For sale is my IGS Audio 825EQ Stereo Tube Mastering Equalizer, in excellent condition and fully functional.

This has been used carefully in a professional mastering environment and has spent its life installed in a studio rack. It is an extremely musical stereo mastering EQ that combines tube circuitry, transformers, inductors, and fully stepped controls for precise recall.

The 825EQ is designed specifically for mastering and high-end mix-bus work. It offers a wide range of tonal shaping while remaining exceptionally smooth and musical. Small moves can add weight, openness, depth, or presence without the EQ ever feeling aggressive.

Features include:

• Five-band stereo tube mastering equalizer
• Fully stepped controls for precise recall
• High-quality ELMA rotary switches
• Dual-mono architecture
• UTM transformer-balanced inputs and outputs
• Three audio transformers per channel
• Three tubes per channel
• Broad frequency range extending approximately 10 Hz–50 kHz
• Adjustable Q
• Up to ±12 dB boost/cut, depending on version
• XLR balanced inputs and outputs
• Designed for mastering, stereo bus processing, and high-end mix applications

Sonically, the 825EQ can be extremely transparent when used subtly, while also providing the harmonic richness and dimensionality associated with tubes, transformers, and inductors.

This particular unit is in excellent cosmetic and operating condition, with only very minor evidence of professional rack use. Please review the photos for exact condition.

I am selling it only because I am changing some of the analog equipment in my mastering chain.

A fantastic mastering EQ for anyone looking for precise stepped control combined with genuine analog character.

Professional studio equipment — carefully maintained and ready to work.