For what it's worth, the Beta 215 would have had two 8 ohm 81-0145 speakers in it. The 145 was a standard workhorse for many products...2" coil, 45 oz magnet. The 4 ohm version was the 81-0144. Good for about 200 Watts, rated at 100. Yep, remember the Beta 410, not sure if that one made it into a catalog, but I know we produced them.