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Preliminar y, Installation, cont’d – Extron Electronics MLS 406SA User Manual

Page 18

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Installation, cont’d

MLS 304 Series, MLS 406 Series • Installation

2-10

PRELIMINAR

Y

The Preamp connector outputs a variable, line level audio signal for

use with a powered amplifier or self-powered speakers. The volume

can be controlled (attenuated) via the front panel knob or RS-232

communication. The volume range is 0 (mute) through 100.

Lineout and Preamp outputs can be set up as

unbalanced, -10 dBV (-7.8 dBu, 0.316 Vrms, default)

for consumer level

devices such as VCRs, DVD players, and stereo receivers

or

balanced, +4 dBu (+1.8 dBV, 1.228 Vrms)

for professional devices such

as mixers, signal processors, and power amps

depending on how the connector is wired and how the MLS is set up (via the

control software). See the following wiring diagrams and chapter 4, Serial

Communication

.

Unbalanced Stereo Output

Tip

NO GROUND HERE.

Sleeve(s)

Tip

NO GROUND HERE.

Balanced Stereo Output

Tip

Ring

Sleeve(s)

Tip

Ring

L

R

L

R

L

R

L

R

Unbalanced Mono Output

Balanced Mono Output

Tip

NO GROUND HERE.

Sleeve

Tip

Ring

Sleeve

Left

Right

Left

Right

Left

Right

Left

Right

CAUTION

For unbalanced audio, connect the sleeve(s) to
the center contact ground.

DO NOT

connect

the sleeve(s) to the negative (-) contacts.

C

Connect the sleeve to ground (Gnd). Connecting the sleeve to a negative
(-) terminal will damage the audio output circuits.

N

For mono output, wire either the left or the right side, not both.

C

Do not bridge mono outputs. The left and right input signals are
summed, and each mono output channel carries the same combination
signal.

N

If the output is wired for balanced output, the level is +6 dB higher than the
level for unbalanced output wiring. The balanced/unbalanced level difference
occurs no matter which line level output setting is chosen via RS-232. See
page 4-10.

N

After the audio inputs and outputs are connected, see chapter 3,

Operation

and Setup for instructions on how to adjust the per-input audio sensitivity

levels and optimize Lineout and Preamp output.

N

If the Loudness feature is turned on, the gains for bass and treble frequencies
are affected for all outputs whenever volume is adjusted.

Amplified output (MLS 304MA, MLS 406MA only)

— Cable speakers to this

5-position screw terminal for a mono amplified audio output. This provides a

mono output signal even if the input is a stereo signal. For stereo output, use

the non-amplified Lineout and Preamp outputs instead.

The 4 ohm/8 ohm direct connection circuit and the 70 V/100 V transformer

connection are mutually exclusive: only one circuit (direct or transformer) can

be active at a time.

C

Do not short the terminals to ground or the amplifier will be damaged.

C

Do not bridge mono outputs. Bridging could damage the amplifier.

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