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Nah, 8kHz just seems to be the favorite for high performance controllers. The Soliton1 uses 8KHz under high power situations I think. It's a smoothly varying tradeoff from 0Hz to like 50KHz. At 50KHz, it's a molten fireball of waste heat. At very low frequency, the poor capacitor can't handle the huge current ripple, and it ends up just taking everything from the batteries, and you have no control of current.
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