Ashly CFT-1800 Manuel d'utilisation - Page 5

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Operating Manual - FTX-1001, FTX-1501, FTX-2001, CFT-1800 Power Amplifier

FTX-1001 FTX-1501 FTX-2001

Idle

.5A

loads

2 Amps

loads

3 Amps

loads

---

Table 3.1: Recommended AC line current capacity

All FTX Series III amplifiers consume less than

12 amps when operating at 1/8 power into 2

condition satisfies the UL, CSA and building electrical

code requirements for a piece of audio equipment not to

consume more than 80% of the current available when

plugged into a grounded 15 amp outlet and operated

at 1/8 of maximum power.

3.3

AC Grounding Requirements

To reduce the risk of ground loop hum, all sys-

tem ground references should originate at the same point

in your AC power distribution. Never remove the

amplifier's ground pin as it is both unlawful and danger-

ous, creating a potential shock hazard.

CABLE REQUIREMENTS

4.1

Input Cables

Be sure to use shielded cable whether balanced

or unbalanced. Shielding which is properly grounded will

protect the signal from outside electrical interference such

as RF, fluorescent lighting, even computer noise. As a

general rule, unbalanced or single-ended (tip-sleeve) lines

of less than 10 feet are satisfactory, but greater distances

may require a balanced signal. Avoid running input lines

in close proximity or parallel to long speaker lines, AC

power cables, or power transformers, as this may gener-

ate hum or oscillation.

4.2

Output Cables

The FTX Series III amplifiers are capable of de-

livering 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.

.6A

1.5A

2.5 Amps

3.5 Amps

4 Amps

6 Amps

7 Amps

10 Amps

loads. This

Since power at the speaker load is a primary con-

cern 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-con-

ductor cable. This table expresses the power loss as a

percentage of the load's power rather than the total am-

plifier output power, so that you can use this table to ac-

curately determine power loss to the load at other cable

lengths. For example, if you plan to deliver 100 watts to

an 8

load through 50 ft of 14 ga. cable, the power loss

in the cable would be 3.2%

1.6 watts lost in the cable. Table 4.1 also gives the resis-

tance per 100 feet of common copper wire gauges.

Wire Gauge

/100ft 8

Table 4.1: Percentage of speaker load power lost in 100

foot run of 2-conductor cable.

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 suffi-

ciently 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 supplemen-

tal 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 ac-

curate 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.

2 = 1.6% of 100 watts or

load 4

load 2

load