I used to think that the problem with my speakers sound quality was in the speaker itself, but now that i have replaced all 4 door speakers with alpines...I still have the same problem, and it's with my back left door speaker, it has continued to "cut out" and "cut in". Plus, i had 'Professionals' install these speakers, those at Circuit City. No matter the volume, this speaker, continues to just cut out constantly. Could i have a loose connection or what?

1995 Ford Countour SE Kenwood Excelon Reciever Polk Audio 6x9 speakers 'teal mobile'