The three resistors controlled by the switch are 15, 15 and 30 ohm. It's a little confusing to me how the slide switch is wired. When I measured the resistance with the drivers removed (resistance across the leads going to the tweeter) I got 31.8 ohms at the +3 dB setting; 10.6 at the Norm setting; and 7.6 at the -3dB setting. Given some tolerance, it seems the -3dB setting parallels the two 15 ohm resistors, and the Norm setting parallels the 30 and one of the 15 ohm resistors.
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Here's my crude schematic of the crossover with the switch details uncertain to me.
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