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Speaker Question


far0n
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[quote name='far0n' timestamp='1327342003' post='1509645']
Yeah same cones, just different impedence. I'm assuming the 4 ohm cone will have more windings?
[/quote]If anything less, but that assumes the two coils use the same wire gauge, and you can never assume anything. In any event if you need to know the end result difference modeling software will tell you.

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To lower the resistance you need less wire or thicker wire or a combination of both. Manufacturers use all sorts of methods and if you are a major manufacturer you can get all sorts of impedances made up. If you are a home builder then beware, Most manufacturers do their design work on 8ohm speakers and the magnet gap is designed to work with an 8 ohm coil. To make a 4 or 16 ohm option the coil is changed with the 4 ohm version shorter reducing the excursion the speaker can cope with before distorting. The 16 ohm coil is often longer giving more excursion but at the expense of having more of the coil outside the magnetic field reducing efficiency and decreasing the control the magnet has over the speakers movement. This doesn't have to happen but completely re-tooling is expensive and just changing the voice coil by adding or subtracting turns isn't.

As BFM says you need to check before using a speaker in a design, the 4 ohm and 8 ohm models probably won't be the same.

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