|The AR-20 II delivers a stable stream of AC power to protect
equipment from problems caused by AC line voltage irregularities such as
sags, brownouts, or over-voltages - all of which can cause sensitive
electronic equipment to malfunction or sustain damage. Featuring a
generous 20 amp capacity, the AR-20 II accepts any input voltage from
97V to 137V and transforms it to a constant 120V. Voltages beyond this
range are also converted to usable levels, unless they are extremely far
out of range, in which case the unit will automatically power down to
prevent equipment damage.
Additionally, the AR-20 II is the only 20 amp regulator that filters
and purifies AC power, reducing line noise linearly and ensuring optimum
performance. Your equipment will perform at optimum levels and will be
fully protected from spikes and surges by Furman’s exclusive SMP+
technology. This virtually maintenance-free surge suppression system
incorporates Linear Filtering Technology (LiFT), Extreme Voltage
Shutdown (E.V.S.), and high current TVZ MOVs to provide the highest
level of power protection available - all without the need for servicing
or replacement of the unit. Just install it in your rack and forget
Many competitive voltage regulators use noise-inducing, motorized
transformer-based technology. This results in large, expensive, and less
reliable units which cannot match the level of performance delivered by
the AR-20 II. Essentially, Furman’s advanced technology allows us to
offer superior performance in a cost effective unit.
The AR-20 II’s circuitry monitors the incoming line voltage with
each cycle, comparing it to an extremely precise voltage reference,
accurate to ±0.15%. The design is not sensitive to small errors in line
frequency, making it ideal for use with generators. If a voltage
fluctuation requires that a different tap be selected, the new tap is
switched electronically at the zero-crossing, to avoid distorting the AC
waveform. (Most commercial voltage regulators usingmultiple-tapped
transformers switch taps at uncontrolled times, thereby creating voltage
spikes, and often creating clicks that can leak into the audio.)
The AR-20 II has twelve outlets on the rear panel and two convenience
outlets on the front panel. All outlets are regulated, spike-suppressed,
and filtered against radio frequency and electromagnetic interference.
The twelve rear outlets are divided into two separate banks with
bi-directional filtering for either analog or digital components. There
are no controls except for the on-off switch. A digital meter indicates
input voltage, while another LED indicates ﾓIn Regulation" status (i.e.,
that the output voltage is within ﾱ5V of 120V). The unit is housed in a
compact, dual-space rack mount chassis, 3.5" high and 17.125" deep with
rack ears (14.125" deep without rack ears).
Because of its 20 amp rating, the AR-20 uses a special AC plug.
SMP+ (Series Multi-Stage Protection Plus)
Furmanﾒs SMP+ surge suppression virtually eliminates service calls.
Traditional surge suppression circuits 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ﾒs SMP+, damaging transient voltages are safely absorbed, clamped
and dissipated - no sacrificed parts, no service calls, no down time.
Unique to Furmanﾒs SMP+ is its unparalleled clamping voltage, even
when tested beyond the grueling specifications of - USA/CIDAﾒs A-1-1
test. While other designs offer clamping voltages that are well above
300VAC peak (far beyond long accepted professional standards), Furmanﾒs
SMP+ clamps at 188VAC peak, 133 VAC RMS even when tested with multiple
6000VAC - 3000 Amp surges! This unprecedented level of protection is
only available with Furmanﾒs SMP+ technology.
LiFT (Linear Filtering Technology)
Unfortunately, traditional AC filter/conditioners have been designed for
unrealistic laboratory conditions. Prior technologies could actually
harm audio and video performance more than they help, due to the
resonant peaking of their antiquated, non-linear designs. Under certain
conditions, these designs can actually add more than 10 dB of noise to
the incoming AC line! Worse still, lost digital data, the need to reboot
digital presets, or destroyed digital converters are frequently caused
by excessive voltage spikes and AC noise contaminating the equipment
ground. Furmanﾒs SMP+ with LiFT takes another approach, ensuring optimal
performance through linear filtering and no leakage to ground.
E.V.S. (Extreme Voltage Shutdown)
Furmanﾒs trusted overvoltage circuitry protects against all too frequent
accidental connections to 208 or 240VAC by shutting off the incoming
power until the overvoltage condition is corrected.