Avsl Adastra UA60 953.186UK Benutzerhandbuch - Seite 5
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Speaker Connections
The UA series amplifiers can be used either as 100V line amplifiers or standard low impedance power
amplifiers. These 2 configurations cannot be used together, so it is important to decide which method will be
used at the start.
100V line systems
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 (12). Connect further speakers in parallel to the first speaker with all
positive terminals 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 tappings 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.
Low impedance systems
The UA-series amplifiers can alternatively provide an output for a single 8Ω speaker by connecting the "8Ω"
output to the positive (+) speaker connection and "COM" output to the negative (-) speaker connection (12).
It is important to ensure that the speaker load is no lower than 8Ω and that the power handling of the speaker
is equal to or greater than the output power of the amplifier.
Operation
When all connections to the amplifier are made, turn all rotary controls down and switch on the power (11)
A power LED will illuminate at the left side of the audio output indicator LEDs (9).
Use either a microphone or a line input signal for checking the system. Turn up the MASTER rotary control (6)
part way for testing and increase the rotary control for the channel being used for testing (1-5) 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. Then check each input being used in turn to set the correct level.
Note: If a microphone is being used, point it away from the speakers, making sure that it is not able to "hear"
the speakers, which can cause feedback (squealing or howling noise).
When not being used, turn down the MASTER control before powering down to avoid loud clicks or pops.
UA30, UA60, UA90 User Manual