Hi SBJACOB
I am not suggesting that you replace your existing passive crossover networks. Just modify them to include SK3 bulbs if you are so concerned about protecting your drivers. Now if I understand your system correctly. You have a XR1001 electronic network between the woofers and the midrange horns. The BGW750C amp feeds the woofers and the BGW250D feeds both the midrange and the 2404s. And the 6000Hz passive network slits the signal between the midrange and 2404s. In the schematic below, what I don’t know is, what are the correct R1 and R2 values for your application. But, this is something that can be derived from studying other JBL networks that have SK3 bulbs. Now, if the 2404H driver has the same power handing as a 2412H driver, then the appropriate R1 value would be a 16 ohm 10 watt resistor. Otherwise, then a different value would be needed. Actually, for a home audio system I don’t see the need to fuses or SK3 protection bulbs. But, in a pro sound reinforcement system where microphone feedback could route several hundred watts into a HF driver the SK3 bulbs seem like a really good idea.
Baron030