Bedienungsanleitung Mackie SRM 150 (Seite 8 von 20) (Englisch)

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FRONT PANEL DESCRIPTION

Plugging a guitar straight into a

typical line-level input can result in

the loss of gain, especially at high

frequencies, resulting in a dull sound.

Normally, you must use a direct box

between a guitar and a mixer’s or preampliﬁer’s input,

which serves to convert the impedance of the guitar

from high to low. The Instrument input on channel 1

makes the need for a direct box unnecessary. It’s like it

has its own built-in direct box!

However: The Instrument input is unbalanced, so if you

are running a long cord between the instrument and the

SRM150 (say over 20 feet), it is best to use a direct box

with a balanced output to avoid picking up noise over

the length of the cord.

5. 48V PHANTOM POWER Switch and

Indicator

Most professional condenser microphones require phan-

tom power, which is a low-current DC voltage delivered

to the microphone on pins 2 and 3 of the XLR micro-

phone connector. Push in the 48V button if your micro-

phone requires phantom power. An LED lights next to

the button to indicate that phantom power is active.

Most of the connections and controls on the SRM150

are located on the front panel for easy access.

1. MIC/LINE Inputs

Channels 1 and 2 have combo connectors, which

accept balanced microphone inputs from an XLR

connector, or balanced and unbalanced line-level inputs

from a 1/4" TRS or TS connector.

The XLR inputs are wired as follows:

Pin 1 = Shield or ground

Pin 2 = Positive (+ or hot)

Pin 3 = Negative (– or cold)

The 1/4" inputs are wired as follows and will accept

both balanced and unbalanced inputs:

Sleeve = Shield or ground

Tip = Positive (+ or hot)

Ring = Negative (– or cold)

2. Stereo Input

Channel 3 has a pair of RCA connectors, which accept

a stereo line-level input from a CD player or MP3 player

(or any other line-level device).

3. Channel Gain Controls

These are used to adjust the signal level for each

individual channel. Since the SRM150 incorporates

Mackie’s world-class low-noise mic preamp technology,

you can connect either a line-level or a microphone-level

signal to the input, and use this control to adjust the

level correctly.

Follow the Quick Start guide on page 4 for setting

the gain controls. For most applications, it will be in

the 12 o’clock position. If you have a particularly high

line-

level signal connected to the SRM150, you may

need to turn the control down to the 9 o’clock position.

If you have a low line-level or mic-level signal con-

nected, you may need to turn the gain control up to the

3 o’clock position.

4. INSTRUMENT Switch (CH 1)

Push in this button to change the 1/4" line input

on channel 1 to an instrument input. When the but-

ton is out, the 1/4" input accepts normal line-level

signals from low-impedance sources. When the button

is pushed in, the 1/4" input accepts high-impedance

signals from instruments with electric pickups, which

you would normally run through a DI box.

HIGH

12kHz

MID

2.5kHz

LOW

100Hz

MAXMIN

+15-15

MAXMINMAXMIN

MAXOFF

LEVEL

MIC/LINE

PHANTOM POWER

INSTRUMENT (CH 1)

48V

SRM150

MAIN

COMPACT ACTIVE PA SYSTEM

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Mackie SRM 150 Seite 8

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