The Current Audio R70VT adapts our 8 Ohm speakers for use with multi-speaker 70-volt commercial distributed public address and sound systems. It features a high power, low insertion loss, wide frequency response quality line matching design.The transformer has multiple primary taps of 30-16-8-4 watts with the secondary at 8 Ohms.The transformer is constructed of audio caliber laminations. It has a very low insertion loss and has a frequency response of 40-16kHz.The unit has two mounting holes for easy attachment to locations on the speaker or any hard surface.With our limited 5 year warranty you are assured years of superior trouble-free operation.