The DB-SFRC8L Audio Selector from RDL is a SourceFlex module for wall mounting in a room, providing source selection from up to 8 audio sources. A numeric display shows the selected source. There are two line-level audio outputs on the rear of the unit, balanced and unbalanced, to feed an external power amplifier. The balanced line output level is +4dBu nominal and the unbalanced output is -10dBV.