User manual ELECTRO-VOICE DRM 4000
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Manual abstract: user guide ELECTRO-VOICE DRM 4000
Detailed instructions for use are in the User's Guide.
[. . . ] OWNER'S MANUAL
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. Servicing is required when the apparatus has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped. To completely disconnect mains power from this apparatus, the power supply cord must be unplugged
For US, CANADA and Japan only:
Do not defeat the safety purpose of the grounding-type plug. [. . . ] The background music audio signal fades in smoothly upon finishing the announcement. For using the ducking function, you have to choose a configuration that includes the option PRIORITY OVERRIDE ENABLED for one or both input channels MIC/LINE 1 and 2 (see enclosed information sheet "DRM 4000 FACTORY CONFIGURATION"). Owning one of the two optionally available interface boards lets you configure the DRM 4000 according to your personal requirements. Please keep in mind that the ducking control automatically affects the corresponding output channel(s), to which the prioritized input channel is assigned. Using the gain control for setting the input level of a prioritized channel and while talking into the connected microphone, depending on the channel's routing, you should be able to see one or both yellow ducking-LED's (9) lighting, which indicates that the ducking function has been activated for either output channel (A or B) or for both. Otherwise, re-adjust the ducking control's threshold setting via the Ducking Threshold control (DUCK THR) (5). Turning the control in the counterclockwise direction decreases the set value while turning it clockwise increases the threshold setting. 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. Changing the limiter threshold in a range between -10 dBu and +20 dBu is possible via an internal trimmer. 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.
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. [. . . ] Controlling the unit is possible parallel to any other control method (hardware contact switching, software contact switching, external VCA-control), with any individual priority being recognized. For example, activating an external contact with a higher priority setting overrides actual remote settings. As soon as deactivating the contact again, all previous remote are regained. Generally, all REMOTE-commands have the lowest priority (0) and all entries are set to NO_CHANGE. [. . . ]
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