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AnaMod AM670 Stereo Limiter

Discussion in 'Dual Compressors' started by audiokid, Oct 25, 2011.

  1. audiokid

    audiokid Staff

    ATTACH1302.vBATTACH

    The BAnamod AM670B is a faithful recreation of the classic sound and compression profile of the Fairchild 670, using the AnaMod process to model the complex tube circuitry of the 670 and implement it entirely in the analog domain. Unlike a digital plug-in or processorbased outboard gear, there is no latency, and no AD or DA conversions to compromise the sound. All the functions of the original 670 have been condensed into three rack spaces.

    Like the Fairchild 670, the AM670 has LeftRight (dual mono), and LatVert (M-S encodedecode) modes of dynamics processing. In addition, AM670 also has a Stereo mode, which links sidechains of the two channels.

    The Fairchild 670 limiter is arguably one of the most famous and sought-after stereo compressors ever made. The magical way it adds density and dimension to a track or a mix has been demonstrated on many of the best-sounding records made in the last 50 years. For bus compression, the 670 Limiter is the standard by which all others are judged.
    h=3AnaMod AM670 Stereo Limiter's featureshTABLE
    TR
    TD="width: 100%"
    LIST
    *Classic Variable-Mu compression profile and vintage tone
    *Six 670 time constants plus two vocal- friendly variations
    *Three Modes of Compression
    *All analog - no latency or conversion
    *Standard 3U rack format
    LIST

    h=3AnaMod AM670 Stereo Limiter's specificationshInput Impedance: 20KOhms, balanced
    Output Impedance: less than 50 Ohms
    Max. Output Level: +22dBu, balanced
    Input Gain: -15 to +15 dB
    Frequency Response: +- 1 dB from 40Hz to 15kHz
    Noise Level: better than 73dB below +4dBu, 0-30kHz
    Limiting Noises: same level as a vintage 660 with GE five star 6386 tubes and properly balanced
    Total Harmonic Distortion: level- and compression-dependent
    Compression Ratio: Variable from 1: 1 to 20:1, level-dependent

    BAutomatic Gain Control (AGC) ModesB

    LeftRight: Dual Mono (split) operation
    Stereo: Left and Right channels are linked
    LatVert: Left and Right channels are Mid-Side (M-S) encoded, compressed separately, and decoded back to LeftRight

    BTime ConstantsB

    1-6 are the classic 670 time constants
    2a and 2b are variations on #2


    BPositionB
    BAttack TimeB
    BRelease TimeB


    1
    0.2ms
    0.3s


    2
    0.2ms
    0.8s


    2a
    0.2ms
    1s


    2b
    0.2ms
    2s


    3
    0.4ms
    2s


    4
    0.8ms
    5s


    5
    0.4ms
    Auto, as in 670 #5


    6
    0.2ms
    Auto, as in 670 #6
    TD
    TR
    TABLE
     

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