GoodSoundClub - Romy the Cat's Audio Site

In the Forum: Horn-Loaded Speakers
In the Thread: Le C'leach horn rear chamber volume

Post Subject: There is no way to generalize it is you care about sound.Posted by Romy the Cat on: 11/4/2009

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

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