Universal-audio LA-610 Mk II User Manual download pdf (Page 29)

The Technical Stuff

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Phantom Power

Most modern condenser microphones require +48 volts of power to operate. When delivered over a

standard microphone cable (as opposed to coming from a dedicated power supply), this is known as

“phantom” power. The LA-610 provides such power when the Phantom switch is in the on (up)

position ( see #5 on page 5), applying 48 volts to pins 2 and 3 of the mic’s output connector.

While, in theory, this should result in no harm to the connected microphone even if it does not require

phantom power (since pins 2 and 3 are out of phase and therefore cancel one another at the

microphone), problems can occur if the shield (pin 1) is broken or if the connection is made such that

both signal pins do not make simultaneous contact. Even if all is good, the application of phantom

power can often result in a loud pop (transient). For these reasons, we strongly recommend that the

the LA-610 Phantom switch be left in its off (down) position when connecting and disconnecting

microphones. Only turn the Phantom switch on if you are certain that the connected microphone

requires 48 volts of phantom power. If in doubt, consult the manufacturer’s manual for that

microphone.

Maintenance Information

Meter Calibration

The LA-610 will likely never need meter recalibration. No external trim is available with the MK II.

However, in the event the meter needs trimming for any reason, an internal trim is available.

 WARNING! Due to high voltages and risks of electrocution and even death, the LA-610’s

internal components are considered non-serviceable, and it is highly recommended that the

unit be returned to Universal Audio for any service needs. The user agrees that any self-

service is done at the user’s own risk!

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Universal-audio LA-610 Mk II User Manual Page 29