Yes, you can Double Up with a BOOM or a MEGABOOM. If you’re doubling up with a BOOM, make sure your BOOM has the latest BOOM software. BOOM update version 7.x and 8.x all of for compatibility with ROLL, but versions 5.x and 6.x do not.
MEGABOOM already has this feature out of the box.
Your ROLL, MEGABOOM, and BOOM Double Up in the same way as they would with the same type of speaker.