STD-600 Audio Divider / Combiner
The audio divider/combiner shall be an RDL STD-600. The unit shall provide four balanced audio channels each equally coupled to the other three through a resistive branching network. Each channel shall be capable of operation as either an input or as an output.  The four channels in the unit shall be capable of operation in either a mic-level or line-level circuit.

The unit shall be passive and shall not include reactive components in the audio path capable of altering frequency response.  The insertion loss between any two channels shall not exceed 3 dB nominal. The unit shall operate with input levels up to +22 dBu.

Each channel shall be configured and specified for operation in a 600 O circuit. Each channel shall incorporate circuitry to reduce the transfer of radio frequency energy through the unit.

The unit shall be constructed in an electrically non-conductive, thermally conductive enclosure. Internal circuitry shall be protected from moisture and vibration using a thermally conductive compound that permanently secures the circuitry within the enclosure.

The face of the unit shall provide graphical labels identifying wiring connections.

Connection to external wiring shall be provided using a fixed terminal block on the edge of the unit. The terminal block shall accept wiring gauges from 14 to 22 and shall include a positive electrically conductive mechanism to prevent wire abrasion by the terminal screws.

The unit shall measure 3” (7.6 cm) x 1.6” (4 cm) x 0.7” (1.7 cm) and be compatible with all RDL STICK-ON mounting accessories. The unit shall be supplied with a two part re-closable polypropylene fastener system equipped with a rubber adhesive that bonds to low surface energy materials.

The unit shall passive requiring no power supply. The unit shall be engineered, assembled and tested in the U.S.A. and be specified for continuous duty in professional installed systems. The unit shall be specified for operation in an ambient temperature between -20 and 60 degrees C. The unit shall comply with relevant EMC requirements and shall bear the CE marking.

The unit shall be an RDL STD-600.