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Solid State Logic Alpha Channel

Brands: Solid State Logic
Brands
  • Transparent SSL mic preamp with 75 dB of gain and Hi-Z impedance switch
  • Built-in VHD (Variable Harmonic Drive) circuit—first featured on SSL’s flagship Duality console—adds level-dependent coloration from warm 2nd harmonics to aggressive 3rd harmonics
  • High-pass filter selectable at 40/80/120 Hz
  • 3-band EQ with mid-frequency Q control and selectable shelf/bell low-frequency mode

$1,900.00

Rackmount Analog Channel Strip with Built-In ADC

The Solid State Logic Alpha Channel is a rackmount analog channel strip offering a single channel of microphone preamplification, equalization, dynamics processing, and analog-to-digital conversion for singers, producers, and engineers in homes, studios, and live stage applications. With up to 75 dB of gain and Variable Harmonic Drive, the Alpha Channel can deliver anything from clean and smooth tones for soft vocals to ragged and gritty distortion for pounding drums. Its XLR-1/4″ combo jack accommodates mic-, line-, and instrument-level input signals.

Eliminate problematic rumble and proximity effect via the 40/80/120 Hz high-pass filter. Tonal sculpting is easily achieved with the Alpha Channel’s 3-band EQ—the LF band works in shelf or bell mode, the MF band has a variable Q control, and the HF band is a dedicated shelving curve. Connect your favorite outboard processor such as a compressor to the 1/4″ insert jacks, position it before or after the EQ at the push of a button, and even mix the dry send signal with the return.

Activate the intelligent auto limiter to avoid clipping through the integrated 24-bit / 192 kHz ADC, which sends digital signal to the S/PDIF output jack. A separate analog output is presented on a balanced 1/4″ TRS socket. The Alpha Channel also features adjustable output gain, a -20 dB pad, a polarity switch, and selectable 48V phantom power. The Alpha Channel occupies 1 RU of rack space and includes a detachable power cable.

FEATURES

  • Transparent SSL mic preamp with 75 dB of gain and Hi-Z impedance switch
  • Built-in VHD (Variable Harmonic Drive) circuit—first featured on SSL’s flagship Duality console—adds level-dependent coloration from warm 2nd harmonics to aggressive 3rd harmonics
  • High-pass filter selectable at 40/80/120 Hz
  • 3-band EQ with mid-frequency Q control and selectable shelf/bell low-frequency mode
  • Selectable intelligent auto limiting maximizes headroom and avoids ADC clipping
  • Front-panel XLR-1/4″ combo jack for mic, line, or instrument input
  • Auto-sensing 1/4″ Hi-Z input with passive DI-type impedance detection and level matching
  • Integrated 24-bit / 192 kHz ADC (analog-to-digital converter)
  • 1/4″ TRS analog output and S/PDIF digital output
  • Automatic sample rate synchronization to incoming digital signal
  • 6-segment LED output meter
  • 1/4″ insert send and return can be positioned before or after the EQ
  • Sum switch mixes the insert send with the insert return
  • Dedicated switches for polarity, -20 dB pad, and phantom power
  • Connect multiple Alpha Channels via DC sidechain link RCA jacks to achieve the same degree of limiting on the connected units
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Number of Channels 1
Inputs 1 x XLR-1/4″ combo (balanced/unbalanced)

1 x Coaxial S/PDIF
Outputs 1 x 1/4″ TRS (balanced)

1 x Coaxial S/PDIF
Inserts 1 x 1/4″ TRS send (balanced)

1 x 1/4″ TRS return (balanced)
Link Connectors 1 x RCA coaxial link input

1 x RCA coaxial link output
Input Impedance XLR Lo-Z: 1 kOhm

XLR Hi-Z: 10 kOhms

1/4″ Hi-Z: 1 MOhm

1/4″ Insert Return: 10 kOhms

S/PDIF: 75 Ohms
Output Impedance 1/4″ Output: 40 Ohms

1/4″ Insert Send: 40 Ohms

S/PDIF: 75 Ohms
Operating Level Limiter Switch Out: 24 dBu, unity gain to output

Limiter Switch In: 12 dBu, +12 dB gain to output
Maximum Output +24.3 dBu
Frequency Response 10 Hz to 70 kHz (± 0.2 dB)

6 Hz to 250 kHz (-3 dB)
Noise -130.5 dBu (10-Ohm mic input)

-127.5 dBu (150-Ohm mic input)
Dynamic Range 105 dB unweighted (minimum mic gain)

76 dB unweighted (maximum mic gain)
Common Mode Rejection: 70 dB from 50 Hz to 10 KHz with 1 Vp-p common mode

Maximum Input: 5 Vp-p
Specialties VHD (Variable Harmonic Drive)

-20 dB pad

Polarity switch

6-segment LED output meter

Preamp

Gain Range Input: +20 to +75 dB

Output: ±20 dB
Channel Gain Mic Gain to Output: 20 dB minimum, 76 dB maximum

Instrument Gain to Output: 26 dB minimum, 82 dB maximum
Distortion At +5 dBu: 0.03% (VHD at 0), 0.1% (VHD at 11)

At +10 dBu: 0.05% (VHD at 0), 0.3% (VHD at 11)

At +15 dBu: 0.06% (VHD at 0), 0.5% (VHD at 11)

At +20 dBu: 0.09% (VHD at 0), 2% (VHD at 11)

At +24 dBu: 0.15% (VHD at 0), 5% (VHD at 11)
Phantom Power 48 VDC, 47.5 VDC typical

Compressor

Threshold -3 dBFS
Ratio 6:1, over-easy
Headroom 12 dB minimum, 14 dB typical
Attack Time 50 µs
Release Time 200 ms
Distortion Limiting: 0.5% maximum

Non-Limiting: 0.001%

Equalizer

Filter Type High-pass filter at 40/80/120 Hz (-3 dB)
Frequency Bands LF: 40 to 600 Hz (shelf), 35 to 500 Hz (bell)

MF: 300 Hz to 5.2 kHz

HF: 1.5 to 22 kHz
Bandwidth LF Q: 1.4 (bell)

MF Q: 0.7 to 1.9

HF Q: N/A
Range (Boost/Cut) LF: ± 19 dB (shelf), ± 15 dB (bell)

MF: ± 17 dB

HF: ± 19 dB
Light Indication EQ in/out status

LF shelf/bell status
Dynamic Range 100 dBu

Converter

Type CS5361 ADC
Resolution 24-bit / 192 kHz
Sample Rates No S/PDIF Input: 44.1 kHz

S/PDIF Input: 32 to 108 kHz
S/PDIF Minimum Input: 200 mVp-p

Maximum Input: 5 Vp-p

Output: 1 Vp-p at 60 Ohms
Dynamic Range At 32 kHz: 110.5 dBA (20 kHz measurement bandwidth)

At 48 kHz: 110 dBA (20 kHz measurement bandwidth)

At 96 kHz: 109 dBA (20 kHz measurement bandwidth)
Distortion At -0.5 dBFS: 0.0006% (20 kHz measurement bandwidth)

At -10 dBFS: 0.0015% (20 kHz measurement bandwidth)

At -20 dBFS: 0.004% (20 kHz measurement bandwidth)

At -30 dBFS: 0.013% (20 kHz measurement bandwidth)

At -40 dBFS: 0.04% (20 kHz measurement bandwidth)
Frequency Response At 48 kHz: 20 Hz to 20 kHz (± 0.1 dB)

At 96 kHz: 20 Hz to 40 kHz (± 0.1 dB)
Output Gain ± 19.5 dB

Environmental

Operating Temperature 41 to 86°F / 5 to 30°C
Non-Operating Temperature -4 to 122°F / -20 to 50°C
Temperature Gradient (max) 59°F / 15°C per hour
Operating Humidity 20 to 80%
Non-Operating Humidity 5 to 90%
Max Wet Bulb 84°F / 29°C non-condensing
Operating Vibration < 0.2 G (3 to 100 Hz)
Non-Operating Vibration < 0.4 G (3 to 100 Hz), power off
Operating Shock < 2 G (10 ms maximum)
Non-Operating Shock < 10 G (10 ms maximum)
Operating Altitude 0 to 9842.5′ / 0 to 3000 m
Non-Operating Altitude 0 to 39,370.1′ / 0 to 12,000 m

Physical

Power Consumption < 20 W
Power Requirement 100 to 240 VAC, 50 to 60 Hz via IEC320 3-pin connector
Dimensions 19.0 x 9.1 x 1.8″ / 48.2 x 23.0 x 4.5 cm (including rack ears, casing only)

17.2 x 9.1 x 1.8″ / 43.8 x 23.0 x 4.5 cm (excluding rack ears, casing only)
Weight 7 lb / 3 kg

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