The Technical Stuff
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Phantom Power
Most modern condenser microphones r48 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!
