PARK AUDIO DF -series, Owner'S Manual, Page: 6 / 23

When it is necessary to achieve a linear frequency response to drive full-range
loudspeakers, generally used in studios or in cinema theatres, the input filter can be
disabled (bypassed for each channel individually) with the slide switches located on the
amplifier rear panel.
Below see the enabled and disabled filter low frequency response diagrams.
20Hz 50Hz 100Hz 200Hz 900Hz
-10
-5
0
5
10
ON (45 Hz )
20Hz 50Hz 100Hz 200Hz 900Hz
-10
-5
0
5
10
OFF
Built-in Two-Way Crossover
This feature is to save your money and effort when driving two-way loudspeakers.
The frequency range (high, low, full range signal) is selected individually for each
channel with a slide switch. The crossover frequency point is factory preset (generally
to 125Hz). However, it can be changed by replacing the crossover PCB.
Input Level Attenuators
These allow setting the amplifier to the required sensitivity (each channel
individually) which is very helpful when several amplifiers are used to drive different
types of loudspeakers or are used within multi-speaker sound reinforcement systems.
The attenuators are located on the front panel.
Optoelectronic Clip-Limiter
The Clip-limiter is to reduce the input signal level as soon as any emergency or
overload occurs to prevent any sound distortion.
Detachable Power Cord
This feature is provided for convenience of transportation and rack mounting.
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