I have gone to Speed of Sound Technologies for several of my cars, and they always explain in detail what I am getting and how it works. In one car I got a full custom stereo system, and after I picked it up they took the time to explain how it all works.
They are very professional; they make sure I understand the product and answer all my questions before I leave. The finished product is great. I have never had a problem or any issues with any of the products I've received from Speed of Sound. I would highly recommend them because it is obvious they know what they are doing. They are the best around from that perspective.
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