Dear Greg, 

70V systems are typically used for installations that require large amounts of speakers to be installed. The 70V transformer on each speaker allows you to have multiple lines of speakers connected to a single amplifier without the need to worry about impedance issues as you would get with an 8 ohm system.

So generally, we use 70V distributed systems when we have a large scale venue such as a shopping mall that requires coverage throughout the facility. We would install an 8 ohm system where high end performance is required, in venues such as a churches or amphitheaters, where we have greater control over speaker runs and amplifier distribution.

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Your Dr. Sound

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