Tube-Tech SMC 2BM Mastering Multi-Band Compressor

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.

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 stabilized.

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 (off 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
Potentiometers with 31 detents for Threshold, Ratio, Attach, Release and Balance
Gain controls with 12 positions gold plated switches
Frequency switches with 6 positions gold plated switches
Clickless bypass relay

Input Impedance: 2k ohm
Output Impedance: 60 ohm
Frequency response @ -3 dB: 5 Hz to 60 kHz
Distortion THD+N @ 40 Hz: 0 dBu 0.15 %, +10 dBu 0.15 %
Noise Rg=200 ohm: 22 Hz-22 kHz; -70 dBu (Output Gain @ 0dB ), -60 dBu (Output Gain @ +10 dB): CCIR-468-4; -60 dBu (Output Gain @ 0dB), -50 dBu (Output Gain @ +10 dB)
Cross talk @ 10 kHz: -40 dB
CMRR @ 10 kHz: -60 dB
Max. output @ 1 % THD+N: > +26 dBu
Gain Output: of-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, 200, 300 Hz (x1); 0.24, o.4, 0.54, o.8, 1.0, 1.2 kHz (x4)
Mid & High band: 1.2, 2.0, o.3, 4.0, 4.8, 6.0  kHz  (x1)
Compressor Ratio: 1.5:1 to 10:1
Compressor Threshold: off to -20 dBu
Compressor Attack: 3 ms to 200 ms
Compressor Release: 60 ms to 2 s
Tubes: ECC 81 4 pc, ECC 82 2 pc. ECC 83 2 pc
Dimensions H x W x D: 5.2" x 19" x 8.1" (132 mm x 480 mm x 205 mm)
Weight: 13.7 lbs (6.2 kg)
Power requirements @ 115 V/230 V, 50-60 Hz: 30-45 W

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