Not only does it sound better, but it's more powerful, stylish and affordable than its predecessor, and with the option to add a DAC, this is a real winner.

What Hi-Fi?

Two versions are available to suit any system: all-analog for more traditional systems and analog+digital for the streaming digital media listener.

  • INPUTS: 3 pairs balanced analog via 3-pin XLR
  • DIGITAL INPUTS: Ethernet, USB x 4, AES3 (adaptable to S/PDIF), Toslink (optical), WiFi
  • OUTPUTS: 0.25" (6 mm) binding posts
  • CONTINUOUS POWER, 8 OHMS: 200W
  • PEAK POWER, 8 OHMS: 250W
  • CONTINUOUS POWER, 4 OHMS: 400W
  • PEAK POWER, 4 OHMS: 400W
  • PEAK POWER, 2 OHMS: 700W
  • DISTORTION, THD: 0.01%
  • EQUIVALENT INPUT NOISE (EIN), 20 KHZ: 2 μV
  • INPUT IMPEDANCE: 100k ohms, balanced
  • MAXIMUM ANALOG GAIN: 40.4 dB
  • FREQUENCY RESPONSE, 20-20 KHZ: 0.00, -0.04 dB
  • FREQUENCY RESPONSE, -3 DB: 0.015 Hz, 150 kHz
  • POWER REQUIREMENTS: 100V, 120V, 240V, 50-60 Hz
  • POWER CONSUMPTION: 1000W maximum
  • DIMENSIONS: 17" W x 15.4 D x 7.25" H
    (44 cm W x 39 cm D x 19 cm H)
  • WEIGHT54 lbs.
    (24.5 kg)
  • SHIPPING DIMENSIONS24" W x 23" D x 14" H
    (61 cm H x 59 cm D x 36 cm H)

The sound. What can I tell you about the sound? It’s not great. By which I mean that it’s excellent… extraordinarily good, in fact. So exceptionally good that you won’t have to spend hours in lengthy listening sessions, auditioning track after track after track in order to establish its quality: you’ll know in the first few instants that you’re listening to a remarkable amplifier. For starters, the 866’s control over bass is exceptional. If you thought your speakers delivered tight, taut and rhythmic bass, you won’t really have heard them until you’ve connected them to Boulder’s 866. The tonal quality, the depth of the bass, the perfect pacing of bass lines, the dynamism revealed by the sound from a close-miked drum kit… the Boulder 866 has it all in spades. No, it’s better than just spades, it’s a full lay-down misère.