Rerurn to Romy the Cat's Site

Jessie, a few comments.

The back chamber mechanism is good. Are you planning to do the same in the midbass horn? Since you most likely will not drive your upperbass all the way down I think that the back chamber mechanism  will be more effective at your midbass. Be advised that the driver will generate a lot of pressure in there and the sipping of air will reduce the effectiveness of the back chamber. I do not say that it will be bad if the pressure will be losing from it but I say it will change effectiveness. Also, do not forgets that most likely you will end up with the ultra low size of back chamber when the vertical back wall sitting to the driver magnet will farm already too large chamber. What you might end up doing is to glue to the back of the slideable wall a space-killing indentation that would have a contra-template of the Fane driver. This would effectively to push out the air from the driver sided. I would put even some filing into the driver frame’ holes… Also, turned John Hasqiun to your, Jessie, project and he pointed a very valuable point that you might overlooked. He suggested that this design shell have a way to vent the back chamber as it being adjusted, otherwise he will over or under pressurize the woofer cone and damage it.

The entire speaker looks very nice. Well thought and well executed. There are a few comments still. It feels that there is very little room for the tweeter to breathe. It is not the narrow firing tweeter and I think you might give to it a little bit more room. The frame that holds the Fundamentals Channel is is kind of odd esthetically. It looks like it was not from there. I do not know how bone-firm and how heavy your Fundamentals horn, but is it does need some support and cannot just to hang then you might consider to  use a harness around a horn and a single rod from the top of the frame to the horn. What I am trying to say that the support of the Fundamentals Channel might be more elegant…

Going for exponential midbass is probably good idea; most likely I would do the same if I go for 50Hz horn, I would most likely go for rectangular of for a shape with 2-3 straight side and 1-2 curved, juts for sake of esthetes. Unfortunately talking about the masking “appearance” of midbass horn it is is impossible to do not consider the given real-east envelopment. Since you, Jessie, live in rented apartment and most likely will move (well, when you finish you system they will kick you out of the building anyway) then you might consider to make the double-action midbass horns. What I mean is that pretend that you horn is 8 feet. So, you make the first 5 feet from the throat is firm and solid and the last , the most larger 3 feet, detachable and perhaps with odd edge profile. The next time you move and realize that your horn would block your entrance in bathroom, or the corner of the horn blocks a half of your window and look to prominent on the room then you juts change the termination part of the horn…

It is very interesting to see what you do Jessie, in contrary to many audio people I know who just endlessly run their mouth on audio subjects you actually do the things. It is very stimulating to observe you progress. Whan you finish then bring your installation to a city with good FM programming and you will be getting from high-end audio and much as it possible to get from it.

Rerurn to Romy the Cat's Site