Ultra A16 accept unbalance signal input ?
Most balanced equipment will accept unbalanced inputs if wired correctly.
For example an unbalanced signal cable to 3 pin xlr connector would be wired -
shield pin 1
Hot pin 2
Then pin 3 of the xlr connector tied to pin 1
The Rane website has a PDF library that is full of good info.
http://www.rane.com/library.html
This link will help you and is a good resource to keep handy -
http://www.rane.com/note110.html
For example an unbalanced signal cable to 3 pin xlr connector would be wired -
shield pin 1
Hot pin 2
Then pin 3 of the xlr connector tied to pin 1
The Rane website has a PDF library that is full of good info.
http://www.rane.com/library.html
This link will help you and is a good resource to keep handy -
http://www.rane.com/note110.html