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Purple Audio Biz Mk (Demo Deal)

Three-amplifier, discrete mic preamp module

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Purple Audio
Included with your purchase:
  • Free Shipping (USA)
  • Free Tech Support
  • Free Extended Warranty

What is a Demo Deal Item?
In just about every case, a Demo Deal item is in nearly mint-condition but has be taken out of the box so a customer could take a look at it or try it for a few days. Because it is no longer factory-sealed, we offer it to you at a special price with full manufacturer’s warranty.

Regular Price: $775.00
Save 25%: -$193.75
Sale Price: $581.25

6-month financing with the Vintage King credit card

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Product Description
Additional Information
  • Product Description

    The Purple Audio Biz is a unique sounding, three amplifier, discrete microphone preamp module designed to work in standard “500” racks.

    The smooth Gain control helps you dial in the sound you want. If the output level is too high (the Class A/B output opamp can pump out up to +27 dBu), you can ride the level down with the separate Level control.

    Pressing the “Dual” switch splits the gain between two of our Class A opamps, enabling up to 75 dBu of clean gain, making the Biz a perfect match for ribbon microphones.

    With different Gain, Level, and Dual settings the Biz can produce an infinite variety of tonal variations with the same amount of output level. The front panel DI helps you record instruments and line level sources with unrivaled clarity and punch.

    Two LEDs clearly indicate signal level for the gain and output stages at a glance, turning green to indicate signal present, yellow for 10dB below clipping, and red for clipping. The Biz uses two KDJ3 opamps and one KDJ4 opamp.



    • Output level control
    • Input and output tricolor LED metering
    • Mic / Line switch for rack input Bridging line input for high output mics or line level sources Use with our Moiyn 8×2 mixer module in the Sweet Ten rack for mic or line mixing
    • DI Load switch for front panel input 33kohms as in the original Biz or 100kohms for a more open tone
    • Discrete signal path
    • Over Current Resettable Fused (prevents any module problem from affecting your rack)
    • ROHS – Lead Free



    • Maximum output level +27dBu
    • Frequency response 10hz – 70kHz +/- 1db (3db down at 100kHz)


    Transformer input:

    Mic mode

    • Maximum gain 60dB in single mode
    • Maximum gain 75dB in dual mode


    Line mode

    • Maximum gain 35dB in single mode
    • Maximum gain 50dB in dual mode


    Direct input:

    • Maximum gain 30dB in single mode
    • Maximum gain 40dB in dual mode
    • Beginning Serial Number 1600 February 2008:
    • Over Current Resettable Fused (prevents any module problem from affecting your rack)
    • ROHS – Lead Free
  • Additional Information

    Condition Demo Deal
    Channels Single-Channel
    Chassis 500 Series
    Module Slot Count 1 Slot
    Direct Input Yes
    Digital I/O No
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