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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 options 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-induced hum noise. The transformer input also further reduces any common- 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 stereo 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 channels 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 input option are single in-line package (SIP) resistor networks which allow preselection between standard crossover frequencies of 160Hz, 500Hz, 750Hz, 1.2KHz, and 1.6KHz. 360° of phase control is provided for proper acoustical alignment of high and low frequency drivers. 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 inputs 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 control and selectable stereo, mono and bridging modes. Insert Points are available for patching external processing into the left and right channels. Operating Manual - FTX-1001, FTX-1501, FTX-2001, CFT-1800 Power Amplifier 9. TYPICAL APPLICATIONS 9.1 Stereo Operation (Both switches out, both inputs used, both level controls used, both outputs used) 9.2 Parallel Mono Operation (Parallel mono switch in, channel 1 input used, both level controls used, both outputs used) Operating Manual - FTX-1001, FTX-1501, FTX-2001, CFT-1800 Power Amplifier 9.3 Bridged Mono Operation (Normal/bridging switch in, channel 1 input used, channel 1 level control used, BRIDGED output used) 10. DESIGN THEORY Ashly FTX Series III amplifier circuits are totally discrete using high-voltage, wide bandwidth electronics. The input section is a complimentary Darlington differential amplifier stage for high common-mode rejection, low noise and low distortion. All voltage gain stages in the amplifier operate class A for low distortion. The complimentary MOSFET output stage has almost infinite current gain, therefore the output driver stages are nearly lossless. All circuitry within the feedback loop is discrete which allows the amplifier to recover instantly and cleanly without any spikes or glitches from a clipped condition. This overall design approach inherently assures low noise, low distortion, and excellent transient and overload response. Inputs are bridging and active balanced, and all input connections can operate as balanced or unbalanced. The MOSFET output devices themselves do not require short circuit protection and V.I. limiting circuitry; however, output relays are employed for turn-on delay and speaker protection from fault conditions. The output relays will open if DC voltage, ultrasonic signals, a shorted output, or an internal amplifier failure is detected. Any of these fault conditions will illuminate the protect mode LEDs on the front panel. Each amplifier channel operates completely independent of the other so that one channel in protect mode will not affect the other channel. Designed into the FTX Series III and CFT amplifiers is the hardware necessary for computer control and monitoring as such systems become available. All electronic components are mounted to rugged plated-through glass-epoxy circuit boards. Large computer-grade electrolytic capacitors assure long service. The FTX Series III amplifiers are packaged in a rugged 16-gauge steel chasses. The power transformer is located at the front center of the chassis to minimize front panel torsion. Each channel’s electronics and heat sink are identical yet completely independent and modular, each with a single plug-in connector for ease of servicing. Large custom black-anodized extruded alum...

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