Shop Now, Pay Later with Affirm. Learn More

Radial Engineering
Q4 500 Series Parametric Eq

Be the first to review this product

Item: N13-2210

Availability: In stock

Q4 500 Series Parametric Eq


The Radial Q4 is a unique equalizer that combines the warmth and detail of a pure class-A circuit with the character of true 100% discrete state-variable filters. In other words, no integrated circuits are employed whatsoever.

Each full size through-hole part is carefully inserted by hand and then wave soldered to ensure optimal signal flow. This produces a level of sonic warmth and musicality that excels above the others.

Designed to fit in the Radial Workhorse and other 500 series racks, the Q4 features four frequency bands with high and low shelving at 10kHz and 100Hz and two semi-parametric mid sections that let you sweep frequencies from 300Hz to 8kHz.

The two mid-bands can be further optimized by selecting either a wide or narrow Q. All frequencies may be cut or boosted by up to 12dB - affording plenty of range. A handy 'bypass' switch lets you compare the dry tone with the EQ's effect and for those equipped with a Workhorse, the Omniport is designated as an unbalanced ¼" TRS input/output connection that can be inserted into a console channel strip using a single TRS cable.

This makes the Q4 a wonderful choice for adding analog character to a voice or instrument and a natural for enhancing music program material.


  • Four band semi-parametric equalizer
  • 100% discrete class-A state-variable filters
  • Sounds exceptionally warm and natural
  • Fits all standard 500 series power racks

Questions on Q4 500 Series Parametric Eq

No questions asked yet

Ask Your Own Question


  • Circuit type: Discrete state variable class-A
  • Frequency response: 20Hz ~ 20kHz
  • THD+N: 0.03% @ +4dB
  • Maximum input level: +21dBu
  • Maximum output level: +18dBu
  • Gain: +/-12dB for each band
  • Dynamic range: >95dB
  • Equivalent input noise: -95dBu
  • Common mode rejection ratio: >64dB @ 55Hz
  • Intermodulation distortion: 0.07%
  • Input impedance: 20K Ohms
  • Output impedance: 150 Ohms
  • Hi & low frequency shelving Controls
  • Hi mid & low mid semi parametric EQ Controls
  • Wide & Narrow Q Switche
  • EQ bypass Switch
  • Omniport: Configured as TRS in out connection
  • Power requirement: 80mA
  • Compliance: Yes - with API 500 series VPR aliance*
  •  Yes - with Radial WHOS-Doc specification
  • Size: Standard 500 series rack format
  • Weight: 1.5 lbs. (0.7 kg)
  • Shipping Size (L x W x H) : 9" x 6.5" x 2"
  • Shipping Weight: TBA
  • Warranty: Radial 3-year, transferable

Customer Reviews

Write Your Own Review

You're reviewing: Q4 500 Series Parametric Eq

How do you rate this product? *

  1 star 2 stars 3 stars 4 stars 5 stars