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Buzz Audio essence

Discussion in '500 series' started by audiokid, Oct 22, 2011.

  1. audiokid

    audiokid Chris Staff Resource Member

    Mar 20, 2000
    Prince George, BC
    Home Page:
    TDThe BBuzz Audio EssenceB is a True Class A Optical Compressor designed to fit the API 500 VPR Series rack frames offering a great feature set in a compact package. The essence will find application with those seeking a musically transparent compressor for all tracking and mixing tasks, and it sounds particulary outstanding when processing voice and bass tracks. The essence - the Heart 'n' Soul of your next recording!

    The essence control circuit design is based on the Buzz Audio SOC-1.1 Stereo Optical Compressor but the main audio path utilises our BE40 and BE50 True Class A amplifiers along with high spec Lundahl* input and output transformers. The input transformer is directly coupled to the Buzz proprietary Opto gain reduction element (completely passive input), amplified and then balanced via the output transformer - a very simple but gutsy signal path!TD

    The essence control circuitry utilizes the Differential Drive Side Chain (DDSC) topology that was developed for the SOC-1.1. This system, which processes positive and negative audio waveform in seperate paths, provides the incredibly musical characteristic you will hear with this unit. The DDSC design also provides for a much faster attack time compared to most other LDR based optical compressors.

    Simple side chain equalizers have been provided to allow the user to adjust the sensitivity of the compressor at high and low frequencies. In addition, a side chain insert point is provided for more complex EQ and compressor "keying".

    The essence consumes 2 slots within a 500 Series rack. The inputoutput (IO) connectors associated with the first slot carry the main audio path. The IO connectors associated with the second slot are used for a side chain insert point (send and return). The insert can be switched inout of circuit and monitored via front panel switches.

    BStereo MatchingB
    We go to a lot of trouble to match up the LDR's used in our optical compressors but due to the inherent variances in these devices we now offer the essence in stereo matched pairs. Ask your dealer for more detail. For more information on linking two essence units, please read this.

    BRack CompatibilityB
    The essence power consumption of 120mA is higher than other 500 series modules, but because this demand is spread over two slots (60mA each) it should work fine in all available racks.
    h=3Buzz Audio essence's featureshTABLE
    TD="width: 100%"
    *API 500VPR Series rack module format - plug in and play!
    *Advanced analog technology - not a clone or copy of products from the past.
    *Powerful fully discrete hi-bias, wide bandwidth, differential Class A amplifiers.
    *Passive transformer coupled input, transformer coupled output
    *Side chain insert point
    *Side chain monitor selector
    *On board side chain EQ
    *Unique Differential Drive Side Chain design
    *May be linked to multiple essence units within one rack
    *Switchable 10 segment VU meter
    h=3Buzz Audio essence's specificationshBFrequency Response with no gain reductionB
    14Hz to 107kHz, +- 1.5dB
    BMaximum Input LevelB
    BMaximum Output LevelB
    BTotal Harmonic DistortionB
    IMeasured at 0dBu input, no gain reduction, make up Gain 0dBI
    100Hz = 0.1%
    1kHz = 0.015%
    10kHz = 0.002%
    IMeasured at +10dBu input, 20dB gain reduction, make up Gain +15dB, Attack AUTO, Release 16I
    100Hz = 0.1%
    1kHz = 0.015%
    10kHz = 0.005%
    BResidual NoiseB
    -95dB A wtg, 150ohm source Z, make up Gain 0dB
    BMake up Gain RangeB
    0dB to +15dB
    BMaximum Available Gain ReductionB
    BSC HI EQ BoostCutB
    8dB @ 10kHz
    BSC LO EQ BoostCutB
    8dB @ 100Hz
    BMain Audio Input ImpedanceB
    20k ohms, bal or unbal
    BMain Output ImpedanceB
    100 ohms bal or unbal
    BSidechain Send Output ImpedanceB
    100 ohms unbal
    BSidechain Return Input ImpedanceB
    44k ohms bal or unbal
    BSidechain Max InputOutput LevelsB
    (3"Wx5.25"H). Fits 2 spaces in API* 500VPR Series rack format
    BPower requirementsB
    120mA +- 15-18 volts DC, as supplied by rack power supply.

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