So I have this Peavey classic 50 410 that I really like, but the speakers are starting to crap out. They kind of woof on the low end I dont really know how to explain it. Or if it is one or all of them. They are not tight in the lows at all maybe even blown. Although I'm not sure what a blown speaker sounds like. Bottom line is I would like to replace the speakers but I only have about 300 bucks in the amp. I need to find some good replacements even used is fine just dont want to have to spend more than the amp is worth to drop in replacements. Anyone have any ideas of how to approach this or should I just decide to put her down. Its an early 90's model with no labels on the speaker I asume that they are blue marvel. Thanks for any help!