I found a pair of these offered online only a block from my home, so I grabbed them for a good price. Does anyone recognize this model, and how would one sound as a guitar speaker on its own? They read 4.8 ohms, which apparently indicates they are 8 ohm speakers. What should I expect driving one with my 5W 8 ohm Muchxs Champ? I assume I need to keep the power down due to their 50 year age. What should minimum cabinet size be? Thanks.