The center line, labeled, “%,” presents the
same information as above, but displayed
as a percentage. Therefore, a 120 volt
input should read 100%.
The bottom line, labeled “Energy Storage,”
indicates the accepted voltage range to
achieve normal operation.
During loud passages, or if your AC line
temporarily sags, you may witness some
degree of fluctuation in the meter. If the
needle consistently resides somewhere
outside the accepted Energy Storage
range, you may elect to have an electrician
check your line voltage to ensure proper
operation of the Classic 250.
As discussed in the Front Panel: Power
section, a yellow meter indicates standby
and a solid blue meter indicates full op-
eration. If the amplifier experiences a
problem, for example a short circuit or
over-voltage, the C250 will go into its fault
protect mode. This status is indicated by
the meter display
flashing blue
. If you
ever encounter this situation with your
C250, first check to make sure that all con-
nections are seated properly. Then turn off
and unplug the C250 from the wall, allow-
ing its circuitry to reset and power it back
up. If the amplifier is still indicating the
fault mode, please refer to the back of this
manual for service.
Back Panel: Inputs
There are two sets of inputs to choose
from, single-ended (RCA) and balanced
(XLR).
The single-ended RCA connections are
a very high quality, gold plated connec-
tor designed specifically for PS Audio
components. The balanced XLR con-
nector is easily identifiable as the larger
connector with three individual pins. The
C250 is a fully balanced design, thus use
of the balanced XLR inputs is the optimal
choice.
Stereo Input: Whether you are using a
pre-amplifier or a source component with a
built in processor, you will want to ensure
that the left output from that equipment
matches the “Left” of the C250 and like-
wise for the “Right.” Be sure to use the
inputs in matched pairs for example, use
both RCA inputs or both XLR inputs, but
never one of each.
Mono Input: If you intend to use your
C250 in mono mode, which will require
one Classic 250 amplifier per speaker, you
must first switch the input selector on the
right channel to Mono. This deactivates
the right channel input. The left channel
connectors are now used for making input
connections while in mono. These instruc-
tions are also indicated on the back panel
in red text.
Back Panel: Outputs
There are four pairs of speaker terminals
on the back of the C250. Two pairs are
situated on the left channel side and two
pairs are situated on the right channel
side. There are two pairs of outputs per
channel for easier bi-wire connections
to your loudspeakers. Both pairs output
the exact same signal for their respective
channels, right or left.
The C250 uses WBT five-way binding
posts able to accept a spade, banana,
spade and banana, pin or straight wire.
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