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Voice Coil Wiring and Transient Response


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Steven Kephart 
Platinum - Posts: 1,737
Platinum spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spaceThis member consistently provides reliable informationspace
Joined: November 06, 2003
Location: Oregon, United States
Posted: October 18, 2005 at 11:45 PM / IP Logged  

haemphyst wrote:
Yes. It is called AMP TURNS. The more wire you can have in a voice coil RIGHT IN THE MAGNETIC FIELD, the better your efficiency will be. Short, multi-layer voice coils are perfect examples of this. Herein squats the toad. The more turns you have in a short voice coil - to keep as many turns as possible in the magnetic field - the higher your inductance. There goes your transient response. Additionally, there goes your Xmax, as well. This is one of the dilemmas that keep speaker designers like Dan Wiggins, of Adire Audio fame, awake at night. can you add more turns on a longer coil? Yes, but add the corresponding inductance increase (due to the additional turns of wire) and the additional mass (due to the bigger former and added wire weight), and you end up with an inefficient, slow driver - BUT you gain Xmax.

Oddly enough Dan Wiggins loses a lot less sleep at night than other engineers because he has the best answer to this dilema.  The XBL^2 motor he helped invent is much more flux efficient than other motor topologies for a given excursion. 

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