Tube Tech SMC2BM Multiband Mastering Optical Compressor


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  • The TUBE-TECH SMC 2BM Stereo Multiband Compressor features three independent optical stereo compressors. The signal is divided into three bands (Low, Mid & High) by 6 dB/octave x-over networks with 12 selectable frequencies: 60 – 1200 Hz for Low/Mid band and 6 selectable frequencies: 1,2 – 6,0 kHz for the Mid/High band. Switchable crossover points ensure precise control of all three bands of opto-compression. Independent band specific Threshold, Ratio, Attack, Release & Gain parameters make the SMC 2BM as flexible as it is accurate. Gain controls are fitted with 12 position gold plated switches with 1dB/step. Threshold, Ratio, Attack, Release and Balance controls are fitted with potentiometers with 31 detents.

    The design of the x-over networks optimizes the summing of all three bands, resulting in a flat frequency response (within +/-0,25 dB), when the gain controls for each band are set at the same level. The three compressors feature Threshold, Ratio, Attack, Release and Gain and a display showing gain reduction. Master levels are set with Output Gain and Balance controls. Both Input and Output are balanced and have fully floating transformers with a static screen. The power supply and the sidechain circuit is based on a solid state circuit. With the exception of the output stage all DC voltages are stabilised.


    • The world's only all tube based multiband compressor design
    • Three bands per channel with variable crossover frequencies between bands
    • Stereo sidechain with variable Threshold, Ratio, Attack, Release and Gain controls
    • for all three bands
    • Master Output Gain (-1 to +10 dB)
    • Balance Control (+/-1,5 dB)
    • LED display showing compression
    • Freq. response @ -3 dB: 5 Hz to 60 kHz
    • Low noise: < -60 dBu @10 dB gain
    • Conductive plastic potentiometers
    • Clickless bypass relay
  • Impedance
    Input 2 kOhm
    Output <60 ohm
    Frequency Response @ -3dB 5 Hz to 50 kHz
    Cross Talk @ 10kHz <-40 dB
    CMRR @ 10 kHz <-60 dB
    Master Off to +10 dB
    Low-, Mid-, High band Off to +10 dB
    Tracking Between Channels <0,5 dB
    Gain - Master Version (1 dB steps)
    Master -1 to +10 dB
    Low-, Mid-, High band -1 to +10 dB
    Tracking Between Channels <0,1 dB
    X-over Frequencies
    Low & Mid Band 60,100,150,200,250,300 Hz
    0.24, 0.4, 0.6, 0.8 1, 1,2 kHz
    Mid & High Band 1.2, 2, 3.2, 4, 6 kHz
    Ratio 1,5:1 to 10:1
    Threshold Off to -20 dBU
    Attack 3 ms to 200 ms
    Release 60 ms to 2s
    ECC 81 4 pc
    ECC 82 2 pc
    ECC 83 2 pc
    Height: 3 units 132 mm (5,2")

    483 mm (19,0")

    Depth: 205 mm (8,1")
    Net 6,2 kg 12,7 lbs)
    Shipping 7,5 kg (16,5 lbs)
    Power Requirements @ 115 V/230 V, 50-60 Hz 35-50 W
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