The ES-9's specifications are as follows:

Panel width: 16HP
Module depth (including power cable): 50mm
Current draw: 451mA on the +12V rail, 133mA on the -12V rail (at 96kHz)
USB socket: Type C
Driver suport: class-compliant USB 2.0 (no driver required for macOS and iOS - Windows drivers provided for Windows 7, 8 & 10)
Channel count: 16 in, 16 out
Supported sample rates: 44.1kHz, 48kHz, 88.2kHz, 96kHz
Audio sample depth: 24 bit
Analogue outputs:
8x 3.5mm TS jacks, DC-coupled, Maximum output voltage approximately ±10V
2x 1/4" TRS balanced jacks, AC-coupled (main outs)
1x 1/4" TRS stereo jack, DC-coupled (headphones)
Analogue inputs:
14x 3.5mm TS jacks, DC-coupled, Input voltage range approximately ±10V
Digital I/O: 1x S/PDIF input (TOSlink), 1x S/PDIF output (TOSlink)
MIDI I/O: 1 input, 1 output (on breakout)
Expansion headers: 1 for ES-5, 1 for MIDI breakout
Panel controls: headphone volume
Internal mixer: 8x8 crosspoint mixer

https://www.expert-sleepers.co.uk/es9.html

• 16hp
• 451 mA +12V
• 133 mA -12V
• 0 mA 5V
• 50 mm deep