Grael 4K EEG

32 Channel amplifier

The Grael 4K EEG amplifier is a powerful evolution of the first version of the Grael amplifier. The amplifier is well suited for EEG studies in both research and clinical applications. Whether you are interested in EEG or evoked potentials, or wish to run longterm epilepsy monitoring studies (LTM) or ICU studies, the Grael 4K EEG amplifier will be your choice. Multiple devices can even be combined for running group studies.

A single IP connection to the Grael amplifier provides both power and data transmission, making it very easy to set up the system at different locations in your department.

Product Features


Over 25 years of experience in designing EEG and PSG amplifiers has culminated in the new Grael amplifier range – Compumedics’ most technologically advanced amplifier yet. Four new amplifiers specifically designed to fit your needs! The Grael 4K EEG Amplifier is the most advanced amplifier of them, especially suited for running EEG and evoked potentials, for both clinical and research applications.

Key features

  • Advanced EEG signal acquisition for research and clinical applications
  • LTM, Routine, ICU and Evoked Potentials
  • Sampling Rates up to 4096 Hz
  • User selectable gain allows choice of lower noise or higher allowable DC offset (great for combining EEG with TDCS/TACS or TMS)
  • Combine multiple devices for more channels or group studies (hyperscanning)



  • Max Number of Channels: 45
  • EEG Channels: 32
  • Bipolar Channels: 8
  • Extra Inputs: Event Button,
  • Oximeter with Pleth Waveform
  • DC/AC: DC
  • Max Sampling Rate: 4096 Hz
  • Sampling Rate (Hz): 256, 512, 1024, 2048, 4096
  • Bandwidth: DC-1150 Hz
  • Resolution: 24-bit
  • Input Range: 300mV to 3000mV (4 modes)
  • Sensitivity: 18nV
  • Input Impedance: >100 MOhm
  • Common Mode Rejection (CMRR): >100 dB
  • Noise (peak-to-peak): <2 uV
  • Impedance Check: Yes
  • Trigger: 8-bit TTL
  • TMS Compatible: Yes
  • tACS/tDCS Compatible: Yes
  • Device Synchronization: Includes
  • PTP (precision time protocol) hardware to allow synchronizing multiple units for 64 (or higher) referential channels
  • Headcap Connector: Yes
  • Recording Interface: Ethernet
  • Power: Power Over Ethernet (PoE)



  • Research EEG
  • EEG
  • Event-Related Potentials (ERP)
  • EEG & tACS
  • EEG & tDCS
  • EEG & TMS

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