On-Stage SSA21 Subwoofer Adapter

Use this adapter to make sure any poles will fit on your subwoofer. The SSA21's female M20 threading easily and securely attaches to M20 speaker shafts.

The On-Stage SSA21 Subwoofer Adapter's female M20 threading attaches to M20 speaker shafts to accommodate virtually any subwoofer on the market, utilizing both removable M20 threading and a tapered, zinc-lugged lower section to accept 1" cups. Whether it is a shallow M20, recessed M20, 1 3/8 cup or 1 3/8" cup with M20, the SSA21 will fit your subwoofer.


- Application: Subwoofer adapter with removable M20
- Upper Adapter: Accepts male M20
- Weight Capacity: 100 lbs.
- Lower Adapter: Tapered to 1 3/8" with removable M20 to fit all subwoofers on the market
- Includes: Allen key for M20 lug removal
- Construction: Steel

Dimensions and Weight in Packaging
Base Item
Shipping Weight: 1 lbs
Shipping Dimensions: 9 x 2 x 2 in
Manufacturer Part Number (MPN): SSA21

For support or warranty questions, please contact the manufacturer:
Phone: 800-289-8889