Avalon Design

Avalon AD2044 Dual Mono-Stereo, Pure Class A Opto-Compressor

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  • Regular price R 66,549.60

Avalon AD2044 Dual Mono-Stereo, Pure Class A Opto-Compressor

The AD2044 features 100% discrete, pure class A signal amplifier configured with high speed current monitored optical control elements. These "invisible" 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.


The Avalon AD2044 Pure Class A opto-compressor is the most transparent, low noise optical-compressor available today. Designed to optimize absolute signal integrity and musical performance, the AD2044 combines advanced electronics with sonic excellence unequaled by lesser designs. The AD2044 is the perfect solution for two buss music-program compression, mono bass and instruments and  mastering applications.

Features include state-of-the-art, balanced 100% discrete, Pure Class A signal amplifiers, practical "real-world" user features and rugged hardware designed to deliver true high performance audio for many years. 


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


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 that enhances the program material and becomes one with the music itself.

The AD2044 can be found in the world's leading recording studio's, mastering facilities and artist/producers outboard racks. These professionals rely on the AD2044 daily to help them complete their "sonic signature" and turn recordings into musical masterpieces.


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 OutputLevel

+32dB balanced 600 ohms, DC coupled, high-current discrete Class A

Input / Output Type

XLR type, pin 2 hot balanced

Noise 20kHzUnweighted

-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


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 variable -24dB to +20dB


Ratio-compression variable 1:1 to 20:1


Variable 0.5mS to 150mS


Variable 80mS to 5 seconds for 12dB release


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,

(B2T Power Supply Included)

100-240v selectable 50/60Hz, 150w max


19 x 3.5 x 12 in (482 x 88 x 305mm)

Shipping Weight

30lbs (13.6 kg)