Electro-Voice ELX-1A Manual

Description

The Electro-Voice ELX-1A mixer is a com-
pact, high-performance audio mixer de-
signed for professional applications where
clean audio and reliable operation are im-
portant. Features and performance make the
ELX-1A ideally suited for broadcast and
production recording applications. The ELX-
1A can mount in a single rack space or set
on any surface. Extensive rf filtering circuitry
and shielding provide protection against rf
interference.
The block diagram is shown in Figure 1. Fig-
ure 2 shows the front and rear panels.

General Features

• Optimum circuit design provides flat
frequency response, low distortion and
low noise.
• Space-saving, compact design uses
only one rack space (1.75 in.).
• Powerable from ac line or external
dc source, with automatic switchover;
detachable line cord.
• Electro-Pulse indicator shows power
TM
status.
• Switchable, low-distortion 1-kHz sine-
wave oscillator facilitates level calibration.
• Ten-segment, three-color PPM LED
bargraph meter shows peak output level
and has clip indicators; can be converted
internally to VU characteristics.
• Switchable output limiter prevents
clipping; yellow LED lights when
limiting action occurs.
Input Section Features
• A single 3-pin XLR-type connector ac-
cepts microphone and line-level inputs
via a mic/line switch.
• Circuitry incorporates rf filters and a bal-
anced transformerless design for low dis-
tortion and high signal quality.
• Switchable 30-volt phantom power is
available at microphone inputs.
• Input controls set gain of preamps for
optimum noise performance with any
input signal.
• LED indicator at each input lights if c
lipping occurs.
• Low-cut filters switchable at each input
reduce low-frequency microphone
handling and background noise.
ELX-1A ELX-1A ELX-1A
ELX-1A ELX-1A
Rack-Mount Mic/Line Mixer Rack-Mount Mic/Line Mixer Rack-Mount Mic/Line Mixer
Rack-Mount Mic/Line Mixer Rack-Mount Mic/Line Mixer
• • • • • Four inputs, one output in a single Four inputs, one output in a single Four inputs, one output in a single Four inputs, one output in a single Four inputs, one output in a single
rack space rack space rack space rack space rack space
• • • • • V V V V V ery-high- ery-high-quality audio performance ery-high- ery-high- quality audio performance quality audio performance quality audio performance
ery-high- quality audio performance
• • • • • High reliability High reliability High reliability
High reliability High reliability
• • • • • Extensive filtering circuitry and Extensive filtering circuitry and Extensive filtering circuitry and Extensive filtering circuitry and Extensive filtering circuitry and
shielding protect against rf shielding protect against rf shielding protect against rf shielding protect against rf shielding protect against rf
interference interference
interference interference interference
• • • • • P P P P P ower from 115/230- ower from 115/230- ower from 115/230- ower from 115/230-V ac or external ower from 115/230- V ac or external V ac or external V ac or external V ac or external
d c d c d c d c d c
• • • • • T T T T T ransformer ransformer-isolated output ransformer ransformer -isolated output -isolated output -isolated output
ransformer -isolated output
• • • • • Headphone output with separate Headphone output with separate Headphone output with separate Headphone output with separate Headphone output with separate
power amp and level control power amp and level control
power amp and level control power amp and level control power amp and level control
• • • • • Switchable 1-kHz oscillator Switchable 1-kHz oscillator Switchable 1-kHz oscillator Switchable 1-kHz oscillator Switchable 1-kHz oscillator
• • • • • Switchable output limiter prevents Switchable output limiter prevents Switchable output limiter prevents
Switchable output limiter prevents Switchable output limiter prevents
clipping clipping clipping
clipping clipping
• • • • • 30- 30-V phantom power 30- 30- 30- V phantom power V phantom power V phantom power V phantom power
output section features
• Transformer-isolated output with binding
posts.
• Transformer-isolated output with 3-pin
XLR-type connector and mic/line level-
select switch.
• Headphone output, with separate power
amp and level control, can drive any head-
phones or cue speaker.
• Auxiliary input jack is for fifth input or
for stacking additional mixers.
• Two stacking jacks are for interconnec-
tion with additional mixers, and can be
modified for insert patching.

Connections

• All mic/line inputs have female 3-pin
XLR-type connectors. Pin 2 is positive;
pin 3 is negative.
• The transformer-isolated outputs have a
male 3-pin XLR-type connector and dual
binding posts.
• The headphone output is a three-conduc-
tor 1 / -inch phone jack.
4
• All other connections on the mixer are