IT-Reference 7 - Owner’s Manual
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connector located on the left hand side of the
rear panel (when facing the rear panel). Next
the male Edison plug must be connected
to an appropriate socket (see current rating
recommendation above).
c
onnectIng
c
omPonents
to
the
s
ymmetrIcal
P
oWer
b
anks
The IT-Reference 7’s four “Symmetrically
Balanced Power Outlets” should be employed for
critical video components such as DVD players,
projectors, Plasma, or LCD video screens.
These outlets are not recommended for most
receivers, power amplifiers or powered sub-
woofers, due to potential current compression
when employing an isolation transformer to
supply AC power. See your authorized Furman
dealer or Furman Customer Service when
attempting to use the IT-Reference 7 to defeat
a ground loop. There are typically many options
that will work. For example, if a subwoofer is
added to a system, and hum results, it may
be possible to eliminate the buzz by using the
IT-Reference 7 on one of the pre-amplifiers,
satellite receivers or processors that feed the
subwoofer its signal.
s
oFt
s
tart
- c
ontInuous
u
se
and
b
reak
-I
n
t
Ime
When power is first applied to the IT-Reference
7, (the front panel breaker- power toggle must
be switched to the “on” position) the Soft Start
feature is activated. There is an audible “clack”
when the IT-Reference is first turned on or off.
This sound is produced by the Soft Start circuit’s
30 Amp relay engaging or disengaging. There
is virtually nothing in the IT-Reference 7’s
construction, design, or componentry to wear
over the life time of the product, and there is
no power draw from your electric service meter
aside from the LED power indicator, relay, and
GFCI protection circuit. For this reason the IT-
Reference 7 may be left with its power engaged
permanently at a cost of pennies per month. This
is an added benefit, as many audio/videophiles
find performance improves significantly when
leaving low-powered components permanently
charged (turned on). In fact, this is true of the IT-
Reference 7. Though it will function flawlessly
right from its shipping carton, the performance of
its circuit parts will improve after approximately
two weeks of continuous use or “break-in.”
g
round
F
ault
I
nterruPter
(gFcI)
The IT- Reference 7’s four “Discrete Symmetrical
Filtered AC outlets” incorporate a symmetrically
balanced AC power output, whereby both the
neutral and positive leads of the AC cable run
at 60 Volts AC in opposing polarity, referenced
to ground (0 Volts AC). This is but one of the IT-
Reference 7’s advantages over other AC-filter/
protection designs.
Even though virtually all domestically produced
electronic equipment are designed to detect
electrical shorts and other potentially dangerous
equipment problems in the line lead referenced
to its Neutral, this is inadequate when power
is “balanced.” With the IT-Reference 7’s
symmetrical outlets, both neutral and positive
legs contain 60 VAC relative to their Ground tab.
This is not a problem or safety hazard, unless
there is a defect in either the IT- Reference 7’s
transformer, or the power supply of a connected
component. In this instance, we need to assure
that safety is always maintained. The solution is
our GFCI (ground fault circuit interrupter).
The Furman GFCI detects any imbalance in the
current flowing in the two hot legs. The missing
current is presumed to be flowing through the
ground conductor (the round pin on an AC outlet).
Ground current often indicates a dangerous
partial or full short circuit. If an imbalance is
detected, the GFCI will trip the outlets internal
breaker, and the Duplex AC outlet will no
longer supply AC power of any sort. To restore
operation, correct the fault, press the reset tab
located between the two black balanced AC
Summary of Contents for IT-Reference 7
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