Aiphone BX-1200 User Manual
Page 9
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it is requested that the total speaker load impedance be correctly matched to the output impedance of
the amplifier for the most efficient transfer of power.
Be sure that total impedance of speakers is above 4, 8 or 16 ohms. However, do not use a speaker rated
at less power than the amplifier is capable of producing, otherwise the speaker will be damaged.
16f2
\Z7
—tzi-------------
4Q
0 \______________ / \_________ /
o ^1
y—
4О2
4Ь.
25 volts and 70.7 volts Output;
When It is desired to operate the speaker from a distance of over 200' {60m) from the amplifier and/or
the system requires more than four speakWs, It is recommended that line matching transformers be
used for the speakers to prevent excessive line losses.
This method of load matching is known as the constant voltage distribution system, and eliminates the
calculation of load impedance and series-parallel speaker arrangements. In this method, all speakers are
connected in parallel.
These constant voltage outputs are most convenient for distribution of power when a number of speakers
are installed. Each speaker must have 25 volt or 70.7 volt line transformer with a tap that gives the power
desired for that speaker. The total number of power settings for ail speakers should be equal to the
amplifier power rating or less.
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