Boulder 1151 Mono Power Amplifier

The Boulder 1151 Mono Power Amplifier synthesizes four decades of amplifier design expertise with contemporary engineering to deliver commanding control over demanding loudspeakers. Boulder's legacy spans professional recording studios and broadcast facilities worldwide, establishing a foundation of uncompromising audio reproduction standards. The 1151 provides the substantial power reserves necessary for realistic playback levels while maintaining absolute speaker control—the hallmark of transparent, engaging listening. This monoblock design distills Boulder's accumulated knowledge into a visually refined package engineered to unlock the full potential of premium loudspeaker systems. Whether reproducing challenging impedance loads or revealing subtle recording details, the 1151 demonstrates the technical precision and creative design philosophy that has defined Boulder amplifiers for over 40 years. Experience the difference that heritage-informed engineering brings to your audio system.

• 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