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AD2044 Dual Mono Stereo Opto Compressor

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Item: N13-Avalon-AD2044

Availability: In stock

AD2044 Dual Mono Stereo Opto Compressor
AD2044 Dual Mono Stereo Opto Compressor AD2044 Dual Mono Stereo Opto Compressor


The AD2044 Pure Class A opto-compressor is a super transparent, low noise, dual channel optical-compressor. Designed to optimize absolute signal integrity and musical performance, the AD2044 is a perfect solution for two-buss music-program compression and mastering applications.

Custom manufactured, high-speed linear opto elements provide the non-invasive passive attenuator system for transparent gain reduction. The AD2044 incorporates an external control loop and current monitored optical driver for smooth control, plus the benefits of traditional vintage LDR compression.

The opto elements enable the AD2044 to deliver totally transparent, low noise, gain reduction within the minimalist signal path design. No VCAs are incorporated. Variable attack and release controls, plus side chain access, provide unlimited creative control from soft compression to hard limiting. Avalon's advanced true symmetry design offers high-voltage, large headroom, extended bandwidth and very low noise. The use of 100% discrete, Pure Class A signal amplifiers offer the serious music professional unlimited sonic character and a natural harmonic detail.


  • Two channels of transparent, non-invasive compression
  • Minimum audio signal path
  • Pure Class A, 100% discrete design
  • Very low noise and high headroom
  • External side-chain access via XLR inputs
  • Variable threshold, ratio, attack & release
  • All signal routing with sealed silver relays
  • Large accurate professional VU meters
  • Fully balanced inputs and outputs

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  • Circuit Topology: High-voltage 100% discrete, balanced and symmetrical Class A
  • Output Gain Range: Variable -10dB to +10dB, center detent 0dB
  • Maximum Input Level: +30dB balanced XLR pin 2 hot
  • Maximum Output Level: +32dB balanced 600 ohms, DC coupled, high-current discrete Class A
  • Input/Output Type: XLR type, pin 2 hot balanced
  • Noise 20kHz, Unweighted: -94dB (compressor in)
  • Distortion THD, IMD: 0.5% (typical 0.05% at +6dB 1kHz)
  • Frequency Response, -3dB: 1Hz to 450kHz (input band limited)
  • Gain Reduction Meter: Illuminated gain reduction meter 0dB to -20dB range
  • Output Meter: Professional moving coil type -20dB to +3dB (0VU=+4dB)
  • Compressor Type: Optical passive attenuator
  • Bypass: Hard-wire relay bypass for compressor in-out
  • Link Switch: Large illuminated push switch for stereo L-R linking
  • Make Up Gain: Variable 20dB range (-10dB to +10dB)
  • Threshold: Threshold variable -24dB to +20dB
  • Ratio: Ratio-compression variable 1:1 to 20:1
  • Attack: Variable 0.5mS to 150mS
  • Release: Variable 80mS to 5 seconds for 12dB release
  • Side-Chain: XLR type, pin 2 hot balanced (switch/relay selectable from front panel)
  • AC-DC Power: External AC supply, 150W toroidal transformer, 4 pin cable 90V isolated
  • Dimensions: 19" x 3.5" x 12"
  • Shipping Weight: 30 lbs

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