Mackie M800 Bedienungsanleitung PDF herunterladen (Seite 13)

13

If you’re using low imped-

ance loads at high power

levels, we recommend that

you use the binding post

speaker outputs rather

than the 1/4" TS jacks. Al-

though 1/4" jacks and plugs are convenient and

easy to use, they are not designed to handle

high-level currents.

Make sure that the amplifier is off before

making connections or reconfiguring the signal

routing.

INPUT

The M•800 gives you a choice of inputs — it

has XLR as well as 1/4" TRS (Tip-Ring-Sleeve)

input jacks. Sonically (and electrically) they’re

identical, so choose either one. Since these two

inputs are in parallel, don’t use both at the same

time.

The amplifier expects to see a nominal sig-

nal level anywhere between the –10 dBV

“semipro” and +4 dBu “pro” standards, mean-

ing almost any line-level mixer or other device

can be plugged into the amp’s

INPUT

s. Use the

GAIN

controls to adjust the gain of the ampli-

fier to match the signal level you’re using.

Each type of input can be used with either

balanced or unbalanced signals.

Balanced

Use the balanced connections if your source

has balanced outputs. This will greatly reduce

any noise picked up in your system.

When connecting a balanced signal using

the XLR or 1/4" jacks, they’re wired thusly, per

AES (Audio Engineering Society) standards:

XLR TRS

Hot (+) Pin 2 Tip

Cold (–) Pin 3 Ring

Shield (Ground) Pin 1 Sleeve

2

2

3

1

1

SHIELD

COLD

HOT

SHIELD

COLD

HOT

3

SHIELD

COLD

HOT

3

2

1

TIPSLEEVE

TIP

SLEEVE

SLEEVE (SHIELD)

TIP (HOT)

RING (COLD)

SLEEVE (SHIELD)

TIPSLEEVE

TIP (HOT)

RING (COLD)

RING

TIP

SLEEVERING

Balanced

1

⁄

4

" TRS Plug

Unbalanced 1/4" TS Plug

Balanced XLR Plug (prior to Lunar orbit insertion)

Unbalanced

Unbalanced TS (Tip-Sleeve) lines can be

accommodated via the TRS jack. Make sure

the cord terminates with a TS plug (like a gui-

tar plug), or if it’s a TRS plug (like a

headphone plug), make sure the ring is tied to

the shield, preferably at the source end.

THRU

The

THRU

jacks allow you to feed the input

signal to the inputs of other amplifiers. In this

way, multiple amplifiers can receive an input

signal from your single mixer or preamp. This

is accomplished as follows:

• Make sure all your equipment is turned

off before making any connections.

• Plug the signal source outputs into the

first amp’s

INPUT

s.

• Patch from that amp’s

THRU

jacks to the

next amp’s

INPUT

, and so on, daisy-chaining to

other amps in your system (assuming your

mixer has low impedance outputs).

To prevent excessive loading

of your source, a general rule

of thumb is to maintain a

load impedance 10 times or

more than the source imped-

ance . If your console has an

output impedance of 100 ohms, then you can

daisy-chain up to twenty M•800 amplifiers,

which presents a load of 1000 ohms to the con-

sole (input impedance of 20 kohms divided by

20 amplifiers = 1000 ohms).

The

THRU

jacks can also be used to relay

the input signals on to other devices such as a

DAT or cassette recorder. They are wired in

parallel with the XLR and TRS

INPUT

s, so the

signals coming out of the

THRU

jacks are ex-

actly the same as the signals going into the

amp, unaffected by any of the amp’s switches

and controls.

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