This rolling case was made specifically for the subwoofer of the Evolve 30 and protects your PA from scratches, dings, and moisture damage during transport. Made with a durable nylon shell and interior padding, you won't have to worry about your sub's safety while it is in transport. On your way into the gig, strap the column array and pole to your back, grab your guitar with one hand, and roll the subwoofer behind you. No second trip is necessary! If you want your PA to be even more portable than before, it's time to buy the Electro-Voice Carrying Case.