Specifications

9
Damage due to bypassing the fuse or due to replacement of a fuse of higher ratings will
not be covered under the warranty. To access the fuse, insert the slotted screwdriver,
pushing to compress the internal spring and turn counterclockwise to unlock the housing.
The spring will then eject the fuse and the housing.
I Balanced XLR Input These inputs accept an XLR balanced connection from the preamp’s balanced outputs.
Note: The XLR pin configurations are as follows:
Pin#1- Ground
Pin#2- Positive
Pin#3- Negative
J Single Ended RCA These inputs accept an input signal from a single-ended output of a preamp or source
Non-Inverting Input that is in ....absolute phase or are used if it is desired to maintain the phase of the signal
from the preamp. Simply explained, this input does not invert the phase of the output sig-
nal relative to its input.
K Single Ended RCA These inputs accept an input signal from a single-ended output of a preamp or source
Inverting Input that is 180°out of phase relative to the original signal and correction for this configura-
tion is desired. The input on the Power 3 does invert the phase of the output signal, rela-
tive to the input signal.
L Input Selector Switch This switch must be rotated to the desired position to select the desired input, XLR
Balanced, RCA Single-Ended Non-Inverting (+) or Inverting (-) for normal operation. In
the MUTE position, this control allows for BIASING CONTROL of the power tubes and
for safe cable swapping without shutting down the amplifier. When in the M U T E p o s i t i o n
the front panel Power LED will turn R E D . Note: This position is purposely positioned at 12
o’clock so it can be easily determined when access is obscured. The front panel Power
LED will also turn red if this switch has selected an input which has no connection.
M Ground Post This post is offered for use when a ground connection is required (i.e. when amplifier’s
function is being tested by a technician). It has no use for day-to-day audio related
operation.
N Loudspeaker Binding Posts These posts are used to connect the amplifiers to the speakers; positive terminal to posi-
tive terminal, negative terminal to negative terminal.
WARNING: AMPLIFIER OUTPUT IS BALANCED.
CARE MUST BE TAKEN TO ENSURE THE AMPLIFIER IS NOT CONNECTED
TO LOUDSPEAKERS (CERTAIN SUBWOOFERS) OR LOUDSPEAKER SWITCH-
BOXES THAT HAVE A COMMON GROUND. CONSULT YOUR DEALER OR
SONIC FRONTIERS DIRECTLY FOR FURTHER CLARIFICATION REGARDING
CONNECTIONS TO ITEMS IN THESE UNIQUE CASES. DAMAGE TO THE
AMPLIFIER OR CONNECTED EQUIPMENT WILL NOT BE COVERED UNDER
WARRANTY IF THESE WARNINGS ARE IGNORED.