Hello Avt0bus,
Thank you for reaching out to Apple Support Communities, and we'll be happy to help in any way we can. We understand you're having issues with static noise in your left Beats Studio Pro. Try resetting them as described here to see if that resolves the issue: Reset your Beats on-ear or over-ear headphones - Apple Support
"Reset Beats Studio Pro, Studio, or Studio Wireless
- Press and hold the power button for 10 seconds.

- Release the power button.
- All of the Fuel Gauge LEDs blink white, then one LED blinks red. This sequence happens three times. When the lights stop flashing, your headphones are reset.
Your Studios will automatically power on after a successful reset."
We hope this helps.
Cheers!