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The following diagrams illustrate various wiring set ups for 4 ohm, 8 ohm and 70 Volt operation.
SZ Series Connections
8 Ohm Operation (One 8 Ohm speaker per amplifer)
8 Ohm 8 Ohm
4 Ohm 4 Ohm
4 Ohm Operation (Two 8 Ohm speakers per amplifer)
70 Volt Operation (Four speakers per amplifer with their line transformers set to 25 watt)