Boulder 861 Stereo Power Amplifier

Boulder 861 Stereo Power Amplifier

There is a solution for those in smaller living spaces, for those that have efficient systems, or for those who like the 866 Integrated sonically but prefer separates. The 861 Stereo Power Amplifier checks all these boxes. The 861 being the newest expansion of the 800 series is the same exact size as the 812 DAC Preamplifier it makes for an attractive combo both visually and audibly. All the boards and chassis are still made in Boulder’s dedicated facility in Colorado. You get the high performance, the expertise and craftsmanship in a manageable package.

The 861 is Boulders first amplifier in its size and it punches well above its weight class. Don’t believe us? You should really listen for yourself.

Features:

• 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 available as needed with automated online downloads or manual USB port installation

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  CONTINUOUS POWER; 8, 4, 2 OHMS

  150w

  PEAK POWER, 8 OHMS

  200W

  PEAK POWER, 4 OHMS

  350W

  PEAK POWER, 2 OHMS

  450W

  THD, 8 OHMS, 150W

  0.003%, 20 kHz: 0.01%

  THD, 4 OHMS, 150W

  0.004%, 20 kHz: 0.015%

  THD, 2 OHMS, 150W

  0.005%, 20 kHz: 0.025%

  EQUIVALENT INPUT NOISE (EIN), 20 KHZ, BW

  1.5 μV

  MAGNITUDE RESPONSE, 20 HZ TO 20 KHZ

  +0.00, -0.04 dB

  MAGNITUDE RESPONSE, -3 DB AT

  0.015 Hz, 150 kHz

  VOLTAGE GAIN

  26 dB

  INPUT IMPEDANCE

  Balanced: 200k ohms,
  Unbalanced: 100k ohms

  COMMON MODE REJECTION (BALANCED ONLY)

  60 Hz: 90 dB, 10 kHz: 70 dB

  CROSSTALK, L TO R OR R TO L

  -100 dB or better, 20 Hz to
  20 kHz

  INPUT CONNECTORS

  3-pin balanced XLR

  OUTPUT CONNECTORS

  Two sets of 6 mm / .250-inch wingscrews

  WEIGHT

  Amplifier: 54 lbs. (24.5 kg)
  Shipping: 64 lbs. (29.0 kg)

  POWER REQUIREMENTS

  100, 110-120, 220-240 VAC, 50-60 Hz

  POWER CONSUMPTION

  15W standby, 100W nominal, 1000W at maximum output