Black Lion Audio B12A MKII 500


This 312 style mic pre / DI is ready to fill a single slot of your API 500 series rack!

The B12A MkII 500 packs the same punch as its ½ rack cousin, but in the convenient and flexible 500 series format. The API-style design features a delicious CineMag input transformer, serves up huge portions of low-noise gain, and has the same classic American rock sound that the original API 312A is known for! Get ready to fill your lunchbox, ‘cause once you go Black Lion Audio, you never go back!


  • 500 Series format (lunchbox required)
  • Cinemag Input Transformer
  • Edcor Output Transformer
  • 70dB Gain
  • Hi-Z Input (passive, unbalanced)
  • Phantom Power
  • 18dB Pad
  • Phase Switch


  • Mic Section
    Max Microphone Input Level: +1dBu
    Input Impedance: 200Ω
    Pad: 18dBu
    Gain (no pad): +26dB to +70dB • Equivalent Input Noise (noise floor): 120dB
  • THD+N:
    .01% @ +26dB Gain
    .011% @ +40dB Gain
    .049% @ +60dB Gain
    .15% @ +70dB Gain
  • Bandwidth (1kHz, 150Ω source, unweighted): 10Hz to 30kHz D.I. Section
  • Max D.I. Input Level: +18dBu
  • Input Impedance: 500kΩ
  • Pad: none
  • Gain: +10dB to +53dB
  • Equivalent Input Noise (noise floor): -94dB
  • THD+N:
    .008% @ +10dB Gain
    .01% @ +25dB Gain • .03% @ +40dB Gain
    .15% @ +53dB Gain
  • Bandwidth (1kHz, 600Ω unbalanced source, unweighted): 10Hz to 30kHz
  • Output Section
    Max Output Level: +28dBu
    Output Impedance: 600Ω
  • Power Supply: +/- 15v (lunchbox supply)
  • Product Dimensions: 1 .5” x 6.5” x 5.25”
  • Product Weight: .8 lbs
  • Shipping Dimensions: 13” x 11” x 5”
  • Shipping Weight: 1.8 lbs
Our ONE WITH EVERYTHING ZEN WARRANTY extends the standard manufacturer warranty by one year, see our ZEN WARRANTY page for details.

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