I need some wisdom here people. My current setup is a darkglass alpha omega into a fender bassman 410 of unknown age. Yes, I know the amp far outclasses the cab, but I wanted a lighter amp head and that's the one I liked. Now, I think the speakers in the cab are worn out. They make some strange and not nice farty distorted sounds at higher volumes. (but seemingly not all the time) I especially noticed it this summer on a couple outdoor gigs with bigger stages. Also, overall, this cab just sounds ok even when it is performing as it should. Now my questions are this: How can I tell for sure the speakers are shot? And, Is it worth it to consider replacing the speakers or just go for a new, better cab? I would like higher power handling capabilities and less weight. Also, I'd kind of like a cost effective solution.