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slowmotion wrote:

I hope anyone interested in JMLC horns read the last four links,  where Jean-Michell writes about his reasoning for his horn profile.

Yes, Jan, tanks it was interesting. Unfortunately the words means little in this and it is necessary to have both of them with the same drive in order to say anything. Also, only God know how each driver would react to different profile and not different curves would couple with the rooms. This is the biggest problem with horn – no one could say anything and very few people actually had a chance to go over different scenarios and to evaluate what works and what do not. With those horns there are so many variables that nothing is objectively predicable…

slowmotion wrote:

I think the Cogent effort is very interesting, not many people are into making field coil compression drivers these days. I wish them the best of luck.

Probably because to make a permanent magnet of this size would be too expansive? BTW, My personal experience with field-coil was not so thrilling. The field-coil is very popular idea within EBay intelligence and among the drivers droolers but in my room none of them behave interesting (none of them were compression) for bass. At least for bass they all were too soft. I am not saying that the Cogent guys would end up with the same results as I did but I feel that for upperbass a driver should be dry and crispy instead of “soft” and “wet”. The field-coils that I used were too “wet” and were locking some testerone.

slowmotion wrote:

I don't know why they insist on using conical horns , though. In my not so humble opinion conical horns suck. Big time. …

May I ask why? The only problem that I see is the size, that it king of their problem… Unless they would run 70Hz horn with a curve and then it all will go to a toilet.
 

slowmotion wrote:

Regarding horn bandwith, this is of course a subject in where  everyone and his/her grandmother have their own opinion. Personally I think 2,5 to 3 octaves should be reasonable.  But sometimes it isn't.  I have given up on 2-way systems, the compromises are just to great. 4-way systems seems like the most reasonable compromise, at least to me, you may even have to go 5-way. If you are very skilled or very lucky you just might make it with a 3-way.

Exactly!!!

slowmotion wrote:

Just some personal observations based on years of hornbuilding, I should probably mention that most of the horns I build end up in the trash or in the fireplace.

Oh, Jan, shut up! I’m trying to encourage people to "go horns" and even begun to brew a small community of my local Boston guys with horn installations among the local 300W SS idiocy. Then you, show up and discourage the people by disclosing to them the bitter Truth. :-)

The caT

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