Boulder 866 Integrated Streaming Amplifier

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 Specifications
Balanced Analog Inputs 3, via 3-pin XLR
Digital Inputs Ethernet, 4 x USB, AES3, Toslink
(Optical), wireless, WiFi (network)
Loudspeaker Outputs 0.25” (6 mm) binding posts
Continuous Power, 8 ohms 200W
Peak Power, 8 ohms 250W
Continuous Power, 4 ohms 400W
Peak Power, 4 ohms 400W
Peak Power, 2 ohms 700W
Distortion, THD 0.01%
Equivalent Input Noise (EIN), 20 kHz 2 µV
Input Impedance 100kΩ, Balanced
Maximum Analog Gain 40.4 dB
Frequency Response, 20 Hz – 20 kHz 0.00, -0.04 dB
Frequency Response, -3 dB 0.015, 150 kHz
Power Requirements 100, 120, 240 VAC, 50-60Hz
Power Consumption 1000W Maximum
Preamplifier Chassis Dimensions 17” W x 15.4” D x 7.25” H
45 cm W x 39 cm D x 19 cm H
Amplifier Chassis Weight 54 lbs. (24.5 kg)
Shipping Dimensions 24” W x 23” D x 16” H
61 cm W x 59 cm D x 41 cm H
Shipping Weight 64 lbs. (29 kg)