Greetings, all. I already have a solid state, modern-ish GK combo. Looking for a tube-based, versatile, yet classic-oriented alternative setup. Like the idea of a single 15" with a 2x10. Anyone tried this combo? Any phasing issues? Problems mixing and matching between lines? Any alternatives? Or just go with one of their many 4x10 options? Thoughts, opinions and experiences welcomed. Thanks in advance.