I have been given two large speakers - which are around 19 years old - from
my parents. I have plugged them in as additional speakers, and they are
noticablely more quiet, and sound slightly muffled, when compared to the
other speakers. They don't have the same power when connected to the
idential amp.

What happens when speakers are blown? Can I repair something? I would love
to restore these to their original vitality, if that is possible.

Allan
Alberta, Canada.