Alpha ChannelSuperior SSL front end for your DAW.

Specifications

Front

Stereo Compressor

 

Rear

Stereo Compressor

 
Physical *
Depth 230mm / 9" casing only
Height 44.5mm / 1.75" (1 RU)
Width 438mm / 17.25" casing only
  482mm / 19" inc’ rack ears
Weight 3.0kg / 7 pounds
Power < 20 Watts
Boxed size 320mm x 550mm x 80mm
  12.75" x 21.75" x 3.25"
Boxed weight 3.5kg / 8 pounds
 
* All values are approximate
Connections
Power IEC320 3-pin connector, 100 – 240 Vac, 50 – 60 Hz
Analogue I/O
Microphone Balanced, 3-pin XLR-F, Zin = 1kΩ (10kΩ for Hi Z)
Instrument Un-balanced, ¼" Mono Jack, Zin = 1MΩ
Output Balanced, ¼" Stereo Jack, Zo = 40Ω
Insert Send Balanced, ¼" Stereo Jack, Zo = 40Ω
Insert Return Balanced, ¼" Stereo Jack, Zin = 10kΩ
Link (2 of) RCA phono, limiter sidechain control voltage (dc.)
Digital I/O
SPDIF In RCA phono, 1V pk-pk, Zin = 75Ω, SPDIF format.
  The ADC will lock to this signal if present.
SPDIF Out RCA phono, 1V pk-pk, Zo = 75Ω, SPDIF 24bit format.
  Synchronised to SPDIF In, else free-runs at 44.1kHz.
Measured Performance
Mic Gain To Output: 20dB min, 76 dB max
Instrument Gain To Output: 26dB min, 82 dB max
Pad Attenuation: 20 dB
Input Impedance (Ω):
  Mic: 1K / 10K
  Instrument: 1 MEG
Noise Figure
  Equivalent Ein:  
  Mic, Zin = 10R -130.5 dBU
  Mic, Zin =150R -127.5 dBU
Dynamic Range:
  Mic Gain Min: 105 dB unweighted
  Mic Gain Max: 76 dB unweighted
Common Mode Rejection: 70 dB from 50Hz to 10KHz
    with 1Vp-p Common Mode
Max Common Mode In: 5V p-p
Frequency Response
  Mic To Out: +/- 0.2 dB from 10Hz to 70KHz
  -3dB (LF) : 6 Hz
  -3dB (HF) : 250 KHz
Mic Amp Distortion - A Typical Specification
Output Level THD Knob CCW THD Knob CW
+5 dBU 0.03 % 0.1 %
+10 dBU 0.05 % 0.3 %
+15 dBU 0.06 % 0.5 %
+20 dBU 0.09 % 2 %
+24 dBU 0.15 % 5 %
Maximum Analog Output: +24.3 dBU (10K)
EQ
LF Section:
  LF Shelf Gain Range: +/- 19 dB
  LF Bell Gain Range: +/- 15 dB
  Shelf Freq Range: 40 - 600 Hz
  Bell Freq Range: 35 - 500 Hz
  Bell Q: 1.4
Mid Section:
  Gain Range: +/- 17 dB
  Freq Range: 300 - 5200 Hz
  Q Range: 0.7 - 1.9
HF Section:
  Shelf Gain Range: +/- 19 dB
  Shelf Freq Range: 1.5KHz - 22 KHz
EQ Dynamic Range: 100 dBU
Limiter
Limiter Threshold: - 3 dBFS
Limiter Ratio: 6, over-easy
Limiter Headroom: 12 dB min, 14 dB typ
Attack Time: 50 uSec
Release Time: 200 mSec
Limiting Distortion: 0.5 % max
Non-Limiting Distortion: 0.001 %
 
Insert Point
Operating Level
  Limiter Switch Out: 24 dBU, unity gain to output
  Limiter Switch In: 12 dBU, +12 dB gain to output
Output Impedance (SEND): 150 Ω
Input Impedance (RETURN): 10 KΩ
ADC
ADC Type: 24 bit, 192 KHz CS5361 ADC
Sampling Rate: locks to user supplied SPDIF IN
  Range: 32 KHz to 108 KHz
  No SPDIF In: Defaults to 44.100 KHz
SPDIF In: 200 mV p-p IN min
  5V p-p IN max
SPDIF Out (Level): 1V p-p
  (Impedance): 60 Ω
   
ADC Performance Measured From Insert Return:
Dynamic Range, 20KHz measurement bandwidth
  Fs= 32K: 110.5 dB, A-wgt
  Fs= 48K: 110 dB, A-wgt
  Fs= 96K: 109 dB, A-wgt
ADC Distortion, 1KHz test tone
  Level Distortion in 20K meas bw
  -0.5 dBFS 0.0006 %
  -10 dBFS 0.0015 %
  -20 dBFS 0.004 %
  -30 dBFS 0.013 %
  -40 dBFS 0.04 %
ADC Freq Response
  Fs = 48 K: +/- 0.1 dB, 20Hz - 20KHz
  Fs = 96 K: +/- 0.1 dB, 20Hz - 40KHz
 
Miscellaneous
Phantom Power: 47.5V typical
Output Gain Range: +/- 19.5 dB