Boulder 866 Integrated

Boulder 866 Integrated

For over 35 years, Boulder has been building the world’s highest quality audio components near Boulder, Colorado.  Boulders are cherished by music and film lovers all over the world and are instilled with quality and value that transcend the passage of time.



How do you follow up one of the most successful products in the history of a company? With a product that improves upon the original in every way, and the Boulder 866 Integrated does just that.

Power is up to 200W per channel. Manufacturing is substantially more efficient. Weight has been reduced. New circuitry gives you greater current output at maximum power. External IP control has been added. There are versions for traditional systems as well as modern streaming media users. And a dedicated Boulder app easily enables you to manage everything.

And here’s the best part: the sound is everything you would expect from a Boulder. It’s powerful, clean, clear, quick, and true to the sound of the original recording and the intents of the artists involved. In fact, there’s absolutely no reason not to take home an 866. It’s everything you could want and more.


Boulder 866 Integrated Amplifier


Main Highlights


  • Two versions are available to suit any system: all-analog for more traditional systems and analog+digital for the streaming digital media listener
  • Excellent power, dynamics, and control from 200W of amplifier power into any loudspeaker load
  • A full-color touch screen displays all of the available inputs and setup features in addition to the amplifier’s status and setup modes
  • A dedicated Boulder app controls the 866 and makes custom setup adjustments, including adding photos of your sources to the inputs shown on the 866’s front panel, optional RF remote for volume control and switching inputs also available
  • In-house manufacturing efficiency improvements have made the 866 an incredible value in comparison to previous integrated amplifiers
  • New protection circuitry enables the 866 to deliver greater current at maximum output without fear of damage to the amplifier’s electronics
  • The analog+digital version of the 866 adds digital inputs for USB, Ethernet, AES3, Toslink, plus Roon integration
  • Along with assembly and testing, every circuit board and piece of metalwork is produced in-house at Boulder’s dedicated facility for unparalleled quality assurance
  • Boulder’s traditional 0.25″ (6 mm) thumbscrew binding posts are included for secure speaker cable connections and optimal sound quality


Technical Specification


INPUTS 3 pairs balanced analog via 3-pin XLR
DIGITAL INPUTS Ethernet, USB x 4, AES3 (adaptable to S/PDIF), Toslink (optical), WiFi
OUTPUTS 0.25″ (6 mm) binding posts
CONTINUOUS POWER, 8 OHMS 200W per channel
PEAK POWER, 8 OHMS 250W per channel
CONTINUOUS POWER, 4 OHMS 400W per channel
PEAK POWER, 4 OHMS 400W per channel
PEAK POWER, 2 OHMS 700W per channel
INPUT IMPEDANCE 100k ohms, balanced
FREQUENCY RESPONSE, 20-20 KHZ 0.00, -0.04 dB
FREQUENCY RESPONSE, -3 DB 0.015 Hz, 150 kHz
POWER REQUIREMENTS 100V, 120V, 240V, 50-60 Hz
DIMENSIONS 44 cm W x 39 cm D x 19 cm H
WEIGHT 24.5 kg



Boulder 866 Brochure

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