User manual ELECTRO-VOICE DRM 4000

[. . . ] OWNER'S MANUAL DRM 4000 8-IN-2 AUDIO MIXER & ROUTER IMPORTANT SAFETY INSTRUCTIONS The lightning flash with arrowhead symbol, within an equilateral triangle is intended to alert the user to the presence of uninsulated "dangerous voltage" within the product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintance (servicing) instructions in the literature accompanying the appliance. 1. Do not block any of the ventilation openings. Install in accordance with the manufacturer's instructions. [. . . ] Once the ducking threshold has correctly been adjusted (ducking-LED lights while talking into the microphone, but stays dimmed otherwise; i. e. is not automatically activated by environmental noise), use the two ducking controls (8) for setting the attenuation level of the non-prioritized input channels in the setting range between 0 dB to -40 dB. The factory pre-set value is -40 dB. 6. 2 LIMITER OPERATION The two input channels MIC/LINE 1 and 2 employ an internal limiter, which provides the extremely useful function of automatically confining the dynamic range when using the DRM 4000 in microphone applications. Peak levels are trimmed down to a pre-set value (threshold), effectively avoiding distortion and clipping like it might occur in close-miking applications. The limiter threshold is factory pre-set to +5 dBu, which in return provides a maximum output level of +15 dBu (10 dB amplification with the channel's volume control set to its clockwise margin) at the channel output. This setting is most useful for a majority of applications. Changing the limiter threshold in a range between -10 dBu and +20 dBu is possible via an internal trimmer. For further detail, please refer to chapter 9. 2. Please keep in mind that the limiter is meant for equalizing drastic dynamic changes in microphone applications. However, correctly setting the gain control of the input stage is mandatory. 6. 3 Cascading Several Units via MIX IN and SEND Connecting the SEND output of a DRM 4000 to the MIX IN input of a second DRM 4000 doubles the amount of available input channels. The master signal of all input channels is controlled using the master controls at the DRM 4000 that is last in chain. The corresponding outputs are OUT A and OUT B of that "last" DRM 4000. When employing the MIX IN input for this special purpose, set the MIX IN control to its 0 dB-mark. This ensures that the level-ratio is maintained over all units in the chain. Following this principle it is possible to cascade up to 8 DRM 4000 units. However, when cascading several DRM 4000 units, because of their unbalanced design, make sure not to use long cables for connecting the SEND outputs to the MIX IN inputs. Ideally, all cascaded DRM 4000 units are installed underneath each other in a single rack. 6-1 SPECIAL FEATURES OF THE DRM 4000 6. 4 Using The Unit Together With The DPM 4000 The DRM 4000 is an ideal inputs extension for the DPM 4000. Audio connections between the two units are established using balanced cables with XLR-type connectors. Using the optionally available RS-485 remote-interface NRS 90256 allows connecting the DRM 4000 to the DPM 4000 for control purposes. This allows using the DPM 4000's Designer software to comfortably control, configure and save the following parameters: routing, ducking control, preset switching, output levels control. 6-2 SOFTW A R E E D ITOR DRM 4000 7. SOFTWARE EDITOR DRM 4000 The Software Editor DRM 4000 is shipped together with the optionally available extension-kit RS-232 interface (NRS 90258). The DRM 4000 editor software runs under Windows and offers possibilities to comfortably program and monitor the DRM 4000 on-line. 7. 1 System Requirements - PC with Pentium processor - Microsoft WindowsTM 95 / 98 / ME / 2000 / NT - 32 MB RAM - Hard disk with at least 5 MB of free storage - Mouse - VGA-type monitor (The software is optimized for a monitor resolution of 1024x768 pixels) - Graphic-board, 256 colors - RS-232 interface for serial connection to the DRM 4000 7. 2 Installation Notes - Insert the setup disk "1" into the floppy drive "A". [. . . ] Read access: reads a REMOTE-command's actual priority. Value: NO_CHANGE, OFF, MONO_A, MONO_B, DUAL / ?Write access: sets the routing of MIC/LINE 1 via remote (mind priorities!) Read access: reads the routing of MIC/LINE 1, which has been set via remote. Write access: activates or deactivates priority override of MIC/LINE 1 via remote (mind priorities!) Read access: returns the actual status. [. . . ]