valutazioni - 2, GPA: 4 ( )

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Avoid running input lines in close proximity or parallel to long speaker lines, AC power cables, or power transformers, as this may generate hum or oscillation. 4.2 Output Cables The FTX Series III amplifiers are capable of delivering high levels of output current, therefore the wire gauge used for speaker cables is particularly important. Inadequate wire gauge adds significant resistance to the speaker’s own impedance, reducing the power which is actually delivered to the speaker. It will also result in a decrease in the damping factor and possible fire hazard. Since power at the speaker load is a primary concern in system design, we have included a table to best determine appropriate wire gauge for your application. Table 4.1 lists the percentage of the speaker load power which would be lost in an arbitrary 100 ft run of 2-conductor cable. This table expresses the power loss as a percentage of the load’s power rather than the total amplifier output power, so that you can use this table to accurately determine power loss to the load at other cable lengths. For example, if you plan to deliver 100 watts to an 8W load through 50 ft of 14 ga. cable, the power loss in the cable would be 3.2% . 2 = 1.6% of 100 watts or 1.6 watts lost in the cable. Table 4.1 also gives the resistance per 100 feet of common copper wire gauges. Wire Gauge W/100ft 8W load 4W load 2W load #8 .0605W 0.8% 1.5% 3.0% #10 .1018W 1.3% 2.5% 5.1% #12 .1619W 2.0% 4.0% 8.1% #14 .2575W 3.2% 6.4% 12.9% #16 .4094W 5.1% 10.2% 20.5% #18 .6510W 8.1% 16.3% 32.6% Table 4.1: Percentage of speaker load power lost in 100 foot run of 2-conductor cable. 5. RACK-MOUNTING REQUIREMENTS 5.1 Mechanical All Ashly amps are designed to fit in standard 19-inch racks. The front panel rack-mount ears are sufficiently strong for most applications. If you desire further integrity for mobile racks, we recommend using the four additional holes in the back of the chassis for supplemental rear-mounting (see dimensional drawings). 5.2 Cooling If using an FTX amplifier, be certain that both the front and back of the rack have unhindered access to free air flow. Fan direction is from front to back. It is not necessary to leave empty space above or below the FTX amplifiers, however the CFT-1800 will cool more efficiently with space above and below the chassis. The following chart indicates max BTU per hour for each amp under varying load conditions, so that accurate assessment of room ventilation needs can be made. Thermal output is approximated by subtracting audio output power from the total power consumption of the amplifier. All values assume the amplifier is driving both channels and just peaking at the clipping level. Operating Manual - FTX-1001, FTX-1501, FTX-2001, CFT-1800 Power Amplifier AC Power Off On Output Channel One Channel Two -1-18 -21 -24-27 -1-18 -21 -24-27 FTX-1001 FTX-1501 FTX-2001 Idle 210 BTU 250 BTU 620 BTU 8W loads 550 BTU 580 BTU 760 BTU 4W loads 800 BTU 970 BTU 1340 BTU 2W loads --2030 BTU 2590 BTU Table 5.2: Max BTU per hour (both channels driven) 5.3 Grounding In some installations where the sound system is sensitive to RF noise or system-induced oscillation, it may be necessary to ground the amplifier's chassis to the rack enclosure. This is accomplished using star type lockwashers on the four rack mounting screws. These star washers will penetrate through the amplifier's paint to adequately ground the chassis to the rack. 6. FRONT PANEL FEATURES 6.1 Power Switch When the unit is switched on there is a 2 second delay, during which time the PROTECT circuit will activate. The load is disconnected during this power-up sequence . When turning off the amplifier, the load is removed instantly, and the protect LED will briefly turn on as the power supply discharges. 6.2 Thermal Status Meters This left-most green LED, when turned on, indicates normal thermal status. If either amplifier channel overheats, these lights will both turn off, indicating that power has been cut off from the audio portion of the amplifier. The AC Power Switch will remain lit, and the cooling fan continues to operate until the amplifier is within safe operating temperatures again. Operating Manual - FTX-1001, FTX-1501, FTX-2001, CFT-1800 Power Amplifier Stereo MOSFET Power Amplifier vel FTX-2001 FTX SERIES III Protect Protect Clip -3-6-92 -3-6-92 Clip 6.3 Output Meters Output meters display peak output voltage in dB, Turn-on delay/Instant turn off referenced to full output. For example, if full output in a given configuration was 400 watts, then “0” would mean DC voltage at the output (signals below 8 hertz the amp is delivering the full 400 watts to the load, “-6” will be interpreted as DC voltage, and may trig- would mean the output voltage is 6dB lower, or 100W. ger the protect circuit) 6.4 Clipping Indicator Output short circuit Clipping occurs when the signal peak levels extend beyond the available power supply rails, essentially Ultrasonic signals at high amplitude “cutting ...

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