This article is from the Car Audio FAQ, by Ian D. Bjorhovde (ianbjor@mobileaudio.com) with numerous contributions by others.
If you do decide to buy a signal processor, try to stick with reputable
brands like: AudioControl, Clark, Crystal-Line, Phoenix Gold, Rane or
Clarion. Try to stay away from brands such as Petras, Urban Audio
Works and Kraco.
 
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