I have a Peavey 15" Black Widow in a Peavey enclosure. Playing my Framus bass thru it last nite I noticed that the 5th, 6th and 7th fret on my G string sounded dead with NO sustain. Put it thru my Ampeg and it sounds fine with plenty of sustain and clarity. The Peavey lacks a horn. Is it possible that the speaker in the speaker in the Peavey enclosure does not have the range for those frequencies or just going bad?