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The ridges or fins are heat sinks. The new Class D amplifiers that are used by many companies including Velodyne, are more efficient and produce less heat so these are no longer required.
 

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Quote:
Originally Posted by Test123455 /forum/post/20813076


On the back of the sub on the amp, why do some have ridges and others not? Is it to help with heat dissipation?

Those "ridges" are called heat sinks, and provide more surface area for heat to escape from the amp. Some built-in amps run hotter than others. Some are designed to use the metal structure of the amp to dissipate heat.


In my opinion, heat sinks are a plus, however, not a necessity.
 
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