Mounting Into A 19" Rack Or A 19" Cabinet; Ventilation Of The Units; Air Filters; Ventilation Of Racks And Equipment Cabinets - Hoellstern DELTA 6.2-DSP User Manual

3.

Mounting into a 19" Rack or a 19" Cabinet

All devices can be mounted into standard 19" cases (racks and cabinets). Screw the units into place using the two
mounting holes on each of the frontside rack ears. Use only screws with a large head diameter and locking washers.
Please contact us regarding the optional mounting of retainer plates on the back. Never use too long screws; these
might internally damage and destroy the electronics.
3.1

Ventilation of the Units

The amplifiers have a temperature-controlled forced air cooling. NOTE: The direction of the airflow is from front to
back. The fan speed is controlled depending on the internally measured temperatures. Make sure not to obstruct the
air influx and outlet when installing the units. Never use electronic devices in the warm airflow of the amplifiers since
it is hotter than the ambient temperature. For manual function control and during the power-up phase the fans will
momentarily run at a higher speed. Hoellstern amplifiers which offer several operating modes use different fan speed
curves depending on their operating mode and the potential power output.
3.2

Air Filters

The air filters are locked in place by hexagonal perforated steel spring plates. The easiest way to clean the filters is to
vacuum them while mounted. If the open-pore air filter is to be changed, pull the perforated steel plate off the front
panel aperture using a pair of pliers and a screwdriver. A replacement for worn-out air filters may be ordered from the
manufacturer.
A heavily soiled air filter will reduce the cooling capacity and may cause overtemperature. Never use the unit without
an air filter, otherwise there is a risk of the electronics becoming polluted. A malfunction may be the consequence.
Please replace faulty air filters immediately.
3.3

Ventilation of Racks and Equipment Cabinets

Equipment cabinets and 19" racks must be adequately vented. The units may be stacked upon each other. The
housings do not serve as heatsinks.
3.4

Important Mounting Instructions and Tips

Protection of other units from thermal stress:
Do not mount other sensitive electronic devices in close contact with the top lids of the amplifiers. Due to the internal
warming the housing cover will also warm up. If the mains supply is disconnected immediately after high strains, this
will inevitably cause further warming up of the case lid. The heat will be dissipated to devices mounted in direct
contact, causing possible malfunctions or defects in those devices. In general it is advisable not to disconnect the
mains supply immediately after heavy stressful conditions for amplifiers, as the trailing fans will prevent an internal
heat build-up.
Protection from mechanical stress:
Screw two suitable aluminium angle sections laterally into the 19" cabinet which serve as sliding rails and contact
faces for the units. On these rails you can slide the units into place. Several units may be pushed in stacked upon
each other.
4.

Wiring of the Audio Inputs

The audio input connections are made via XLR-3 connectors on the rear panel of the amplifier. Each audio channel
has a Neutrik full-metal XLR female socket and a full-metal XLR male socket for slaving the signal. The input signal
of the female XLR socket is internally directly wired through to the corresponding XLR male socket. The inputs are
balanced and wired as follows:
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