Radio Design Labs DS-A2
Passive Line Output Assembly


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Radio Design Labs' DS-A2 is a passive audio output assembly that provides two unbalanced consumer level audio outputs from a balanced line-level audio source.  It may be connected to the +4 dBu line level output of any RDL product, even if that output is simultaneously feeding other equipment.  The DS-A2 circuit design provides a high degree of audio isolation if a user accidentally feeds a consumer-level source into the DS-A2.  The attenuation of such reverse signals is sufficient for most installations.  Active RDL modules are available for complete isolation if required.  The DS-A2 output jacks are transformer isolated from the balanced line input, and the input shield is separated from the case ground to reduce the possibility of induced hum.  The DS-A2 is not intended as an audio input panel.

The DS-A2 fits directly into back boxes, available from RDL, to fit cabinets or US or international walls (RDL WB-1U).  It may also be mounted directly into cabinets or most standard US single gang electrical boxes.


  • Input Level: +4 dBu, nominal
  • Input Connector: Full size barrier block
  • Input Impedance: 10 kO balanced bridging, monaural
  • Output Connectors (2): Phono jacks with gold contacts
  • Input Connections (4): CASE GROUND, SHIELD, + , -
  • Frequency Response: 50 Hz to 20 kHz (┬▒1 dB)
  • Attenuated Signal - Reverse Path: < -50 dB (at 150 O balanced source output, +4 dBu reference, -10 dBV signal injected into output jack)
  • Power Requirement: Passive
  • Dimensions: 4.13" H x 1.7" W x 2.15" D (10.49 x 4.32 x 5.47 cm)
  • Mounting Box Dimension Requirements: 1.8" W x 1.75" D (4.57 x 4.45 cm)
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