Avalon AD2055

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A pure class A stereo EQ unit. 4-band, with switchable low and high peak or shelf, and fully parametric high and low mids. Super wide band width, transparent, accurate and powerful.


The Avalon AD2055 is a 2U rack-mounted Class A dual-mono 4-band parametric EQ.

By combining both active and passive filter elements the Avalon AD2055 is capable of great definition in operation and yet remains transparent and uncoloured. The Class A design helps there too, keeping the signal path uninterrupted and the signal strong all along the line. Because the high and low frequencies on the Avalon AD2055 are switchable and the mids are fully parametric, you can zero in on just the information that you need and bring out all the detail.

The layout of the AD2055 from Avalon Design is very user-friendly and intuitive and the controls naturally fall under your fingers whenever you need to make an adjustment. It is this approach to design that has kept Avalon at the forefront of studio technology since its inception. The Avalon AD2055 units are very popular amongst recording and mastering engineers all over the world.

Avalon Design likes to take a simple concept and just make it better. The Avalon AD2055 is a perfect example of this – when something is made with the best quality components and put together with absolute musical performance in mind, you get what you pay for – the best.

Avalon AD2055 Overview:

• Pure Class A, 100% discrete design
• Smooth musical detail and sonic excellence
• Minimum audio signal path
• Dual mono operation
• Transparent active and passive filter design
• High headroom +30dB Very low noise -94dB
• Fully balanced inputs and outputs
• DC coupled, no transformers in audio path
• Switched frequencies in high and low bands
• Mid bands use X10 frequency for extended range
• Wide bandwidth -3dB 1Hz to 450kHz
• Low distortion less than 0.5% THD and IMD
• All signal routing with sealed silver relays Conductive plastic potentiometers for low noise
• External 150W toroidal power supply 100% discrete power supplies for audio path
• Long lasting, stainless steel hardware
• Circuit Topology High-voltage 100% discrete, balanced and symmetrical
• Class A Output Gain Range Unity Gain
• 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 (EQ in)
• Distortion THD, IMD 0.5% (typical 0.05% at +6dB 1kHz)
• Frequency Response -3dB 1Hz to 450kHz (input band limited)
• Equalizer Type Passive high and low bands plus two fully parametric mid bands
• Bypass Hard-wire relay bypass for equalizer in-out
• Low Band F1 Passive, amplitude to -32dB to +32dB shelf or peak-dip curve
• F1 Frequency Range Switched 10 position 18Hz, 25, 30, 50, 72, 100, 150, 215, 300, 450Hz
• Mid Band F2 Active, amplitude to -16dB to +16dB peak-dip curve
• F2 Frequency Range Variable 35Hz to 450Hz (x10) 350Hz to 4k5Hz, Q (width) 0.3 to 3.0
• Mid Band F3 Active, amplitude to -16dB to +16dB peak-dip curve
• F3 Frequency Range Variable 160Hz to 2k0Hz (x10) 1k6Hz to 20kHz, Q (width) 0.3 to 3.0
• High Band F4 Passive, amplitude to -26dB to +26dB shelf or peak-dip curve
• F4 Frequency Range Switched 10 position 1k5Hz, 2k5, 3k5, 5k, 7k2, 10k, 12k5, 15k, 20k, 25kHz
• 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
• Dimensions 19 x 3.5 x 12 in (482 x 88 x 305mm)
• Shipping weight 30lbs (13.6 kg)



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