Operation; Maintenance - Omnitronic PA-240 User Manual

INPUTS
A good cable run improves the sound quality remarkably. Input cables should be short and direct, since high
frequencies will be mostly be absorbed if the cables are unnecessarily long. Besides that a longer cable may
lead to humming and noise trouble. If long cable runs are unavoidable, you should use balanced cables.
The inputs of your OMNITRONIC PA 240 are equipped with 6.35mm and Cinch jacks.
OUTPUTS
The high damping factor of your amplifier supplies a clear sound reproduction. Unnecessarily long and thin
cables will influence the damping factor and thus the low frequencies in a negative way. In order to safeguard
good sound quality, the damping factor should lie around 50. The longer a cable has to be, the thicker it
should be.
The outputs of your OMNITRONIC 200 are equipped with Screw/clamp jacks.
CONNECTION TO THE MAINS
Connect the OMNITRONIC PA 240 only after having made sure that the right voltage (220/230V) is supplied
and that the ground lead is earthed. This device falls under potection class I. Do not detach the ground lead
from the housing!
This device features a 4A fuse.
STEREO OPERATION
Connect the input signal to the input jacks on the rearpanel.
Connect your speakers to the Screw/clamp jacks Output Channel 1 and Output Channel.
Caution! The impedance of the speakers must be between 4 and 16 Ohm.
Caution! Before switching on your amplifier, please refer to the explanations under Operation.
Adjust the level of each channel with Gaincontrol CH1 and CH2 on the frontpanel.
Caution! Increase the level of each channel only so far that the Clip LED lights up shortly. Thus, you avoid
that the output signal is distorted and your speakers are damaged.

OPERATION

After having connected your amplifier to the mains, turn both gain controls counter-clockwise to null-position.
The last device to be switched on is the amplifier. The "power on" LED lights up now. If it does not, check if
the amplifier is connected to the mains correctly.
After the turn-on delay the speakers are activated.
After having set the volume controls of the pre-amplifier in null-position, turn the gain controls of your amplifier
to mid-position. You must not hear any loud humming. If there is humming nevertheless, check the connec-
ting cables between the pre-amplifier and the amplifier. Now adjust the volume with the gain controls CH1 and
CH2.
All important operating modi of the amplifier are displayed on the frontpanel.
CLIP short-circuit or impedance too low or signal distorted
-20 dB input signal available
PROTECT active during stabilisation period after switching on or when one of the
protective circuits started
POWER amplifier is online
THERMAL when overheated
If you want to switch off the system, switch off the amplifier first and then the pre-amplifiers in order to
avoid acoustic shocks on the speakers.

MAINTENANCE

The ventilation grille has to be cleaned regularly. Never use aggressive detergents - simply use a damp cloth
instead
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