INSTALLATION AND CONNECTIONS
4.2.2 AUX and MIX IN inputs
The four AUX-inputs (2 and 23) and the MIX IN-input (21) are provided via RCA-type jacks, which allows the direct connection of common unbalanced audio equipment (CD-Player, Tape Deck, Tuner, etc.). Usually, the needed connection cords are supplied together with the corresponding device. They are also available at basically any electronics store. Especially when using unbalanced cables, cable length matters: the shorter the cable, the smaller the risk of gaining additional noise interference.
4.3Output Assignment 4.3.1 MASTER outputs
The two low-impedance MASTER outputs (19) are electronically balanced and provided via XLR-type connectors, which allows the use of longer cables. All summed MIC/LINE, AUX and MIX IN input signals are outputted via the MASTER outputs. When the DRM 4000 is used in stand-alone operation, the MASTER outputs are typically connected to the inputs of an external power amplifier. When incorporating the DRM 4000 in an intercom system, the MASTER outputs are connected to the inputs of the consecutive central unit (e.g. DPM 4000 or mixer / router).
4.3.2 SEND outputs
The Pre-Fader Master A/B signals are present at the SEND outputs (20) carrying the summed audio signals with the volume levels being independent from the setting of the MASTER controls. Therefore, when connecting the SEND OUT to the MIX IN of a following unit, allows comfortably cascading several DRM 4000 units, which of course doubles the amount of available input channels. For the case that additional input channels are needed cascading up to eight DRM 4000 units is possible. Using the SEND outputs for any other application that requires a summed signal input is possible as well. Examples for such applications are: the connection of open reel recorders, tape decks, or DAT / Minidisc devices for recording purposes as well as the incorporation of a monitor power amplifier or an active monitor speaker system. Since the SEND outputs are unbalanced, cable length matters. Using long cables is not recommended.
4.3.3 DIRECT OUTPUTS
The eight input channels provide DIRECT OUTPUTS (18) each. 12 unbalanced, low-impedance outputs are provided via the Phoenix-type terminal on the rear of the appliance (4 x MIC/LINE and 4 x 2 AUX), allowing separately outputting the input signals for pre-listening / monitoring or other signal-routing purposes. Internal Jumper provide the possibility to individually select for each input channel whether its DIRECT OUT signal path is split PRE - before entering the tone control and volume setting stage - or POST. For details on the location of the wire-bridges that are used for PRE/POST-switching, please refer to chapter 9.1.2. For details on the pin-assignment of the DIRECT OUT connectors, please refer to the following diagram. Make sure to use shielded LF-cables.
