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<blockquote data-quote="BJ James" data-source="post: 1969" data-attributes="member: 87">I have a couple 100 watt 70 volt transformers. There are no wires coming off it, just 5 tabs marked COM / INPUT4R / INPUT8R / OUTPUT100 watts / OUTPUT50 watts.My hope is to use these and grab a few more to temporarily convert some fullrange passive boxes to 70 volt operation. A PL340 is of a suitable voltage to drive a 70v system without a stepup transformer (confirmed with QSC). Just not sure how I would wire up these transformers as the ones I usually come across have clearly marked wires but are a lower wattage.Would this be right (although looks backwards according to the labelling)?&nbsp;&nbsp; (-) from the amp to the transformer COM then COM to the (-) speaker terminal. (+) from the amp to the OUTPUT100 watts tab(assuming I want 100 watts to the speaker) then from the INPUT8R to the (+) speaker terminal (assuming the speaker is an 8R box). Like I say, this seems to me to be correct, except for the labelling on the transformer. Thanks,BJ</blockquote>

[QUOTE="BJ James, post: 1969, member: 87"] I have a couple 100 watt 70 volt transformers. There are no wires coming off it, just 5 tabs marked COM / INPUT4R / INPUT8R / OUTPUT100 watts / OUTPUT50 watts. My hope is to use these and grab a few more to temporarily convert some fullrange passive boxes to 70 volt operation. A PL340 is of a suitable voltage to drive a 70v system without a stepup transformer (confirmed with QSC). Just not sure how I would wire up these transformers as the ones I usually come across have clearly marked wires but are a lower wattage. Would this be right (although looks backwards according to the labelling)? (-) from the amp to the transformer COM then COM to the (-) speaker terminal. (+) from the amp to the OUTPUT100 watts tab(assuming I want 100 watts to the speaker) then from the INPUT8R to the (+) speaker terminal (assuming the speaker is an 8R box). Like I say, this seems to me to be correct, except for the labelling on the transformer. Thanks, BJ [/QUOTE]

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