2 Amps => Kustom B200 100w@8 ohms, and a Little Mark II 300w@8 ohms. The Little Mark II is also rated at 500w@ 4 ohms. The cab into which I want to install new speakers is the original Kustom-style 2x 15" enclosure, the salient point being that although it is a ported cab, the back end is sealed...