You might think I'm crazy, but HW-40s have always had a very high-pitched noise I could hear coming from somewhere in the motor circuitry as long as the motor is running. It's not exceptionally loud or obnoxious but always noticeable and it's always been there across multiple units so it's not a sample defect.
Does anyone know whether the implementation of the direct drive circuitry in the Avenger Direct and/or Titan Direct also have this noise?
I would imagine they would, unless VPI changed the motor control circuitry for those models, and I don't know why they would have.
Interesting observation! That consistent high-pitched whine on HW-40s sounds like PWM switching noise or coil whine from the motor driver. It’s subtle but perceptible to sensitive ears, and across units suggests a design trait, not a defect. You might reduce it by adding damping, rubber mounts, or checking grounding. Curious if firmware updates alter the frequency. Reminds me how wordle unlimited trains you to notice patterns—once you hear it, you can’t unhear it!