Power Dynamics PMP Serie Manuel D'instructions page 6

SPEAKER TERMINALS
These terminals are offering a low voltage output of 4Ω (minimum load). A 100V commercial output is also available.
Please note that one wire only should be connected to COM screw and one wire to the selected impedance or voltage.
ATTENTION: Multiple combinations cannot be done at the output level.
Two different types of connections are provided. The low impedance section: 4Ω (minimum load) is designed for a small amount
of speakers to be connected to your amplifier. The 100V section is especially designed for a multiple speaker distribution. When
using the 100V output, speakers have to be equipped with a 100V transformer. The maximum amount of speakers to be placed
on your distribution line is in relation to the power allocated to each speaker. The total wattage set on the secondary side of the
transformers on your speaker line must not exceed the maximum RMS output power of the device. Failure to respect this may
cause permanent damage to the amplifier.
OPERATION STEPS
•
When all connections to the amplifier are made, turn all rotary controls down and switch on the power (the power LED will
illuminate). Turn BASS and TREBLE controls to the 12 o'clock position (pointing straight up) and turn MASTER rotary
control up part way for testing.
•
Ensure a signal is being fed to one of the inputs and gradually increase the volume control for that channel until the output
is heard through the speakers. Turn up the MASTER to the maximum required volume level and reduce the channel
volume control if necessary.
Note: The initial test can be made using the built-in USB audio player. The output of the amplifier is represented on the
level meter LEDs and care should be taken that the CLIP LED is not (constantly) lit during use. Illumination of this LED
may be indicating distortion or clipping of the output signal and the MASTER/MAIN VOLUME should be turned down.
•
If a microphone is connected, make sure it is switched on and if it requires phantom power, make sure this feature is
enabled. Gradually increase its volume control whilst speaking into the microphone until the required volume level is
reached. The microphone should not be able to "hear" (detect) the speakers, which can cause feedback (squealing or
howling noise).
In addition to channel and MASTER volume controls, there are BASS and TREBLE EQ controls to adjust the tone of the overall
output. At the 12 o'clock position, these controls are applying no effect to the signal (no boost or cut). Rotating the BASS control
clockwise boosts the low frequencies in the audio, whilst rotating it anticlockwise will cut these low frequencies. Likewise,
rotating the TREBLE control clockwise boosts the high frequencies in the audio, whilst rotating it anticlockwise will cut these
high frequencies. Adjust these EQ controls to suit the type of audio signal or compensate for the room acoustics.
•
Normally, playback will start automatically when a USB stick is inserted in the corresponding slot. If not, select USB by
pressing MODE to initiate the USB mode manually. Press PLAY / PAUSE to start playback. Press PREVIOUS and/or
NEXT to change tracks.
100V LINE SYSTEM
For 100V line systems, connect the amplifier to the first speaker in the system using double-insulated speaker wire which has
adequate current rating to handle the total output of the amplifier.
Connect the "100V" output terminal to the positive (+) connection of the speaker and "COM" output to the negative (-)
connection of the speaker. Connect further speakers in parallel to the first speaker with all positive terminals and connected
together and all negative terminals connected together as shown below.
A 100V line speaker system can comprise of many speakers connected together. The determining factor for how many
speakers can be used on a single amplifier is the power rating. For most purposes, it is advised to connect as many speakers
as needed with a combined wattage of no more than 90% of the amplifier's output power rating.
The terminals of a 100V speaker are connected to a transformer and in some cases, this transformer may be "tapped" for
different power ratings. These tapings can be used to adjust the wattage (and output volume) of each speaker in the system to
help achieve the ideal total power of the system for the amplifier.
6