Single Channel Mastering Quality Equalizer with Simple and Intuitive Interface



  • 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.


EQ52 360 Degrees
360 View
EQ52 Out of the box
Out of the Box
EQ52 360 Degrees
Mono Discussion
EQ52 360 Degrees
Stereo Discussion

EQ52 Reviews

Product Literature

Audio Sample Files with Various EQ Settings

The following files show the capabilities of this equalizer. Various music was recorded then equalized to show the effects of the Low Cut, High Cut, and See-Saw filters.

The following audio samples were recorded by Michael Frasinelli of Audio Producer News. The samples include isolated bass, vocals, and a master mix. Michael did a great job showing how the equalizer can be used to fine tune the music to bring out its best character. For comparison, samples with no EQ are included, as well as some samples that use EQ plugins. The plugins provide a very good contrast to the Ingram Engineering equalizer's silky result.

For offline, high resolution A/B comparisons, .WAV files can be downloaded, then loaded into your DAW.


Bass Samples

-3.25dB@1KHz 25Hz HPF, 15KHz LPF
-3.25dB@400Hz 30Hz HPF
Plugin -3.25dB@400Hz

Master Samples

1KHz -.75dB 20Hz HPF Final Setting
400Hz -.75dB 20Hz HPF
Plugin Matched to 1KHz Setting

Slap Bass Samples

+1.5dB@400Hz 22Hz HPF, 10KHz LPF
-3dB@1KHz 22Hz HPF, 14KHz LPF
Plugin -4dB@400Hz

Vocals Samples

-.75dB @ 1KHz 125Hz HPF 17KHz LPF
-1dB @ 1KHz 125Hz HPF
Plugin -1dB @ 1KHz Added Clean 125Hz Plugin HPF

A Word About The EQ50

Linked below is information on the EQ50, which is the predecessor of the EQ52. The EQ50 contained the same basic features as the EQ52, but without the continuously variable See-Saw pivot frequency. The performance and features of the EQ50 model became the baseline from which the innovative features of the EQ52 could be launched.


Product Literature