Power supply for amplifier and active crossover network

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If you're building a 2-way active speaker, you need to power the crossover network, which ideally wants +/-15 volts along with a power amplifier which wants 12 or 24 or more volts. How do you power both with a single (external) power supply? Sorry for the noob question, please post links if it's more convenient. I'm happy to study up.

Josh
 
lm317-lm337-variable-powersupply.jpg
For +/-15v.
 
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