Furman Sound IT-20 II User Manual

IT-20 II - Owner’s Manual

Fe at ur es

Ultra-low noise balanced isolation transformer provides over 80 dB of common noise reduction form

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20Hz - 20kHz, assuring the lowest noise oor possible for today’s sensitive recording equipment

Toroidal transformer assures contained magnetic eld, allowing any component to operate in close

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proximity without inducing noise

GFCI protected outlets with Ground Lift switch to eliminate AC hum and ground induced noise

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Furman’s Linear Filtering Technology (LiFT) provides well over 40 dB of differential mode noise

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reduction from 100kHz-1Ghz for unequalled audio clarity

Series Multi-Stage Protection Plus (SMP+) for virtually maintenance-free protection from surges and

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spikes. No sacriced parts, no service calls, no downtime!

Automatic Extreme Voltage Shutdown (E.V.S.) will power down equipment during a prolonged and /

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or extreme over-voltage situation

20 amp capacity with 12 ultra-low resistance isolated-ground Hubbel AC outlets, plus two front panel

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convenience outlets

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IT-20 II - Owner’s Manual

In t r o d u c t I o n

Thank you for your purchase of a Furman IT-

20 II 20 amp Balanced Power Conditioner,

and congratulations on your choice. This
specially wound and shielded toroidal isolation
transformer is designed specically to reduce
hum pickup by sensitive equipment when ultra-

low-noise is a must.

de s c r I p t I o n

Designed for the most critical, ultra-low noise

installations, the IT-20 II can supply 20 amps

of Balanced AC power for recording studios,
broadcast stations, or video production facilities.
To understand the incredible need for clean
noise-free AC power, it’s important to note that

today’s sophisticated studio equipment features
tremendous dynamic range. Most of the signal
content that denes high resolution such as
harmonics, instrument timbre, high frequency

extension, spatial cues, and fast transient

attacks in audio are inherently low in signal

level. Further, when AC noise is induced into

audio processors, pre-ampliers, microphones,

powered monitors, computers, and mixing
consoles, the all important low level signals are
distorted or masked. Once signals are masked

there is no way to retrieve the lost content.
Advanced AC ltering is critical when audio or

video resolution is at stake. With Furman’s IT-20

II, for the rst time you will hear audio content
and see video images as they were meant to be

- pristine. Add to this our SMP+ non-sacricial

surge suppression, E.V.S. protection, Linear

Filtering Technology (LiFT), and laboratory grade
digital voltmeter and you will be assured that AC

noise and surges are a thing of the past.

In s ta ll at I o n

The power source to which the IT-20 II is

connected must be adequate for use at 20 amps.

We recommend a 30 amp circuit, wired with
10 gauge wiring, if continuous operation near

20 amps is anticipated. A dedicated (nothing
else connected) 20 amp circuit is the minimum
acceptable to comply with NEC requirements.
Consult a qualied electrician if in doubt. The IT-

20 II is designed for mounting in a standard 19

inch equipment rack. Because of its weight, the

best position for it is the bottom slot of the rack.
Its toroidal transformer minimizes magnetic
leakage, but nevertheless, due to its high

capacity, it will radiate an appreciable magnetic
eld. Therefore, we recommend that it not be

positioned adjacent to sensitive, low level signal

processors, especially mic preamps, mixers,
tape recorders, etc. Power amps may be more

suitable “rack neighbors.”

The maximum benet is derived from balanced
power when it powers ALL equipment in an
installation. Therefore, try to position the IT-20
II in a central location so its power can be easily
distributed everywhere it’s needed. If the total
power consumption of all equipment exceeds 20

amps at 120 volts, delete high level or mechanical

devices rst (such as power amps, motors). If
possible, physically isolate any equipment that

has to be powered with conventional power
through a different circuit, and route their AC

cords away from all other cabling. The balanced
power produced by the IT-20 II is restricted to
use with electronic equipment only. Balanced
power may not be used for lighting equipment,
and access must be limited to use by qualied
personnel only.

If you are installing the IT-20 II in a rack that
has rear as well as front mounting rails, you may

wish to order adjustable rear rack ears from
Furman. These allow the IT-20 II to be securely
attached in both the front and back. Order model
RRM-2.

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