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"Why is the Laing pump so noisy in comparison to other pumps?" Is it doing a trade-off of noise versus efficiency that other pumps don't? Or is it made with cheaper tolerances so that the vibration from torque on/off is less damped (i.e. accumulating the energy from torque accel over time to deliver a rapid impulse when the slop factor is reached)?
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Maybe you are missing the key(?) : The D4 coils are fed with simple
square wave AC, all the others are sine wave driven
(apologies if you already knew this!)