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Marc HENRY wrote:

La Grande Castine will not be as expensive as Cessaro Gamma. i am sorry but i cannot answer to all questions, for several reasons you can understand. we have tested many drivers since the early prototype of La Grande Castine. BMS were the very first. i am a bit surprised that anybody here recognize the brand name of the bass horn speakers :-) As Romy mentionned, the electric cutoff of the MF is close to the acoustical cutoff of the horn. this is not so audible around 300Hz. i never do such a thing in the 600-3000Hz area ! even if the crossover is 6db everywhere, i confirm that the effective cutoff of the bass horn is really 300Hz. there is no MF pollution comming out of this horn. I am proud of this phase plug :-D

Marco, price is not a mach of a subject at this site. If read around then you will see that quite a few horns systems or ideas were passing thought my attention but very few met any more or less favoriteable acceptance.

As now, there are 2 things that I would mention in context of your speakers.

First: do not be afraid to run your upperbass higher then 600Hz. I do not know how about the 3000Hz but the higher out of upperbass is not a pollution, even though your upperbass has angled axis with all time-alignment consequences. Even if your MF compression driver can handle confidently 300Hz and to produce interesting sonic result while doing it (that I doubt) then it does not mean that your upperbass mast stop at 600Hz. Let presume that you use woofers with copper caps that would control the inductance change (to a degree), even then there is no need to keep the 600Hz firm. (BTW, I do have an idea how you control low pass since you are proud of this phase plug – my compliments and I will go there for the reasons you proposed to understand.) Still, you might feel that in your situation the low-pass of your upperbass sound fine but it might be very much not the case in a slightly different room. An ability of the MF and upperbass to work an octave of a half octave together is a very good tool to control the weight of fundamentals. It would depend from the room and the listening distance. So, if I were you I would tap the coil that roll of your upperbass with 3-6 taps. Letting uses to set electric crossover point at let say 600Hz, 800Hz or 1000Hz. In your specific case (dipole and axis) you shall not worry about the timing problem that would arrive in other cases.

Second: As I understand you are moving from DIY environment to making a Hi-Fi commercial speaker. Respecting the time and money you have devoted to the venture I would like to give you a world of advice. The DIY and High-End commercial trades are very different animals. In DIY you mostly face extremely ignorant, low demand, cronyism driver audio-lumpenproletariat that would kiss you in ass during your diarrhea. The business  “success” in DIY environment is about to be mutually friendly, promise internal loyalty and telling to each idiot you face that s/he is “special”. The High-End commercial trade is very different. As in DIY trade the sound of your speaker is irrelevant. What is relevant would be the amount and the quality of personal you sight up to promote your products. Under the “quality of personal” I mean that you need to built a network of the dirtiest scams around the word, to collect the creatures who would fuck own mother for 3 easy payments of $19.95. Like it or not but those people, not you and not your speaker, will be something that assures the success of your business venture. I wish you sign-on to your projects the dirtiest and the most audio-retarded inhabitants of audio. Then your new acoustic system might get some momentum in this “hobby”

I wish you good luck with your new project. Please, when you finish uploading to your site all public information about the “La Grande Castine” then past a note at my site.

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