PreSonus ACP22 - Manual (Page 13)

Controls & Connections
2.6 Patch Panel (Back)
Input
The input jacks are unbalanced tip/sleeve connectors or balanced XLR
connectors. The input can handle up to +24dBu unbalanced or up to +18dBu
balanced signal levels.
Output
The output jacks accept balanced XLR or unbalanced tip/sleeve
connectors. The output will deliver up to +24dBu in signal level, balanced or
unbalanced.
Cable Connection Diagrams