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 to-
uring applications. They are protected against over-temperature, overload, shorted outputs,
radio frequency 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
robust 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. Comp-
arator circuits constantly compare the power amplifiers' input and output signal and control the
Iimiters under non-linear operating conditions.They protect the loudspeakers from overload due
to power stage clipping. The PRECISION S-ERIES power amplifiers feature excellent transmi-
ssion properties. The power amplifier topology also makes for extremely low distortion rates.
Distortion factor (THD), intermodulation distortion (SMPTEIM) and transient intermodulation
distortion (DIM 30 and DIM 100) are so low that they are only detectable with the most sophis-
ticated measuring equipment.Generously dimensioned power supplies with low-leakage toroidal
-core transformers provide considerable headroom 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 re-
trofitted). 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. Fur-
thermore, 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
especially precise and safe-to-operate detented potentiometers. The LED display provides in-
formation about the power amplifers' operating status. For the two channels, they demonstrate
readiness to operate, 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 out-
puts 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 ex-
tremely quiet fans with front-to-rear airflow, facilitating 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.
( PAGE 1 )
DESCRIPTION:
DESCRIPTION
