Operation Manual

Making up a rack 27
PRO2 Live Audio System
Owner’s Manual
Special accessories
To comply with part 15 of the FCC Rules, any special accessories (that is, items that
cannot be readily obtained from multiple retail outlets) supplied with this equipment
must be used with this equipment; do not use any alternatives as they may not fulfil
the RF requirement.
Making up a rack
If you are making up a rack, there are careful considerations to be addressed
beforehand, which are outlined in this section.
Outboard equipment racks
To ensure the correct installation and function of the outboard equipment, such as the
DL251 Audio System I/O and DN9696 recorder, racks must meet the following general
requirements.
• Shock mounting (for non-installation environments): The racks must provide
adequate shock protection of the units they house by incorporating appropriately-
designed shock protection methods, for example, a foam-suspended rack or a frame
suspended on anti-vibration mounts etc.
• Ventilation: Midas rack units have been designed such that their internal ventilation
airflow is drawn in through the front of the unit and expelled though the rear. To
facilitate this, rack design must ensure that cool air can flow freely through the rack
in the same direction, that is, in through the front of the rack and out through the
rear. Situations where the air flows in a circular direction around and through a unit
must be prevented. Midas recommends that racks with fully opening front and rear
doors are used.
Note: Never combine units in the same rack that have been designed for a
ventilation air flow direction other than that for the PRO2 units. To avoid this, we
recommend that any non-PRO2 units are housed separately.
• Rack mount supports: Always secure the rear of the units to the rack via their rear
rack mount support brackets. These brackets are fitted to every PRO2 unit and are
recommended for use in touring applications. The rack mount support fixing hole
centres are at a depth of approximately 395 mm from the front panel (this
dimension may differ slightly on the DN9696).
• Handles on rack case: You must ensure that there are sufficient external handles
fitted to the rack casing to enable the rack to be manoeuvred easily and safely, and
by the amount of personnel suitable for the task. Also, these handles must be fit for
purpose.
• Clearance at rear of units: To ensure an adequate clearance at the rear of the
units, we recommend that the rack depth, that is, the distance from the front rack
strip to the rear of the rack, is a minimum of 700 mm.
• Securing the cables: We recommend that the cables at the rear of the units be
tidied using lacing bars and cable ties. This should provide optimum access to the
rear of the units for connecting other cables, switching the units on/off, etc., and
give maximum visibility of the units’ LEDs for determining communication status,
link status, condition of audio etc.