EQ52 500-SERIES EQUALIZER
Single Channel Mastering Quality Equalizer with Simple and Intuitive Interface
EQ52
Features
Low Cut Filter: 50 Hz to 5 kHz in two ranges, continuously adjustable
See-Saw Filter: simultaneous bass boost / treble cut and vise versa
See-Saw pivot frequency continuously adjustable from 120 Hz to 26 kHz in two ranges
8 dB max See-Saw cut / boost
High Cut Filter: 3 kHz to >200 kHz continuously adjustable
Low and high cut filters use gentle and musical -6 dB / octave
Balanced input and output
Unity gain, with output driving either balanced or unbalanced
Input impedance: 48k Ohms differential
Output impedance: 100 Ohms differential
Max input level: +20 dBu
THD: 0.002 % Typ at +20 dBu
CMRR: 90 dB Typ at 60 Hz
Noise: -96 dBu
The Ingram Engineering EQ52 is a 500-series equalizer module that contains extremely versatile, musical sounding Low-Cut, High-Cut, and See-Saw filters. The unique See-Saw filter is a combined bass and treble frequency control that allows broad frequency response adjustments with a single control knob. A new EQ52 feature, rarely implemented in analog filters, is the ability to sweep the See-Saw pivot frequency. The low phase shift filters have broad and gentle roll off that enable transparent control of audio timbre without artifacts. With its features and sound quality, the unit can be used for virtually any task, from subtle EQ’ing during mixing or mastering to sidechain filtering for compressors or extreme filtering for effect. These key filter functions are provided with a simple and intuitive user interface. The unit includes a hardwire bypass.

The EQ52 features differential input and output. Both input and output can operate in differential or single-ended, unbalanced modes. A high current active output buffer mimics the behavior of a transformer, providing constant gain for balanced or unbalanced operation, when either the positive or negative output signals are grounded. Therefore, the output can drive differential or single ended output with no extra user configuration needed.

The simple controls and circuit layout belie the finely tuned and expertly engineered design. Extremely high input common mode rejection capability is realized, even down to critical power supply frequencies. High quality film caps, low distortion resistors and excellent quality integrated active stages realize a high headroom, low noise, and low distortion equalizer with superb audio quality that is ideal for individual tracks or for mixing and mastering stereo signals when the modules are used in pairs.