Bought this speaker to replace the MC-90 (Mesa/Celestion 90watt Black Shadow) speaker that came in my new Mesa 5:50 Express Plus. The former speaker was just too dark for my liking, not articulate enough. No matter how I adjusted my tone knob on my guitar or treble settings on the amp, it sounded like there was a blanket covering my amp as I played. When the new V30 arrived I hooked it up to a home stereo for a few days at moderate level to break it in, then I installed it in my amp and wow, the amp came to life! Gone was the blanket that covered it before. Very glad I purchased this speaker, otherwise I would have gotten rid of the amp. So now instead of selling my amp, I am looking to sell the MC-90 instead!