QSC MX-1000a Bedienungsanleitung PDF herunterladen (Seite 11)

VI. LONG-TERM OUTPUT

POWER

In a properly designed sound system, you can usually

obtain the desired sound level without using the full

output power of the amplifier; if the “CLIP” indicators flash

once in a while, that is perfectly normal.

If the amplifier is operated at extremely high power levels,

it may overheat or may even damage the speakers. The

amount of stress on the amplifier depends largely on the

load and how hard the amplifier drives it. In general, the

lower the load impedance, the more stressful the load is.

8-Ohm Loads

The amplifier can operate at practically any power level

without risk of overheating. However, if it is pushed hard

enough to continually light the “CLIP” indicator, the

amplifier’s average output power can reach 250 to 800

watts (depending on the model), which is more than

many speakers can handle.

4-Ohm Loads

If the “CLIP” indicator flashes occasionally, the amplifier

is approaching its maximum long-term power capacity. If

it is lit about half the time, the amplifier channel will

probably go into thermal protection within a few minutes.

2-Ohm Loads

Except for an occasional flash, keep the “CLIP” indicator

dark to avoid overheating the amplifier channel.

AC CURRENT CONSUMPTION

A major objective in the design of the MXa Series

amplifiers—even the highest-powered models—is to

permit their operation from readily available, standard

AC power sources. The MX 3000a can deliver 1600 watts

per channel into 2-ohm loads—a total of 3200 watts—yet

its rated current draw under “normal conditions” is less

than 12 amperes at 120 volts AC, which is 1440 watts.

How is this possible? First, “normal conditions” in power

amplifier rating means operation, using pink noise as a

source, at an average power level equal to one-eighth of

maximum power. This is recognized by most of the

world’s safety agencies as the loudest you can play

music through an amplifier and still keep the incidence of

clipping to a reasonable minimum. An amplifier’s peak

current draw at full output power into 2 ohms is several

times what the “normal” draw is, but its various protection

circuits will prevent this condition’s lasting more than a

minute or two.

When you plan the AC power hookups for your amplifi-

ers, use Table 2 to predict the current requirements per

amplifier. You can use the one-eighth power figures to

predict the normal continuous current draw, then add a

safety margin to allow for occasional crescendos.

Table 2: Current requirements, in amperes, at 120 VAC under various conditions (divide by 2 for 220–240 VAC operation):

MX 1000a

MX 1500a

MX 2000a

MX 3000a

8+8

4+4

2+2

275 x 2

400 x 2

500 x 2

5.5

7.5

8+8

4+4

2+2

400 x 2

600 x 2

750 x 2

5.5

6.5

8+8

4+4

2+2

475 x 2

725 x 2

1000 x 2

9.5

7.5

8+8

4+4

2+2

850 x 2

1300 x 2

1600 x 2

9.5

AC Current

@ Full power

Output

powerLoad

MODEL

AC Current

@ 1/3 power

AC Current

@ 1/8 power

AC Current

@ Idle

1 2 ... 6 7 8 9 10 11 12 13 14 15 16

Kommentare zu diesen Handbüchern

Keine Kommentare

QSC MX-1000a Bedienungsanleitung Seite 11

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Audioverstärker QSC MX-1000a