Boulder 1151 Mono Power Amplifier

Boulder has the rare combination of technical and creative skills required to design this visually stunning and high-performance power amplifier.

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

Boulder has been providing this experience for over 40 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 1151 Mono Amplifiers enough power to rein in the most challenging loudspeakers in a manageable package is the best way to bring these recordings to life in your home.

The heritage of Boulder’s 40 years of experience in amplifier design is evident in every aspect of the Boulder 1151 Mono Power Amplifier. Don’t take our word for it, we encourage you to hear it for yourself.

• Continuous Power; 8, 4, 2 Ohms

  250W

• Peak Power, 8 Ohms

  350W

• Peak Power, 4 Ohms

  600W

• Peak Power, 2 Ohms

  750W

• THD, 8 Ohms, 250W

  0.002%, 20kHz 0.01%

• THD, 4 Ohms, 250W

  0.002%, 20kHz 0.01%

• THD, 2 Ohms, 250W

  0.003%, 20kHz 0.02%

• Equivalent Input Noise (EIN), 20 kHz, BW

  2.2 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: 65 dB

• 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

  10W standby, 60W idle, 800W at maximum output