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11-04-2009 Post does not mapped to Knowledge Tree
js
Posts 2
Joined on 11-04-2009

Post #: 1
Post ID: 12132
Reply to: 12132
Le C'leach horn rear chamber volume
fiogf49gjkf0d
Hello!

Could anyone please advise me as to the recommended rear chamber volume for a Le C'leach horn with a throat of 240cm2, mouth of 7089cm2, length of 47cm, cutoff of 160Hz, T of 0.8?  I'm thinking of using a Beyma 122Nd which has a sd of 530, Bl of 24.2, sensitivity of 103dB, fs of 56Hz, Re of 5.2ohms, Qes of 0.14, Qts of 0.14, Vas of 72l, Vd of 106cm3, Le of 1.5mH.  Front chamber volume is 433cm3, (not including the cone volume).
11-04-2009 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,540
Joined on 05-28-2004

Post #: 2
Post ID: 12139
Reply to: 12132
There is no way to generalize it is you care about sound.
fiogf49gjkf0d
 js wrote:
Could anyone please advise me as to the recommended rear chamber volume for a Le C'leach horn with a throat of 240cm2, mouth of 7089cm2, length of 47cm, cutoff of 160Hz, T of 0.8?  I'm thinking of using a Beyma 122Nd which has a sd of 530, Bl of 24.2, sensitivity of 103dB, fs of 56Hz, Re of 5.2ohms, Qes of 0.14, Qts of 0.14, Vas of 72l, Vd of 106cm3, Le of 1.5mH.  Front chamber volume is 433cm3, (not including the cone volume).

Js, sorry to disappoint you but there is no answer to this question. Thos type of the questions are for the “HornResp academics” – at my site they, thanks God, have no reason to show up. Why do you care about the rear chamber volume with such a precession if you never will be able to calculate the back chamber volume precisely? Will you be able to measure the exact volume of your Beyma’ back basket? I do not think so. Also, each single driver reacts to a given loading differently in term of sound. It is absolutely impossible to predict to which resonance frequency you need to target your loaded driver. I mean you can slide the Fs with back chamber up and down - it all will be right and it all will create different sound from the driver. If you use midbass horn he SOME perdition might be made as you might want to get max amount of bass from it. In your case of your 160Hz La-horn I do not think that you would shoot for more bass but rather for better MF sound of your driver. Only god would know how YOUR driver will react to back channel dumping.

The Cat
 


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
11-04-2009 Post does not mapped to Knowledge Tree
js
Posts 2
Joined on 11-04-2009

Post #: 3
Post ID: 12141
Reply to: 12139
Le C'leach horn
fiogf49gjkf0d
Thanks for the reply.  I'm using a Jabo KH-55 horn for hf/upper mid, so I think I'll have to experiment with different size chambers.  Beyma quote the volume displaced by the driver as 5.5 litres, so I'll start by trying a 9 litre (gross volume) back chamber.
11-04-2009 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,540
Joined on 05-28-2004

Post #: 4
Post ID: 12142
Reply to: 12141
Forget the open-air T/S data.
fiogf49gjkf0d
 js wrote:
Thanks for the reply.  I'm using a Jabo KH-55 horn for hf/upper mid, so I think I'll have to experiment with different size chambers.  Beyma quote the volume displaced by the driver as 5.5 litres, so I'll start by trying a 9 litre (gross volume) back chamber.

Js, you can’t imaging imagine how might irrelevant all this information. This T/S data is so much not applicable for horn loading, or at least need to be interpreted in absolutely different way then it was done in case of box speakers. The Beyma quote the volume displacement of 5.5 liters is no meaning at all. Are you planning to use it for acoustic suspension? Of course not! What the size of the volume displacement has to do with back chamber ion horn? The exertion, displacement and anything else imaginable for f a horn-loaded driver will be absolutely different then in open air and ALL T/S data shall be trashed as soon you load the driver. Do not waste your time to ask me question or even to think about it. What you do need to spend your time is to learn how YOUR driver SOUND will be changed with change of the of the back chamber volume.

The Cat


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
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