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953.148UK User Manual
Speaker outputs
The SA180 can be used with standard low impedance speakers or 100V or 70V line speakers.
Only one type of speaker may be used, so it is important to decide which method will be used at the start.
Standard low impedance speakers
For standard low impedance speakers, connect the “4 - 16Ω” terminal (19) to the positive (+) speaker
connection and “COM” terminal (22) to the negative (-) speaker connection.
It is important to ensure that the total combined
speaker load is no less than 4Ω and that the
combined power handling of the speakers is
equal to or greater than the output power of the
amplifier.
(e.g. a pair of 8Ω speakers connected in parallel
combine to make a 4Ω load)
100V or 70V line systems
For 100V or 70V 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.
Depending upon the speaker type, connect the “100V” (21) or “70V” (20) output terminal to the positive (+)
connection of the speaker and “COM” output (22) to the negative (-) connection of the speaker.
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 or 70V 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 or 70V 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.
Do not use 4 - 16Ω and 100V or 70V at the same time.
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