If you are looking for this file specifically for an installation, you can typically find documentation and technical specifications on the official RDL ST-UBA2 product page .
: It converts unbalanced consumer format signals (-10 dBV) to professional balanced +4 dBu signals. uba2.zip
ST-UBA2 Unbalanced to Balanced Amplifier - RDL® If you are looking for this file specifically
Description. The ST-UBA2 is used in any application requiring conversion from unbalanced consumer format signals to professional + rdlnet.com ST-UBA2 Unbalanced to Balanced Amplifier - RDL® uba2.zip