This is the Amp Silo! This simple yet thoughtful design works a treat! The Amp silo is designed to stop the blizzard of nails while also being its own microphone stand. The SILO is a light, portable, adjustable baffle (or sound 'blocking/attenuating' device) that can help smooth out certain harsh frequencies that emanate from the center of a guitar speaker. Even the very best guitar speakers have this phenomenon, and the SILO is the cure.