Yamaha DXS18XLF 18 Active PA Subwoofer

I'll find out more after a jam session, but it seems to do the job for now.

For the cost of these wheels, I expected to at least have brakes. These wheels are nice and quiet and roll really well - so well that they will roll without a push on the slightest grade. Yamaha should have offered wheels with brakes so you don't have set them on their feet for storage, which makes it difficult to pack them tightly.