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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

Boulder 850 Mono Power Amplifier

Color: Silver
  • NEW
    Warranty 5 years
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