The biosignalsplux 4-channel hub comes with 4 analog channels which allow you to connect up to 4 analog sensors simultaneously (see green check marks below).
The remaining channel is reserved for use of a common reference electrode (for example for multi Electromyography (EMG) acquisitions) or to connect 1 digital sensors (e.g. FNIRS, SpO2).
4-channel hubs are included in the following kits:
Some analog sensors my provide multiple individual sensor signals, which all require their own dedicated port. This can reduce the total number of sensors you can connect to your Hybrid-8 hub.
Example: One Accelerometer (ACC) provides 3 individual signals (1 for each axis) and requires the use of 3 of the available 8 hybrid channels, leaving only 5 open for additional sensors.