Section 2: Installation & Programming
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70-Volt Speakers
To avoid prohibitive cable losses on long speaker lines (over 100 feet), use 70 V speakers. The power level in the
70 V speakers is set at each speaker. 250 watts of the 1000 watts is provided for 70 V speakers by A1, A2
connections on the audio output transformer assembly.
NOTE: 1000 watts can be connected if you configure the amplifier for stereo and connect 70-volt speakers E7 to
E7.
Low Impedance Speakers
Low impedance speakers (8- or 4-ohm) can be used when the connecting cable is less than 100 feet.
4-OHM SPEAKERS
No more than one 4-ohm speaker should be connected to a speaker line. If several 4-ohm speakers are to be
used, each speaker should have its own line.
8-OHM SPEAKERS
The loss in 100 feet of 18 gauge zipcord feeding one 8-ohm speaker is 15%. The loss for two 8-ohm speakers is
30%.
NOTE:
In any speaker installation, the total speaker load (the sum of all power to all speakers)
must not exceed 1000 watts per amplifier. The phonograph has an audio output
transformer assembly rated 250 watts (125 per channel) for connecting 70 V speakers,
tapping down the phonograph speakers, or connecting extension speakers to taps. The
sum of all power to 70 V speakers and tapped speakers must not exceed 250 watts.