TDA audios cabinets per side.



Posted By: Jake_Fielder
Date Posted: 05 August 2009 at 5:43pm
Originally posted by Saul Saul wrote:

Originally posted by mobiele eenheid mobiele eenheid wrote:

Either a folded horn or a bandpass horn (BPH/read FAQ's on speakerplans).
 
Wkr Johan

i dont see how it can be a bandpass horn without a front chamber. 
 
Yeah the air in the cone and the infront of the driver, "counts" as the front chamber


Posted By: bitzo
Date Posted: 05 August 2009 at 8:25pm
so...what is the minimum volume to obtain the bandpass effect?

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http://www.unitedroots.it - United Roots SoundSystem site


Posted By: darkmatter
Date Posted: 06 August 2009 at 2:10pm
My completely unqualified opinion - it's open to interpretation rather than there being a defined minimum volume. In that sense there will always be some bandpass effect because there'll always be some form of front chamber. Even in a 'pure' phase plugged horn, there is a front chamber in between the cone and the phase plug. I'd use bandpass to describe a design where there's a deliberate and designed in negative 'expansion' or front chamber before the horn throat/positive expansion starts.



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