Phono Preamplifier

Power. Finesse. Extended frequency response. Speed. Delicacy. Control. Spaciousness. Precise imaging. Rhythm. Dynamics. Involvement. Musicality. The list goes on. Selecting only a few of these traits and asking any audio product to achieve them is quite a daunting task. Looking at the list and then listening to the 1108 Phono Preamplifier, it immediately becomes apparent that it can do all of them. With ease.

For quite a lot of people, vinyl or phono playback was the first time they had heard of Boulder. The degree to which our phono preamplifiers pushed the limits of analog performance forward was shocking to many and it drew quite a lot of attention. Decades later the 1108 is doing it all over again. With ease.


  • Two pairs of balanced inputs for systems with more than one turntable, cartridge, or tonearm

  • Traditional RIAA equalization as well as EMI, FFRR (London/Decca), and Columbia EQ settings for LPs made before 1955

  • Low-cut filter to eliminate low frequency noise caused by turntable rumble or damaged LPs

  • Fully-balanced input circuitry to take advantage of a phono cartridge's naturally balanced output

  • Flexible resistive and capacitive cartridge loading and setup (MC and MM) via removable rear panel Personality Cards

  • Proprietary 985 gain stage is engineered specifically for the 1108 and encased in a housing machined from a solid block of aluminum

  • Gain settings of 70 dB (MC) and 44 dB (MM) enable use with virtually any phono cartridge

  • Interlocking casework damps vibration and shields the delicate analog phono signal inside

  • Two pairs of balanced outputs to connect preamplifiers and recording devices at the same time


Phono Preamplifier
  • Inputs

    2 pairs balanced,
    converts to unbalanced

  • Outputs

    2 pairs balanced,
    use as Main or Record

  • Input Impedance, Maximum

    MC: 1000 ohms
    MM: 47k ohms

  • 1 kHz Gain, RIAA

    MC: 70 dB
    MM: 44 dB

  • Frequency Response, RIAA

    ±0.10 dB,
    20 Hz to 20 kHz

  • Distortion, THD


  • Noise (EIN), MC

    98 nanovolts flat,
    20 Hz to 20 kHz

  • Maximum Output Level

    16 Vrms

  • Crosstalk, L to R or R to L

    -100 dB or better,
    20 Hz to 20 kHz

  • Weight

    37 lbs. (16.8 kg),
    Shipping: 51 lbs. (23.2 kg)

  • Power Requirements

    100-240 VAC, 50-60 Hz

  • Power Consumption