Operating Voltage; Mains Switch; Mounting; Ventilation - Electro-Voice Q1212 Owner's Manual

PROFESSIONAL POWER AMPLIFIER

2.2 Operating Voltage

The power amplifier receives its power supply via the Mains input. Only the provided power cord may be used. During
installation, always separate the power amplifier from the mains. Connect the power amplifier only to a mains network, which
corresponds to the requirements indicated on the type plate.

2.3 Mains Switch

The Mains Switch on the front panel separates the power amp from the mains. Turning
the Mains Switch to ON starts booting up the power amp. A soft start circuit compensates
mains inrush current peaks and thus prevents the automatic cutout of the mains from
reacting when switching on the power amplifier. Speaker system switch-on is delayed by
approximately 2 seconds via output relays, effectively suppressing any possible power-on
noise, which otherwise might be heard through the loudspeakers. PROTECT-LED lights
up and fans are at high speed during this delay. This indicates all protections are working
fine.

2.4 Mounting

Q amplifiers have been designed for installation in a conventional 19-inch rack case. Attach the power amp with its frontal
rack mount ears using 4 screws and washers as shown in following illustration.
Additionally securing the amplifier at the rear becomes necessary, if the rack case in which the power amplifier has been
installed will be transported. Failure to do so may result in damage to the power amplifier as well as to the rack case. Attach
the power amp as shown in the illustration using 4 case nuts and screws. Brackets for securing the power amplifier are
available as accessories.

2.5 Ventilation

As with all Electro-Voice power amps with fan cooling, the airflow direction is
front-to-rear, obviously because there is more cold air outside of the rack case
than inside. The power amplifier remains cooler and dissipating the developing
waste heat in a specific direction gets easier. In general, setting up or mounting
the power amplifier has to be done in a way that fresh air can enter unhindered at
the front and exhausted air can exit at the rear. When installing the power amp in
a case or rack system, attention should be paid to these details to provide
sufficient ventilation. Allow for an air duct of at least 60 mm x 330 mm between
the rear panel of the power amplifier and the inner wall of the cabinet/rack case.
Make sure that the duct reaches up to the cabinet's or the rack case's top
ventilation louvers. Leave room of at least 100 mm above the cabinet/rack case for ventilation. Since temperatures inside of
the cabinet/rack case can easily rise up to 40 °C during operation of the power amp, it is mandatory to bear in mind the
maximum allowable ambient temperature for all other appliances installed in the same cabinet/rack case.
CAUTION:
Blocking/closing the power amp's ventilation louvers is not permissible. Without sufficient coo-
ling/ventilation, the power amplifier may automatically enter protect mode. Keep ventilation lou-
vers free from dust to ensure unhindered airflow.
Do not use the power amplifier near heat sources, like heater blowers, stoves or any other heat
radiating devices.
To ensure trouble-free operation, make certain that the maximum allowable ambient
temperature of +40°C is not exceeded.
8 Owner's Manual