4000 RPM Audible Vibration?

Journeyman said:

Here's an idea. Get a $7 bluetooth microphone that connects to your phone. Try taping the mic in various locations and see where the sound is loudest.

Mine does feel like it wants to shift around 4K for "normal driving," but she really likes it when you pull back on her ears

https://www.amazon.com/TXTUNE-Microphone-Cancelling-Lightning-Recording/dp/B0D7H34J4L/ref=sr_1_8?crid=1J9MZLG8CCF8X&dib=eyJ2IjoiMSJ9.J9mj5mdiZ1W_Y2tfATNP17ZPQUMdCBm-g3cV0PQc7BUYDsV9cQ1gI9q2mhuWsg_4bsxnd759GbQldEOm_JkmCirQ1KNVpMNi0QJd_Wl9Z1VNDAQaEs2wjJhNtEPqQZSb1NhGwqbJWu5BHcFQ2LowATVxhrOvXOKT-qYH9Z3uMmHnOivS0DIB2HkR1mraN0Xe3MROml-srHozPPqXzzFEydTF-vesHnV8W15U_xMfhbGsTBQr2zdvtDqguYbdr_6TDMK6RGqYMYB5FBwgoux1K8_vGbb58n8CdPSbmlJ60VA.mEaNlkFhh8hCfFiKt_5A5DUYmdtxUbTQ6KMmRWbU8Xg&dib_tag=se&keywords=cell+phone+lavalier+mic&qid=1757982483&sprefix=cell+phone+lavalier+mic%2Caps%2C148&sr=8-8

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