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Operating Manual - SRA-120 Power Amplifier

4.2

Output Cables

The wire gauge used for speaker cables is impor-

tant, in that inadequate wire gauge adds significant re-

sistance to the speaker's own impedance, reducing the

power which is actually delivered to the speaker. It also

results in a decrease in the damping factor and possible

fire hazard.

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.

2 = 1.6% of 100 watts or

load 4

load 2

load

RACK-MOUNTING REQUIREMENTS

5.1

Mechanical

All Ashly amps are designed to fit in standard

19-inch racks. Avoid placing the amp immediately next

to devices which are sensitive to heat or magnetic fields

(high-gain preamps, magnetic data storage, etc.)

5.2

Cooling

The SRA-120 will cool more efficiently with

space above and below the chassis, although most appli-

cations will not require this.

The following chart indicates maximum BTU per

hour under varying load conditions, so that accurate as-

sessment of room ventilation needs can be made. Ther-

mal output is approximated by subtracting audio output

power from the total power consumption of the ampli-

fier. All values assume the amplifier is driving both chan-

nels and just peaking at the clipping level.

Idle

40 BTU

loads

200 BTU

loads

320 BTU

Table 5.2: Maximum BTU per hour (both channels driven)

5.3

Grounding

In some installations where a 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.

5.4

Security Covers

For installations where it is desirable to protect

the front panel level controls from tampering or acciden-

tal misadjustment, use an Ashly security cover. Installa-

tion is simple and does not require removal of the equip-

ment from your rack. See your Ashly dealer for details.