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HomepageMic Preamps500 Series Preamps › Purple Audio Biz Mk Mic Preamp
Purple Audio Biz Mk Mic Preamp

The Purple Audio Biz is a unique sounding, three amplifier, discrete microphone preamp module in 500 series.

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.
For example, employing the pair of Biz preamps with an Earthworks TC30K close mic'ing the shell of a snare and an Earthworks SR69 on the top head, I was able to add tremendous amounts of crunch to the attack (especially on rimshots) by turning up the Gain and turning down the Level. Conversely, I could soften the whack and bring out the tail (especially in the higher frequencies) by using low input gain followed by higher output gain. Admittedly, I wasn't able to dial in as much snap using the Biz as I could get from my BAE 312A preamp equipped with an Avedis 1122 opamp -- well, at least not straight out-of-the-box -- but I felt I had way more options with the Biz. Plus, by swapping out the Purple Audio KDJ3 opamps for Avedis 1122s, maybe I could Frankenstein the preamp into a hybrid somewhere in-between the out-of-box Biz and a BAE

Using a Royer SF-12 as a stereo overhead mic for drums, again the Biz was a little softer than the BAE. By hitting the Dual button, I could vary the amount of snare that pushed through, and playing with the Gain and Level knobs affected the tail of the snare and high hat. As a bass DI, the Biz had a wonderful way of mellowing out the performance, as if it were lightly compressing and controlling the upper mids while still letting through plenty of airy top -- no nasty bite here. And the Dual button added a bit of up-front presence. On vocal, I liked how I could soften the sibilance or add graininess on command. With careful tweaking of the front-panel controls, I was able to record some amazingly smooth female vocals using a Royer R-121 feeding the Biz (with lots of gain available) as well as some aggressive male vocals using a Groove Tubes GT50 FET.

Recording electric guitar is where the Biz really excelled. Using a variety of mics (AKG C 1000S, Groove Tubes GT30 & GT40, Gefell M300 & UMT70S, Royer R-121, SE Electronics SE3) on a variety of amps/cabinets, I never felt like I had to swap out preamps. Instead, I could vary the amounts of two different flavors of crunch by turning up the Gain and Level knobs, and I could bring the upper mids forward by engaging the Dual switch. Also, during a preamp shootout between the Biz and preamps from API, BAE, A-Designs, Seventh Circle Audio, Great River, Focusrite, and Hamptone, the Biz drew out the glassiest sustain from a GT40 medium-diaphragm tube mic on a Mesa Rocket 44 amp; the tone was just gorgeous.

If you're going to start with one 500-series preamp (or pair), the Biz would top my list of recommendations. It sounds as good as any high-end preamp should, but compared to other modular preamps, the Biz's chameleon-like tonal flexibility makes it much more valuable for multitrack recording. Its build-quality is impeccable as are the reputations of Purple's Andrew Roberts and John Klett as designers and techs. And if you feel like tweaking the sound of the Biz further, each of its three opamp sockets will hold any standard discrete opamp, but there's also a DIP socket underneath each to accept any standard IC opamp instead!
  • 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 8x2 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)
  • Specifications
    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
    Price *
    Free shipping in Canada. Conditions
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    Additional information
    For more information about the Biz Mk Mic Preamp, please visit the website of Purple Audio
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