What are underhung subs?

330px-Voice_coil_geometry.svg.png
 
The page we have up on the Lambda motor also discusses underhung motors and the benefits of the underhung. It's on page 2 of the paper here:

http://www.aespeakers.com/Lambda001-2.php

Three main benefits of the underhung are:

(1) The flux level is the same as long as the VC stays in the gap

(2) There is a lot of steel to absorb the heat from the coil.

(3) No matter where the VC is in the gap the steel core is the same, forcing its inductance to stay linear with excursion.

John

 
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