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