Mackie DFX12 Manuel d'utilisateur télécharger pdf (Page 22)

22

16.1" (410 mm)

4.1" (105 mm)

14.4" (365 mm)

DFX•12

WEIGHT

10.0 lbs.

(4.5 kg)

DFX•6

WEIGHT

8 lbs.

(3.6 kg)

11.8" (300 mm)

14.4" (365 mm)

The majority of AC outlets encountered in

homes and clubs (in the U.S.) are served by a

240 VAC center-tapped service entrance trans-

former. This provides two phases of AC power

on either side of the center tap, at 120 V each.

If lighting is used in a show, it is preferable

to power the lights from one leg of the service,

and power the audio equipment from the

other leg. This will help minimize noise from

the lights coupling into the audio (particularly

if SCRs, or light-dimmer switches, are used).

In order to minimize ground loops, the

safety grounds for all the outlets should be

connected to a common (“star”) grounding

point, and the distance between the outlets

and the common grounding point should be as

short as possible.

When setting up for a show, oftentimes you

are plugging into an AC power distribution sys-

tem you know nothing about. You may even be

faced with 2-wire outlets that are missing the

third safety ground pin. It’s a good idea to have

a three-wire AC outlet tester in your toolbox so

you can check the outlets yourself to make

sure they are wired correctly. These testers

will tell you if the polarity of the hot and neu-

tral wires is reversed and if the safety ground

is disconnected. Don’t use an outlet if it is

wired improperly! This is to protect yourself as

well as your equipment.

If you find that you must plug into a two-

wire outlet, you will need to use a two-wire to

three-wire adapter (cheater plug). These

come with a metal tab that you put under-

neath the center screw that holds the AC

outlet faceplate in place. This center screw

must be grounded. You can check it by con-

necting the adapter to the outlet and then

plugging in your handy-dandy AC outlet tester.

NEVER bypass the AC plug’s

ground pin. This is

dangerous!

AC Power Considerations

Dimensions

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