I just picked up an old '60's Univox bass amp, branded Lafayette. It brought back memories, having used these back in the day. Separate head & cab, 2-6L6's for power tubes, 15" non-original speaker. Amp works great (obviously not a great bass amp, but nice guitar tones). I can't tell what the speaker is, no markings of any kind, but it doesn't sound very good, while the head sounds great through other 15" cabs I have. What would be a nice replacement speaker for it, obviously it doesn't have to handle a lot of power, and I'd rather not spend too much for it.