DESCRIPTION
Page 1
Thank you very much for choosing an ITC PRECISION SERIES amplifier. We are sure it will give
you many years of satisfying performance.
ITC power amplifiers of the PRECISION SERIES meet the stringent requirements of tough touring
applications. They are protected against over-temperature, overload, shorted outputs, radio freq-
uency interference and DC faults. The power transistors are protected from damage from reverse
feeding of electrical energy by means of an additional special protective circuit. For the so-called
soft-start, the power outputs are switched on delayed via relays. An inrush current limiter circuit
prevents the mains fuses from being blown.
Maximum precision is also guaranteed as regards mechanical construction and finish. The rob-
ust steel chassis features remarkable torsion resistance and-is specially designed to cope with the
tough wear and tear associated with going on tour. Thermal stability is guaranteed by several low
noise 3-stage fans which also means that they can be used inside the studio. Comparator circuits con-
stantly compare the power amplifiers' input and output signal and control the Iimiters under nonlinear
operating conditions.They protect the loudspeakers from overload due to power stage clipping. The
PRECISION S-ERIES power amplifiers feature excellent transmission properties. The power amp-
lifier topology also makes for extremely low distortion rates. Distortion factor (THD), intermod-
ulation distortion (SMPTEIM) and transient intermodulation distortion (DIM 30 and DIM 100) are
so low that they are only detectable with the most sophisticated measuring equipment.Generously
dimensioned power supplies with low-leakage toroidalcore transformers provide considerable head-
room well above the nominal ratings. V/I foldback limner circuits were deliberately not included in
the PRECISION SERIES power amplifiers to facilitate operation at complex loads up to a phase
angle of +/- 90.
The inputs are electronically balanced on XLR connectors. (Isolation transformers can be retrofi-
tted). Direct Outs in the form of XLR connectors (male), to loop the signal through, are also standard
features. The modes DUAL/Stereo can be selected via the Input Routing Switch. Furthermore, the
PRECISION SERIES power amplifiers can also be operated in "Bridged" mode.
The front panel accommodates the dB-calibrated input Gain controls which are designed as espe-
cially precise and safe-to-operate detented potentiometers. The LED display provides information
about the power amplifers' operating status. For the two channels, they demonstrate readiness to op-
erate, whether there is a signal at the input or output, when the Limiters have been activated and
whether one of the protective features has been triggered. The power outputs Channel A, Channel B
and Bridged Out are available on Speakon connectors. The rear side of the unit accommodates the
ON/OFF switches for the integrated Hi and Lo cut filters, a groundlift switch which separates the
housing from the circuit ground thus helping to prevent hum loops and the operating modes selector
to mono bridged operation. They also feature extremely quiet fans with front-to-rear airflow, facili-
tating operation in large and narrow amplifier racks.
This Owner's Manual is meant to help you familiarize yourself with all the PRECISION SERIES'
other features. Please read it through carefully and we guarantee that your new power amplifier of the
PRECISION SERIES from ITC will give you great pleasure.
