lets get technical

Slow down turbo. Lots more research I'd recommend.

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Stop it.

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Why stop? This forum is mostly made up of topics such as "What will get louder", "How many dbz will I hit" etc and when a topic comes up that could actually produce some technical discussions you say to stop? Doesn't make sense to me. I would imagine you would want to encourage such topics, no?

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Will you even like the 'sound' of a lower distortion driver? They're certainly not for everyone...

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Lets get physical, physical..

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I want to build my own subwoofer. If I go forth with this' date=' 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.........[/quote']I remember being at this stage of my interest in audio and, more specifically, drivers and how they do what they do. I had the same questions and more. Your specific interest at the moment is in motor design and that's a good thing. There is almost endless information out there on the topic. You're starting backwards, though. You're listing off design parameters without any cause for them. You need to set goals, but to set goals you would first you need a criteria for why you are setting these goals. Usually, extreme excursion is not the result of having a short coil. If it is, it is either very clever or very expensive. Probably both. Extreme excursion may not be necessary at all. Best thing to do is start by studying T/S parameters. Understand what they mean, what they do, how they are tightly linked to each other or not linked at all. Know what will happen when you change any one of the parameters, or have a program that will tell you as you model different numbers. Then you will see why this coil length (wind width) or why that much steel. You will see why this many grams of moving mass or how much thermal capacity, and so on.

Books, online articles (not necessarily forums), modeling software, more books... Then execution of that knowledge with trial and error. Spare time and money will certainly help. If I had either of those, I would already have released my designs.

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