Troligen går det bra med lägre spänning för det begränsar bara maximal utnivå.
Du kan läsa konstruktörens resonemang om allt teknist om du inte redan satt dig in i projektet.
POWER SUPPLY VOLTAGE? Before going too far with selecting components (like op amps) it’s good to know the power supply voltage. To achieve 6 - 7 volts RMS output you need about 20 V peak-to-peak. Accounting for the appropriate voltage drops, a +/- 12 volt (24 volt total) power supply should work depending on diode drops, and how close the stages can swing to the rails under load. This is another area where some designers get carried away. Higher supply rails limit your choice of components and create much greater power dissipation (waste heat) in the output stage. Power is a function of the square of voltage. So as the power supply voltage goes up, the thermal losses are exponentially greater and the amplifier is less efficient. You want the voltage just high enough to get the job done and no higher.
https://nwavguy.blogspot.com/2011/07/o2-design-process.html
