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16 July 2024
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TECPRO AD903 2 to 4 wire adapter

Stock code
Model number
  • AD903
TECPRO AD903 2 to 4 wire adapter
TECPRO AD903 2 to 4 wire adapterTECPRO AD903 2 to 4 wire adapter


AD903 Auxilliary input and output adapter

  • Input and output on 4-wire side are transformer balanced, isolated and floating – reduces likelihood of hum and interference
  • Very wide input and output ranges – will interface to mic or line level systems
  • Sidetone null adjustment to minimise input to output crosstalk
  • All presets are multiturn types for easy adjustment
  • Industry standard XLR type connectors

The AD903 2 to 4 wire adapter allows connection of almost any audio source to a Tecpro ring intercom 2 wire system. For example, most broadcast video cameras have in-built 4 wire comms systems which are cabled within the main video cable. Use of an AD903 at the camera control unit will allow that camera to appear as a part of the Tecpro communication system, while minimising extra wiring and expense. The AD903 will work with most separate send and receive communications systems in the same way. Levels are totally independently adjustable on input or output.

Other applications include injection of microphone or line level external inputs onto the comms system, and the provision for external equipment such as recorders, radio links, audio consoles or paging systems to listen to the comms system.

Technical Specification
Power requirements: 24-30v DC at 15mA from comms system
External input: –60 to +30dBu into 10k ohm nominal, balanced and floating
External output: –60 to +18dBu into 10k ohm nominal source, balanced and floating
Connections: 4 wire via XLR 4 pin male
Intercom ring (2-wire) via XLR 3 pin male and female (loop-through)
Controls: Mic/line switches and 10 turn presets to external system input and output
Sidetone null: 10 turn preset
Dimensions: 107 x 93 x 50mm
Weight: 420g
Construction: Black anodised extruded case with glassfilled nylon bezels for protection.
Accessory cable: ‘Y’-lead YL908 is specifically designed for connecting outboard equipment to an AD903 auxiliary adapter and has 4 pin female XLR splitting to one male and one female 3 pin XLR, for 4 wire connection.
  Description Price £
ex. VAT
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TECPRO AD903 2 to 4 wire adapter Stock code: 27-903
7 in stock Need more?
TECPRO YL908 Y-lead for AD903 Stock code: 27-908
9 in stock Need more?