Q4™ Specifications

Unlike most EQs that employ high-gain, low-noise chips to convey a sense of clinical accuracy, the Radial Q4 is all about adding analog character to the signal path. This is achieved using 100% discrete parts throughout to produce the unique class-A circuit architecture. With this approach, you will encounter a slightly higher noise floor, a little bit more distortion and of course, overdriving the Q4 will occur more rapidly as you push it beyond it's intended working range. But these are the very characteristics that one looks for when recording with vintage audio devices. Yet even with this in mind, the Radial Q4 still manages to deliver less than 0.01% distortion and better than 90dB signal-to-noise. This is truly impressive given the nature of this unique EQ design.

Specifications are subject to change without notice.
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
Controls: Hi & low frequency shelving
  Hi mid & low mid semi parametric EQ
Switches: Wide & Narrow Q
EQ bypass
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
Conditions: For use in dry locations only between 5°C and 40°C
Warranty: Radial 3-year, transferable
*Radial is not a member of the VPR Aliance