860

Stereo Power Amplifier

All parts of the 860 Stereo Amplifier, every piece of metal, every circuit, is created and assembled in-house by our own craftsmen and technicians. Boulder is the last high-performance audio manufacturer in North America to proudly hold this degree of quality control over our own designs.

Features

  • Programmable Boulder Link to turn on multiple 850s and transmit their status to any Boulder preamplifier's display

  • Supervising microprocessor oversees all functions and communicates with Boulder preamplifiers

  • Two stage design provides most of the gain in the first stage, thus maximizing bandwidth

  • Advanced protection circuits for trouble-free operation

  • Precision surface mount circuit boards minimize connection resistance and inductance

  • Rugged, easy-to-connect, high-current speaker terminals require no tools

  • 16 output transistors provide stable operation with practically any loudspeaker

  • Potted and magnetically shielded power transformer for quiet operation

  • Multiple filter capacitors assure a low impedance, distributed power supply

Specs

860
Stereo Power Amplifier
  • Continuous Output Power, 8 / 4 ohms

    150W

  • Peak Output Power, 4 ohms

    300W

  • Loudspeaker Output Connectors

    1 pair per channel, 6 mm/.250-inch wingscrews

  • Input Connectors

    Balanced via 3-pin XLR

  • THD & Noise, Continuous Power

    20 Hz to 2 kHz: 0.0035%,
    20 kHz: 0.018%

  • 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

  • Signal-to-Noise Ratio (re: 150W/8 ohms)

    -108 dB, unweighted,
    20 Hz to 22 kHz

  • Input Impedance

    Balanced: 50 kΩ, unbalanced: 26 kΩ

  • Common Mode Rejection (Balanced Only)

    60 Hz: 90 dB, 10 kHz: 70 dB

  • Crosstalk, L to R or R to L

    Greater than 112 dB

  • Weight

    Amplifier: 45 lbs. (20.4 kg)
    Shipping: 56 lbs. (25.4 kg)

  • Power Requirements

    100, 120, 220-240 VAC, 50-60 Hz
    3W Standby, 850W maximum