The Eich TB250 is a specialized micro sub-bass amplifier head designed to power tactile monitoring systems such as the BassBoard or DBC400R drum throne. It utilizes a Class D power amplifier circuit to deliver clean, high-output power to low-frequency transducers, allowing musicians to feel the physical "thump" of their instrument without high stage volumes. The solid-state preamp features a variable sub-frequency filter adjustable between 40 Hz and 300 Hz and a toggle switch to select between flat response or the filtered sub signal. Connectivity includes a Neutrik XLR/jack combo input and a professional Speaker Twist output. Its ultra-compact chassis is designed for portability and can be mounted directly to stools or pedalboards using optional clips.