Here is a quality, adjustable loudspeaker pole from Electro-Voice with M20 thread for use with EKX and ETX subwoofers.
Features:
- M20 thread on bottom designed to go specifically with subwoofer pole cup
- Designed to custom-fit ETX and EKX subwoofers as well as any subwoofers with M20 threaded mounting plate
- Adjustable to 1.480 mm