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Romy the Cat wrote:

As I said above your you "experienced today  with GOTO" is just your transitional feeling and you will change this feeling many times. To accommodate a pair of 42Hz horn in a system is a year-long project otherwise you get an accidental result. In a few month loving your horns you will be sick and tired to wok around them in your listening room, or perhabs you will feel that the horn displacements changed acoustic in your room too much, as the result you decided to hide the horn while it sound  and integrated well... good luck with this projects. To drop driver into random horns and to love result is not the same as to get max from a given topology...

Regarding the new design. It is more to my liking, which might not mean anything. I do feel that the upper bass horn is a bit too bulky for your design. If you go for Tratrix then it will be juts 36" long and it would be way more balance. Also, having the midbass horn you have no need to push the last few Hz out of upperbass horn.

I do not like the frame. It has nice air feeling but I think it is too flimsy and good only for sketches. In the real word when you hook your horns and driver you will see that it will become incredibly heavy construction and even if you go with metal bars the thing will swing and lean. If you do inset to have this curved frame then consider on a back an arm with contra-weight that would balance the mass of the horns in front. You also will not able to move the hors up and de in this curved configuration - you might find it useful. If you insist to have this design of frame then add a surface at the bottom of the upperbass horn otherwise you would need 2 people to move it. Also, from the bottom of the frame, approximately from elevation of a tweeter run a single metal bar to the back of the floor circle. that would give you a third leg and will make all of it more pragmatic.

Regarding the proposal to lend me a pair of the GOTO SG-146LD-4 drivers to let me to experiment with them. I would decline. To make a proper horn for 146LD and to accommodate  it would be a project that would take more efforts then I willing to spend nowadays. Even if I own the driver I will let it sit in a box, wanting for time we move to next house.

The idea to make similar driver is not a bad idea - for bass reproduction it is very simple - no phase plug at etc... Everything hits the wall when we are taking about diaphragms. Are you willing to spend next 5 year of your life experimenting with diaphragm making? I do not have it now in me. Perhaps I will do in a future  but it would be in "project management" format and won't be doing everything myself as I use to do. The reality is that with an infant in my hands I do not do critical audio nowadays. Thomas just become to crawl two weeks back and become a bit less needy and it gave me some free room to spend for some more or less critical listening....

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