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.

Audio circuit type: Discrete state variable class-A
Frequency response: 20Hz ~ 20kHz
Dynamic range: >95dB
Gain: +/-12dB for each band
Total harmonic distortion: 0.03% @ +4dB
Intermodulation Distortion: 0.07%
Input Impedance: 20K Ohms
Output Impedance: 150 Ohms
Common Mode Rejection Ratio: >64dB @ 55Hz
Equivalent Input Noise: -95dBu
Maximum Input: +21dBu
Maximum Output: +18dBu
Extras: API and WHOS-Doc Compliant
Construction: 14-gauge steel
Size (L x W x D): 9" x 6.25" x 2" (228 x 159 x 51mm)
Weight: 1.5 lbs. (0.7 kg)
Power: 80mA
Conditions: For use in dry locations only between 5°C and 40°C
Warranty: Radial 3-year, transferable

Q4 Resources

Part no: R700 0162 00