no high frequencies

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lately i have had a couple of amps in the shop with this symptom.they both came in with blown mosfets which i replaced.all i get out of the speaker is bass,no mid range or hi frequencies at all.also,the speaker cone vibrates very bad.where should i be looking for this problem.90% of my work is lcd,plasma tv's,dvd vcr,head units,ect.don't get a lot of amps in so i am still learning.
 
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