I want to build my own subwoofer. If I go forth with this, I'm looking for devastation and tragedy. lol
I know what kind of materials I'll be needing, and how to put it together. I may even implement my own proprietary design elements.
What I'm not familiar with is the relation between the voice coil and motor structure.
My plan is to have a motor consisting of 5 ferrite ring magnets being 0.75"tall, with 3.75" ID, and 7" OD.
With the space the pole peice will take up, the voice coil and former will have to be 3.5-3.6" in diameter. First qestion is, does it matter what the diameter of the coil is? Or does it have to be as close to the ferrite ring ID as possible?
I also plan on having extreme excursion. Because of this, I don't want a long voice coil. Instead, I want to copy a design I saw in the underhung TC thread. The plan is to have a short 1 inch max voice coil length. Now, how many layers will it need? What is the effect of more or less layers? Is it simply to achieve impedance or higher QES, etc???
Also, where should the resting position of the voice coil be? Directly in the middle of the motor structure?
More questions coming soon as I think about this some more.........