AR-15
AC LINE VOLTAGE REGULATOR
AND
POWER CONDITIONER
VOLTAGE
REGULATORS
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AR-15 VOLTAGE REGULATOR / POWER CONDITIONER
5. Clean theAR-15 with a damp cloth only. Do not voltage, plus or minus five volts. Voltages ap-
use solvents or abrasive cleaners. Never pour
any liquid on or into the unit.
proximately ±10% beyond that range may be
converted to usable levels, depending on the
requirements of the equipment. This stable
voltage protects equipment and allows optimal
performance. See graphs on the back page.
6. When left unused for a long period of time,
the power cord of the AR-15 should be un-
plugged from the outlet.
The AR-15 has eight outlets on the rear panel,
and one convenience outlet on the front panel.
All are functionally interchangeable. The outlets
are regulated, surge-suppressed, and linearly
filtered, making the unit a full-function power
conditioner. The AR-15 has no controls except
an on-off switch and the switch for the optional
rear rack light.
7. The AR-15 should be serviced by qualified
service personnel when:
a. The power supply cord or the plug has
been frayed, kinked, or cut.
b. Objects have fallen or liquid has spilled
into the unit.
c. The AR-15 has been exposed to rain or
other moisture.
d. The AR-15 does not appear to operate
normally or exhibits a marked change in
performance.
e. The AR-15 has been dropped, or the
enclosure damaged.
Note: The AR-15 is for use with AC voltage
only. DC voltages should never be applied to
them. Also, it does not change or regulate line
frequency. The output frequency will always be
the same as the incoming frequency.
8. The AR-15 requires that a safety ground be
present for proper operation. Any attempt to
operate the AR-15 without a safety ground
is considered improper operation and could
invalidate the warranty.
SMP+ (series mode protection plus)
Traditional surge suppression rely on circuits
that “sacrifice” themselves when exposed to
multiple transient voltage spikes, requiring the
dismantling of your system, and repair of your
surge suppressor. Not so with SMP+. With
Furman’s SMP+, damaging transient voltages
are safely absorbed, clamped, and dissipated.
No sacrificed parts, no service calls, no down
time.
9. There are no user serviceable parts in the
AR-15. Refer servicing to qualified service
personnel only.
Voltage Regulation
Furman Voltage Regulators are intended to
protect sensitive electronic equipment from
problems caused by AC line voltage irregu-
larities—brownouts or overvoltages that can
cause audio tonal changes, digital equipment
malfunction (such as loss of MIDI programs or
other data), or, in extreme cases, permanent
damage. They accept input voltages over a
wide AC voltage range and convert them to a
steady, stable output at the desired standard
Unique to Furman’s SMP+ is its unparalleled
clamping voltage. While other designs offer
clamping voltages that are well above 330 Vpk,
Furman’s SMP+ clamps at 188 Vpk, (133 VAC
RMS). This unprecedented level of protection
is only available with Furman’s SMP+ technol-
ogy. Additionally, Furman’s trusted over-volt-
age circuitry protects against all too frequent
2
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AR-15 VOLTAGE REGULATOR / POWER CONDITIONER
accidental connections to 208 or 240 VAC, by
shutting off the incoming power until the over
voltage condition is corrected.
NOTE: If the mains power is above the high
cutoff voltage and has caused the unit to
remove power from its outlets, it cannot restore
power without the operator manually turning
the unit off, then on again. Avoid turning the
unit back on, without first checking the source
of the problem, and perhaps changing the AC
LiFT (Linear Filtering Technology)
Unfortunately, traditional AC filter - condition-
ers have been designed for unrealistic labora-
tory conditions. Prior technologies, whether
multiple pole filter or conventional series
source.
Protection OK Indicator
mode, could actually harm audio and video
performance more than they help, due to the
resonant peaking of their antiquated, non-lin-
ear designs. Under certain conditions, these
designs can actually add more than 10 dB of
noise to the incoming AC line! Furman’s SMP+
with LiFT takes another approach, ensuring
optimal performance through linear filtering
and no leakage to ground. With this exclusive
filtration technology, all connected equipment
will be free of noise and contamination and will
operate at optimum performance levels.
Although the Furman SMP+ circuit assures
virtually protection from transient voltage
spikes and surges, nature has a way of
occasionally creating electrical forces that are
beyond the capabilities of any TVSS device to
absorb without some degree of damage. In
the rare instance that this occurs, the green
“Protection OK” LED indicator located on your
front panel will dim. If this happens some level
of protection from voltage surges will remain,
but the Furman’s clamping voltage rating will
be compromised. The unit must be returned
to Furman Sound, or an authorized Furman
Service center for repair.
Extreme Voltage Shutdown Indicator
This LED is normally off. It monitors a hazard
common in the entertainment industry: wiring
faults – for example, accidental connection
to 220VAC where 120VAC is expected, or an
open neutral from a 208 or 240VAC feed. The
Series II SMP+ circuit senses voltages that
are so high that operation would be impossible
and shuts the power down before damage
can occur. Upon initially applying power to
these units, the Extreme Voltage indicator
LED will light if the input voltage is above the
extreme voltage cutoff, and power will not be
applied to the unit’s outlets. If the unit has been
operating with an acceptable input voltage
and subsequently that voltage exceeds 145-
150V, it will shut off power to the outlet and the
Extreme Voltage LED will light.
FUSES AND CIRCUIT BREAKERS
There is one fuse and one circuit breaker in the
AR-Series. In the event that the unit appears to
be completely dead (neither the Power switch
nor any LED’s light up), unplug the power cord
and the load and check the breaker. If the cir-
cuit breaker is tripped, a white button will pop
up. Push it back in to reset it. The purposes of
these circuit protection devices are:
1. A fast-blow 15 amp circuit breaker is acces-
sible at the rear panel without removing the
unit from the rack. This breaker will trip if the
unit’s 15 amp capacity is exceeded at any
time.
2. A fast-blow 1/4 amp fuse is located inside
3
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AR-15 VOLTAGE REGULATOR / POWER CONDITIONER
the unit. This fuse will blow if the unit has
been connected to a voltage that is above
the range of the Extreme Voltage Shut-
down circuitry. To replace it, the unit must
be completely disconnected from all power
and removed from its rack. The six hex head
screws and two Phillips head screws holding
the top cover must be removed. The internal
fuse is located in a holder on the printed circuit
board. Replace the fuse only with the exact
same type (1/4 fast blow).
that the other equipment will be disrupted by
leakage of a strong 50/60 Hz magnetic field.
Nevertheless, suggested rack locations would
be either at the top or bottom.
As with any rackmount equipment, be sure to
use 10-32 machine screws for mounting in the
rack’s tapped holes (this is not a metric size).
In particular, beware of 10-24 screws, which
may fit if forced but which will strip the threads.
To avoid marring the front panel finish, use
plastic washers under the screw heads.
INPUT VOLTAGE MONITORING
DESIGN
The row of ten LED’s at the left of the front
panel make up a meter that indicates INPUT
VOLTAGE. Only one LED will light up at a time.
There are two red LED’s at the endpoints. When
lit, they indicate that the input voltage may
be above or below the point where it can be
restored to the selected nominal output volt-
age (though it may still be restored to a usable
level) but is not high or low enough to cause an
extreme voltage shutdown.
The AR-Series uses a design based on an
eight-tap toroidal autoformer. The toroidal de-
sign assures minimal leakage of stray magnetic
fields, and, because of its high efficiency, a very
compact size for its rating. The Voltage Regula-
tor’s circuitry monitors the incoming line voltage
with each cycle, comparing it to an extremely
precise voltage reference, accurate to ±0.15%.
If a voltage fluctuation requires that a different
tap be selected, the new tap is electronically
switched exactly at the zero-crossing, to avoid
distorting the AC waveform. If necessary, it can
switch taps as often as once each cycle. Most
commercial voltage regulators using multiple-
tapped transformers switch taps at uncontrolled
times, thereby creating voltage spikes and
clicks that can leak into the audio! Hysteresis in
the switching circuits avoids “chatter” or unnec-
essary switching back and forth between adja-
cent taps. Unlike those voltage regulators that
employ ferro-resonant transformers, Furman
Voltage Regulators are not sensitive to small
errors in line frequency, making them ideal for
use with generators.
OUTPUT VOLTAGE MONITORING
A green LED labelled OUTPUT IN REGULATION
indicates proper function (i.e., that the output volt-
age is within ±5V of the selected output voltage).
Your equipment will always work normally when
this light is on, and often will work satisfactorily
even when it is off.
The AR-15 offers a 10-LED bargraph line voltage
meter to monitor the incoming line (the Voltage
Regulator output).
INSTALLATION
Because of their toroidal transformer design,
Furman Voltage Regulators may be posi-
tioned near most other equipment without fear
MAXIMUM AND MINIMUM LOAD
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AR-15 VOLTAGE REGULATOR / POWER CONDITIONER
The AR-15 can handle loads totalling up to 15
amperes as long as the input voltage is equal
to or above 124 volts. For voltages below that
level, its capacity must be derated at approxi-
mately 113 milliamperes per volt. (See graphs
volts. Though they are usually of very short du-
ration, the energy they contain can be consid-
erable, enough to damage sensitive solid-state
components in audio and computer equipment.
Spikes can also foul switch contacts and de-
on back page.) As a practical matter, therefore, grade wiring insulation. They are an unavoid-
to cope successfully with worst-case brown-
out conditions, you should plan your total load
so that it does not exceed 12 amps, or 1400
watts. Please note that this refers to the ag-
gregate power requirement of all equipment
able component of electric power. They are
caused unpredictably by electric motors switch-
ing on or off (on the premises or outside), utility
company maintenance operations, nearby
lightning strikes, and other factors. Spikes (also
plugged into the Voltage Regulator, not to each called surges or transients) are absorbed by
individual item.
special components called MOV’s in the AR-
series to provide safe voltage levels to protect
your equipment.
NOTE: While there is no minimum load require-
ment for the AR-15 you may experience an
audible mechanical hum coming directly from the
unit when the POWER switch is on with nothing
plugged in. This effect will sometimes disappear
RFI/EMI INTERFERENCE: Noise from RFI
(Radio Frequency Interference) or EMI (Electro
Magnetic Interference) involves lower voltages
as soon as you plug in any equipment drawing 40 and less energy than is found in spikes, but it is
to 50 watts total.
continuous rather than transient in nature. It is
not likely to cause physical damage, but it can
certainly be annoying, producing static in audio
circuits, “snow” on video screens, or garbled
data in computers. Noise can be introduced into
AC lines by nearby radio transmitters, certain
kinds of lighting, electric motors, and others.
Because noise occurs at higher frequencies
than the 50 or 60 Hz AC line, it can be effective-
ly reduced through use of low-pass filtering.
DEFINITIONS
VOLTAGE REGULATION: The AC line voltage
is a number indicating the nominal electrical
potential that has been adopted in a region
for powering electrical equipment of all kinds.
In most of North America it is 117 volts AC; in
Japan, 100 volts; and in many other countries
220, 230, or 240 volts. The actual voltage can
fall below or rise above this nominal level due
to brownouts, power cutbacks, use of substan-
dard wiring, and other causes. These devia-
tions can cause poor performance or a mal-
function. A regulator is a device which, through
use of a transformer, corrects the voltage
deviation by stepping it up or down so that it is
as close as possible to the nominal level.
THREE-YEAR LIMITED WARRANTY
Furman Sound, Inc., having its principal place
of business at 1997 South McDowell Blvd.,
Petaluma, CA 94954 (“Manufacturer”) warrants
its AR-15 (the “Product”) as follows:
Manufacturer warrants to the original Purchaser
of the Product that the Product sold hereunder
will be free from defects in material and work-
manship for a period of three years from the
SPIKE: A pulse of energy on the power line.
Spikes can have voltages as high as 6000
5
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AR-15 VOLTAGE REGULATOR / POWER CONDITIONER
date of purchase. The Purchaser of the product
zation from Furman Sound. This warranty also
is allowed fifteen days from the date of purchase does not apply to Products upon which repairs
to complete warranty registration by mail or on-
line at the Furman website. If the Product does
not conform to this Limited Warranty during the
warranty period (as herein above specified),
Purchaser shall notify Manufacturer in writing of
the claimed defects. If the defects are of such
type and nature as to be covered by this war-
ranty, Manufacturer shall authorize Purchaser
to return the Product to the Furman factory or to
an authorized Furman repair location. Warranty
claims should be accompanied by a copy of the
original purchase invoice showing the purchase
date; this is not necessary if the Warranty Regis-
tration was completed either via the mailed in
warranty card or on-line website registration.
Shipping charges to the Furman factory or to
an authorized repair location must be prepaid
by the Purchaser of the product. Manufacturer
shall, at its own expense, furnish a replacement
Product or, at Manufacturer’s option, repair the
defective Product. Return shipping charges
back to Purchaser will be paid by Manufacturer.
have been affected or attempted by persons
other than pursuant to written authorization by
Manufacturer.
THIS WARRANTY IS EXCLUSIVE. The sole
and exclusive obligation of Manufacturer shall
be to repair or replace the defective Product in
the manner and for the period provided above.
Manufacturer shall not have any other obligation
with respect to the Products or any part thereof,
whether based on contract, tort, strict liability or
otherwise. Under no circumstances, whether
based on this Limited Warranty or otherwise,
shall Manufacturer be liable for incidental,
special, or consequential damages. Manufac-
turer’s employees or representatives’ ORAL OR
OTHER WRITTEN STATEMENTS DO NOT
CONSTITUTE WARRANTIES, shall not be
relied upon by Purchaser, and are not a part of
the contract for sale or this limited warranty. This
Limited Warranty states the entire obligation of
Manufacturer with respect to the Product. If any
part of this Limited Warranty is determined to be
void or illegal, the remainder shall remain in full
force and effect.
THE FOREGOING IS IN LIEU OF ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO THE IM-
PLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PUR-
POSE. Manufacturer does not warrant against
damages or defects arising out of improper
or abnormal use of handling of the Product;
against defects or damages arising from im-
proper installation, against defects in products
or components not manufactured by Manufac-
turer, or against damages resulting from such
non-Manufacturer made products or compo-
nents. This warranty shall be cancelable by
Manufacturer at its sole discretion if the product
is modified in any way without written authori-
6
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SERVICE
Before returning any equipment for repair,
please be sure that it is adequately packed
and cushioned against damage in shipment,
and that it is insured. We suggest that you
save the original packaging and use it to
ship the product for servicing. Also, please
enclose a note giving your name, address,
phone number and a description of the
problem.
�
NOTE: All equipment being returned for
repair must have a Return Authorization
(RA) Number. To get an RA Number, please
call the Furman Service Department, (707)
763-1010, ext. 120 or 121, between 8 a.m.
and 5 p.m. U.S. Pacific Time, or fax to (707)
763-1310. Please display your RA Number
prominently on the front of all packages.
10 dB @ 10 kHz
40 dB @ 100 kHz
SPECIFICATIONS
100 dB @ 10 MHz
Spike Protection Modes:
Linear attenuation curve from 0.05 - 100 ohms line impedance
Line to neutral, zero ground leakage
Shutdown Range:
Spike Clamping Voltage:
Above 145 - 150VAC typically
188 Vpk @ 3,000 amps, 133 VAC RMS
(tested to UL-1449 6,000 Vpk @ 3,000 amps)
Dimensions:
Response time:
19 “ W x 11.63”D x 1.75”H
(48.26 x 29.54 x 4.45 cm)
1 nanosecond
Weight:
Maximum surge current:
14.5 lbs. (6.58 kg)
6,500 amps
Current Rating:
Voltmeter Accuracy:
The AR-15 II is capable of 15 amps for input voltages
of 124V (104V in 100V mode) or higher; derate at 113
mA per volt to a minimum of 12:3A
±5V
“In Regulation” Ranges:
Three Year Limited Warranty:
AR-15 II: Provides regulation ±5V in 120V mode from
97 to 141V
The AR-15 is protected by a limited three-year warranty covering defects
in materials and workmanship.
Noise attenuation:
Furman Sound, Inc. • 1997 South McDowell Blvd. • Petaluma, CA 94954-6919 USA
Made in China
12/17/04-C
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