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Operating Manual - FTX-1001, FTX-1501, FTX-2001, CFT-1800 Power Amplifier
8. INPUT OPTIONS
Input option panels are available to provide built-in features
such as a stereo compressor-limiter, a mic and line mixer, a crossover
for bi-amplified systems, and input transformers for signal isolation.
In addition to the FTX amplifiers, input options can be installed on
MFA High-Power amps, the CFT-1800 convection cooled amp, and P70
series 70 volt amps. A brief description of currently stocked input op-
tions follows. Consult your dealer for detailed information on input
options, or call the factory at 800-828-6308.
8.1 Input Isolation Transformer (not shown)
The input transformer provides complete electrical isolation
from the amplifier and its signal source to eliminate any ground-in-
duced hum noise. The transformer input also further reduces any com-
mon-mode noise and radio frequency interference. The transformer
option is factory installed in a standard input panel and does not change
the operation of any switches or controls.
8.2 Peak Limiter/Compressor
The limiter input option provides peak signal limiting from
excessive input levels for speaker protection and overall level control.
Separate limiter threshold controls, limit indicator LED’s and limit on/
off switches are provided on each channel allowing fully discrete ste-
reo limiting operation.
8.3 Two-Way Crossover
The crossover input option provides fixed-frequency 24 dB/
octave high-pass and low pass filters allowing the two amplifier chan-
nels to operate bi-amped, full range with low out, both channels low
out, or bridged low out. Auxiliary low and high outputs are available
for connecting additional amplifiers. Included with the crossover in-
put option are single in-line package (SIP) resistor networks which al-
low preselection between standard crossover frequencies of 160Hz,
500Hz, 750Hz, 1.2KHz, and 1.6KHz. 360° of phase control is pro-
vided for proper acoustical alignment of high and low frequency driv-
ers. Selectable constant directivity horn EQ is provided for both small
and large horn designs.
8.4 Six Input Mic-Line Mixer
The mixer input option provides four high-impedance line in-
puts and two balanced low-impedance microphone inputs, each with its
own level control. A switchable 200 Hz high-pass filter is provided on
the mic inputs to reduce unwanted low frequency noise. An internal
jumper allows selection of 15 Volt phantom power applied to the mic
inputs for use with condenser mics. The option has a master level con-
trol and selectable stereo, mono and bridging modes. Insert Points are
available for patching external processing into the left and right chan-
nels.