Mono Power Amplifier

Modern loudspeakers demand high-powered amplifiers to play at realistic levels. Even at moderate volumes, absolute control of the speaker is what makes you stop and listen.

Boulder has been providing this experience for over 30 years. Our history includes amplifiers that were used when capturing some of the greatest recordings ever made, so we know a thing or two about flawless audio reproduction. We also know that giving the 1050 Mono Amplifiers enough power to rein in the most challenging loudspeakers is the best way to bring these recordings to life in your home.


  • Enormous 500W output means exceptional grip and control of loudspeakers

  • 56 output transistors for stable operation and excellent power delivery

  • Dual transformer design is filtered, potted, and enclosed in a welded steel case to eliminate noise or hum

  • Boulder Link control system to integrate multiple 1050s with other Boulder products

  • Modern chassis design is completely machined from solid blocks of aluminum and shows no screws or fasteners

  • Boulder's 983 gain stages combine discrete and monolithic parts for excellent clarity and current drive

  • Complete microprocessor control of power up, protection circuits and Boulder Link

  • Two pairs of sturdy, durable speaker binding posts require no tools to make secure connections

  • Massive 32A power cord connector means ample power delivery to the amplifier when necessary


Mono Power Amplifier
  • Continuous Power, 8 ohms

    500W / 8,4,2 ohms

  • Peak Power, 8 ohms


  • Peak Power, 4 ohms


  • Peak Power, 2 ohms


  • THD at Continuous Power

    20 to 2 kHz: .001%, 20 kHz: .005%

  • Magnitude Response, 20 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: 500W/8Ω)

    129 dB, Unweighted 20 to 22 kHz

  • Input Impedance

    Balanced : 100k ohms,
    Unbalanced: 50k ohms

  • Common Mode Rejection (Balanced Only)

    60 Hz: 90 dB, 10 kHz: 70 dB

  • Crosstalk, L to R or R to L

    Greater than 120 dB

  • Inputs Connectors

    3-pin balanced XLR

  • Output Connectors

    2 sets of 6 mm / .250-inch wingscrews

  • Weight

    Amplifier: 140 lbs. (63.5 kg),
    Shipping: 220 lbs. (99.8 kg)

  • Power Requirements

    100, 120, 200, 220-240 VAC, 50-60 Hz

  • Power Consumption

    240W nominal, 3000 W maximum