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70 Volt In Line Transformers are a device used in 70v Commercial Audio Systems.
A Commercial Audio System is comprised of amps,
speakers, volume controls, and a telephone system interface, depending on your
phone company set up. We carry a full line of speakers that already
have in line transformers mounted to them.
Conversely, you can also buy 70 volt transformers and connect them to a regular 8 ohm speaker. The 70v transformers that are used are step-down transformers that convert the high-voltage/low-current coming from the amplifier to the low-voltage/high-current signal that makes the speaker work. Each in line transformer usually has multiple wattage taps so that each speaker can be individually set as to how much wattage will enter the speaker, and, because of this, how loud each speaker will be. Some of these devices are like a rotary knob selector with which you can select the desired wattage, and some of them simply have a neutral wire and then several other wires, each representing a different wattage.
With a set up as such, one does not have to worry about keeping the impedance
matched throughout their music system as they would on an 8 ohm based system.
Impedance is a measure of resistance and in a 8 ohm system if you hook up too
many speakers to one amp the impedance will change to dangerous levels and potentially
destroy the amplifier. However, you can wire these speakers in parallel because
of the transformers, which regulate the wattage going into each of the speakers.
To calculate the wattage of the amp needed to run your system, simply take the
total wattage of all the taps on your speakers and include a 20% buffer, just
to be safe. Moreover, all the taps do not need to be set at the same wattage,
hence, you can thereby set a different volume for different speakers when the
amp is at one constant volume. Thus, with these devices a speaker in the hall
can be louder than one in an office or bathroom, this without using separate
volume controls or attenuators, or separate volume controls on the amp.
Purchase
at the GIN Electronics Custom Install Store
