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TK Audio TK-lizer 500 500 Series Dual Mono EQ


Part of the 500 series of modules, the TK Audio TK-lizer 500 is a stereo Baxandall EQ with a built-in M/S circuit. It may have fewer controls than its rackmount counterpart, but the TK-lizer 500 packs in powerful EQ functionality into a module format.

With its broad frequency shaping capabilities, the Tk-lizer 500 is designed for use as a mastering EQ. With comprehensive EQ controls and the ability to process mid and side channels separately, the TK-lizer 500 offers a great deal power over your EQ while keeping it sounding smooth and natural.

Baxandall-Style EQ

The TK-lizer 500 is a Baxandall-style EQ. As opposed to boosting or cutting very specific frequencies, a Baxandall EQ has a smoother frequency curve which is great for broad EQ shaping of the overall sound. This is what makes it ideal for mastering as you can adjust the final EQ while keeping the frequency curve sounding natural. The TK-lizer 500 features a 3-band Baxandall EQ with the high and low bands switchable between shelving and peak, and a variable high pass filter. All the controls are stepped which makes it easier to recall exact settings.

M/S Circuit

For even more control, the TK-lizer 500 features a built-in M/S circuit which lets you process mid and side channels separately. This is a valuable feature for stereo EQs as it lets you adjust the stereo width (sense of “space”) on your track.


  • Power requirement: +190mA / -80mA (extended over two slots)
  • Frequency response: 20Hz to 50kHz +/-0.2dB
  • THD @ +4dBu less than 0.0006%
  • THD+N @ +26dBu is less than 0.001%
  • Signal to noise ratio: 95dB
  • Cross talk: -89dB
  • Input impedance: 24kohm
  • Output impedance: 50ohm
  • Max input level: +26dBu
  • Max output level: +27dBu
  • Q~0.5
  • In/Out
  • Level: Infinity to +6dB (Unity gain at 12’o lock)
  • EQ in/out. (LED red for out, green for in)
  • M/S in/out

Low band:

  • Frequency: 28Hz, 48Hz, 72Hz, 132Hz, 195Hz, 255Hz
  • Boost/cut: +/-8dB
  • Peak or Shelf

Mid Band:

  • Frequency: 400Hz, 630Hz, 870Hz, 1.3kHz, 2.4kHz, 4.8kHz
  • Boost/cut: +/-8dB

High Band:

  • Frequency: 4kHz, 7.2kHz, 12kHz, 16kHz, 20kHz, 25kHz
  • Boost/cut: +/-8dB
  • Peak or Shelf

High Pass Filter

  • Frequency: 25Hz, 30Hz, 35Hz, 40Hz, 45Hz, 100Hz, 12dB / octave
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