Upon its release, the 850 Mono Amplifier was the beginning of a new chapter in Boulder’s storied history: the first amplifier in the 800 Series, from the company whose products have captured and monitored some of the most important music and film scores of all time.
 
Powerful 200W output from a surprisingly compact chassis
Unique half-width casework allows for installation in both audio and home cinema systems
Rugged, easy-to-connect, high-current speaker terminals require no tools
Advanced microprocessor-controlled protection circuits for trouble-free operation
Proper use of feedback to maximize bandwidth and minimize distortion without affecting sound quality
Programmable Boulder Link to turn on multiple 850s and transmit their status to any Boulder preamplifier's display
Large toroidal transformer is encased in a steel housing, potted, and damped to eliminate vibration or hum
Multiple filter capacitors assure a fast, low-impedance power supply
Supervising microprocessor oversees all functions and communicates with other Boulders during turn-on and turn-off