The Yamaha Microphone Stand Adapter For S15 mounts loudspeakers of up to 11 pounds to a microphone stand. The BMS10A fits the 5/8", 27-thread standard and comes with a 3/8" 16-thread European adapter. The BMS10A comes with two 5mm screws needed for mounting.
The BMS10A also mounts MG10/2, MG8/2FX, and STAGEPAS mixers on mic stands. BMS10A is sold as a single unit.