how much power should i expect in general when i parallel 3 opa541 chips with +-21DCV(42.6V total) and drive a 2 ohm sub (dual 4 ohm voice coils hooked in parallel to give 2 ohm)
Accourding to the datasheet, the output swing will go within about 4 V of each rails so the maximum voltage that this could drive will be about +/- 17 V. A sinewave at +/- 17 V (that's 34 V p-p) is 12.0 V rms. Convert that to power into 2 ohms, and you get 72 W rms (P = V^2 / R). Given the currents that you will be driving, you could easily get away with just two '541's instead of three, and still get the same output power. Or if you kept three, you could increase the power supply voltages to get more power.
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