Origin Acoustics D81T Transformer (6 Pack)

D81T Transformer (6 PACK)

70/100-Volt systems are advantageous when the design calls for multiple speakers from the same amplifier and/or long-distance wire runs. The Origin Acoustics 70V/100V loudspeakers feature multiple taps off the transformer adjusted by a rotary switch on the crossover board at the back side of the speaker.. The higher the wattage selected the more output will be generated by the speaker.
Please note, 70V is common in the U.S. while 100V is the common voltage in Europe.
A simple calculation is used to determine how many speakers can be driven on a single amplifier channel. First, for safety purposes, it is recommended to make the calculations based on 80% of the amplifiers rated power. For example, a 500-watt amplifier would safely deliver 400 watts of usable power (500 x 0.8 = 400). Now it is simply a matter of dividing 400 by the tap setting of the speakers.
For example, if the speakers are set at a 10w tap, the amplifier would be capable of driving 40 speakers per channel. At a 20w tap that would be 20 speakers. At a 5w tap that would be 80 speakers and so on.
As you can see, if you need coverage over a wide area and it requires numerous speakers, a 70V/100V system presents a tremendous advantage. However, it should be noted that the higher the wattage tap, the higher the fidelity and the greater SPL that can be delivered from each speaker. Therefore, it is best to determine the total number of speakers needed and set the taps as high as possible within the amplifier’s power output rating.
As mentioned, the rotary switch used to adjust the tap setting is located at the back side of the speaker. It is best to leave the grilles off until all of the tap settings have been properly adjusted.
Also note that there is an 8 Ω setting that bypasses the transformer entirely. Use caution to avoid this setting when connected to a 70V/100V amplifier as this can destroy the loudspeaker.
The tap setting determines how much wattage each speaker will draw from the amplifier. When daisy-chaining multiple speakers, add the combined wattage of all tap settings to determine the wattage draw on the amplifier. The combined total wattage should never exceed the wattage rating of the amplifier.