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Old 03-24-2009, 10:55 PM
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Question coils

whats the difference in coils for SPL SQ or daily SQL

1. kapton, aluminum, copper coil
2. flat wind or regular
3. layers of the coil ex. 4layer 8layer



want to learn and want to see what ppl know about this topic.
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Old 03-25-2009, 12:57 PM
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Originally Posted by danyman View Post
whats the difference in coils for SPL SQ or daily SQL

1. kapton, aluminum, copper coil
2. flat wind or regular
3. layers of the coil ex. 4layer 8layer



want to learn and want to see what ppl know about this topic.
1. Aluminum coil = cheaper(better for your wallet),lighter(better for SQ but..), less conductive(not so good for SQ)

1a.copper coil = heavier(better for SPL cause...)generally speaking will take more power and dissaptes heat better. However it's more expensive(bad for your wallet)more conductive-Better for SQ but it's heavier than aluminum.

1c. Kapton- supposted to be the best of both worlds but I've never seen it nor know much about it

2. Flat wind vs. regular: with a flat wound coil you can fit more voice coil in the same amount of space which means a stronger magnetic field which means more cone movement. However more voice coil means more weight so it may even out, although my sub in perticular the flat wound coil will handle more power to is better suited for a SPL or SQL configuration. I use mine as a daily driver and the SQ is very good as well(I have the copper flat wound configuration)

3.4 layer vs 8 layer- same deal as flat vs. regualer more coil=more movement which should mean more volume but it does make the moving assembly heavier so you need a better amp with a better damping factor to retain any SQ qualities.
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Old 03-25-2009, 05:50 PM
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I have little to say on this as none of these are the criteria that need to be written in stone to differentiate a good vs great loudspeaker. The criteria for a great driver is systematic going from copper to aluminum can be great IF the system design changes as well. Copper and aluminum have different behavior patterns the engineer needs to design to the material properties (as the one who makes Tokyo shutter mentioned).

I would add to the list that copper deforms less under a thermal load (high current load) but if aluminum is wound correctly its deformation is predictable (both can be properly engineered but a straight swap would not work as well).
Also the flat windings tend to produce a more even magnetic flux and would require less compensation winding so it should be a denser flux and easier to control.

Last edited by JohnVroom; 03-25-2009 at 05:53 PM.
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Old 03-25-2009, 06:21 PM
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Speakers are way too complicated to just look at any individual part to determine performance. It's really all about the total package and the engineering.
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Old 03-25-2009, 06:47 PM
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It really has nothing to do with SPL vs SQ per say, as John and alpha suggest... Each aspect of a coil has a trade off.. (And you could add nomex fomers and aluminum wire to your list which are both quite common too)


On the otherhand if I'm choosing what I want in a coil, I'll pick flatwound copper on an aluminum former.. every time.. but that is just my preference..
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Old 03-25-2009, 06:51 PM
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interesting lol. well this is the thing. i can choose either alu. or copper. flatwind or normal. sooo lets say your looking at just 1 sub. and you had to choose these options. what would ppl pick .

haunz says copper flatwind. curious to see what other ppl would pick
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Old 03-25-2009, 08:15 PM
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Originally Posted by JohnVroom View Post
... none of these are the criteria that need to be written in stone to differentiate a good vs great loudspeaker. The criteria for a great driver is systematic going from copper to aluminum can be great IF the system design changes as well. Copper and aluminum have different behavior patterns the engineer needs to design to the material properties...
I totally agree.

Also I'll add that Kapton is a coil former material not a coil winding material. It was initially developed by Dupont as a high temperature plastic for the aerospace industry. It's lighter than aluminum and is non-conductive, both of which contribute to a higher efficiency rating for an otherwise identical speaker with a metal former. The non-conductive former eliminates eddy currents which waste energy (even a split Al former has eddy currents).

No matter the type of speaker, material selection must suit the end goal. In my opinion no material is the single best. Even tweeters with diamond diaphragms have drawbacks.
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Old 03-25-2009, 08:48 PM
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Originally Posted by danyman View Post
interesting lol. well this is the thing. i can choose either alu. or copper. flatwind or normal. sooo lets say your looking at just 1 sub. and you had to choose these options. what would ppl pick .

haunz says copper flatwind. curious to see what other ppl would pick

i had a pair of fully loaded Fi SSD's flatwound copper coils.
other than the fact that these woofers smell... power handling was increased and the woofers took a beating.

although, i am curious as to how aluminum coils would handle ample amounts of power. i've been thing i'm reconing my AQ into a 15" with aluminum coils...
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Old 03-26-2009, 01:23 PM
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Originally Posted by jalat View Post
i had a pair of fully loaded Fi SSD's flatwound copper coils.
other than the fact that these woofers smell... power handling was increased and the woofers took a beating.

although, i am curious as to how aluminum coils would handle ample amounts of power. i've been thing i'm reconing my AQ into a 15" with aluminum coils...
mine is also fully loaded and the copper flatwound(which i have) significantly increases the power handling. If I had the choice I'd pick the flatwound copper everytime IF cost wasn't a factor. Although I took those options even with the extra cost!
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Old 03-26-2009, 04:02 PM
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i wonder if someone tryed silver coil
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