Boulder 861 Stereo Power Amplifier

75W peak power per channel into 8 ohms, 110W peak power into 4 ohms, 200W peak power into 2 ohms

New protection circuitry enables the 861 to deliver greater current at maximum output without fear of damage to the amplifier's electronics

Space-saving design is the same footprint (width and depth) as the 812 DAC Preamplifier

In-house manufacturing efficiency improvements have made the 861 an incredible value in comparison to previous amplifiers

Smaller carton packaging means easier transportation, unpacking, and installation

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 in-house 0.25" (6 mm) thumbscrew binding posts are included for secure speaker cable connections and optimal sound quality

IP control, and networked HTML page

Software updates to the internal control and housekeeping systems are available as needed with automated online downloads or manual USB port installation

Specifications

Continuous Power, 8 Ohms- 50W

Peak Power, 8 Ohms- 75W

Continuous Power, 4 Ohms- 90W

Peak Power, 4 Ohms- 110W

Peak Power, 2 Ohms- 200W

Balanced Analog Inputs- 1 pair balanced via 3-pin XLR

Outputs- .25" (6mm) Binding posts

Distortion, THD- 0.01%

Equivalent Input Noise (EIN), 20 KHz- 2.6 μV

Input Impedance- 100kΩ Balanced

Frequency Response, 20 Hz to 20 KHz- +0.00, -0.04 dB

Frequency Response, -3 dB- 0.015 Hz, 150 kHz

Maximum Analog Gain- 26 dB

Power Requirements- 100V, 120V, 240V, 50-60 Hz

Power Consumption- 550W Maximum

Dimensions- 12"x12"x3.5"

Weight- 22 lbs