Ashly MFA-8000 Operating Manual - Page 5

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1. Specifications

Operating Manual - MFA-8000 and MFA-6000 Power Amplifier

peaking at the clipping level, the following AC line cur-

rent capacities are recommended for system design pur-

poses:

Load

MFA-6000

Idle

1 Amp

7.5 Amps

10 Amps

15 Amps

Table 3.1: Recommended AC line current capacity

Both MFA amplifiers consume less than 12 amps

when operating at 1/8 power into 2

tion satisfies the UL, CSA and building electrical code

requirements for a piece of audio equipment not to con-

sume more than 80% of the current available when plugged

into a grounded 15 amp outlet and operated at 1/8 of maxi-

mum power.

3.3

AC Grounding Requirements

To reduce the risk of ground loop hum, all system

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 dangerous, 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 MFA 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 deliv-

ered to the speaker. It will also result in a decrease in the

damping factor and possible fire hazard.

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

MFA-8000

which would be lost in an arbitrary 100 ft run of 2-con-

ductor cable. This table expresses the power loss as a per-

1.2 Amps

centage of the load's power rather than the total amplifier

10 Amps

output power, so that you can use this table to accurately

15 Amps

determine power loss at other cable lengths. For example,

20 Amps

if you plan to deliver 100 watts to an 8

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.

Wire Gauge

loads. This condi-

Table 4.1: Percentage of speaker load power lost in 100

foot run of 2-conductor cable.

5.1

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

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 amplifier for cooling purposes. Ther-

mal output of the amp is measured in max BTU/hour for

typical audio program material when both channels are

just peaking at the clipping level.

Table 5.1: Maximum BTU/hour

Since power at the speaker load is a primary con-

100ft

load

.0605

0.8%

.1018

1.3%

.1619

2.0%

.2575

3.2%

.4094

5.1%

.6510

8.1%

RACK-MOUNTING REQUIREMENTS

Mechanical

All Ashly amps are designed to fit in standard 19-

Cooling

Be certain that both the front and back of the rack

Load

MFA-6000

Idle

420

1900

2300

4140

load through 50

load

1.5%

3.0%

2.5%

5.1%

4.0%

8.1%

6.4%

12.9%

10.2%

20.5%

16.3%

32.6%

MFA-8000

500

2420

3450

4830