Electro-voice ELX-1A User Manual

ELX-1A

Rack-Mount Mic/Line
Mixer

• Four inputs, one output in a single
rack space

• Very-high-quality audio perfor­mance

• High reliability

• Extensive filtering circuitry and
shielding protect against rf
interference

• Power from 115/230-V ac or
external dc

• Transformer-isolated output

• Headphone output with separate
power amp and level control

• Switchable 1-kHz oscillator

• Switchable output limiter prevents
clipping

• 30-V phantom power

Description

The Electro-Voice ELX-1A mixer is a com­pact, high-performance audio mixer de­signed for professional applications where
clean audio and reliable operation are im­portant. Features and performance make the
ELX-1A ideally suited for broadcast and
production recording applications. The ELX­1A 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. Fig­ure 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
status.

TM

indicator shows power

• Switchable, low-distortion 1-kHz sine­wave 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 ac­cepts microphone and line-level inputs
via a mic/line switch.

• Circuitry incorporates rf filters and a bal­anced transformerless design for low dis­tortion 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.

output section features

• Transformer-isolated output with binding
posts.

• Transformer-isolated output with 3-pin
XLR-type connector and mic/line level­select switch.

• Headphone output, with separate power
amp and level control, can drive any head­phones or cue speaker.

• Auxiliary input jack is for fifth input or
for stacking additional mixers.

• Two stacking jacks are for interconnec­tion 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-

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tor

/4-inch phone jack.

• All other connections on the mixer are

ELX-1A Rack-Mount Mic/Line Mix er

two-conductor 1/4-inch phone jacks.

• All stacking and auxiliary inputs are line
level.

Architects’ and Engineers’
Specifications

The mixer shall have four transformerless
balanced input channels with rear-mounted
female 3-pin XLR-type connectors, switch
selectable for microphone or line-level
sources. Each input shall have the following
front-panel controls: LED clip indicator;
switchable low-cut filter with 6-dB-per-oc­tave slope at a corner frequency of 100 Hz;
and a rotary level control. Each balanced
input shall be enhanced with rf protection
circuitry. Each main input shall have 30-V

ELX-1A Rack-Mount Mic/Line Mix er

dc remote microphone power applied to pins
2 and 3, with a rear-mounted master phan­tom power switch.

There shall be a

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/4-inch phone jack auxil­iary input with the signal from this jack pro­vided to the mix bus. Stacking input and

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output

/4-inch phone jacks shall be provided

for the mix bus.
There shall be a single monaural output.

Output shall have a front-panel rotary level
control and a ten-segment LED peak pro­gram meter. Output shall be transformer iso­lated with two secondary windings. Output
connections shall be provided as follows:
dual binding posts for a transformer-isolated
output; male 3-pin XLR-type connector,
switch selectable for a microphone or line­level transformer-isolated output.

A chassis-ground connection shall be pro­vided on a rear-mounted binding post.

A headphone level control and a three-con-

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ductor

/4-inch jack shall be provided on the
front panel for headphones. The headphones
shall monitor the mix bus prior to the output
level control.

An internal oscillator with a front-panel
switch shall provide a 1-kHz sine-wave sig­nal to the mix bus. Sine-wave distortion of
the oscillator shall be <1.5%.

A limiter with a front-panel switch shall be
provided in the output amplifier circuitry
after the output level control. Limiter thresh­old shall be +14 dBu. Front-panel LED in­dicator shall light whenever limiting occurs.

A main power switch shall be located on the
front panel. The mixer shall operate on 115­or 230-V ac, 50/60 Hz, switchable on the
rear panel, and consume less than 12 watts.
The mixer shall also operate on 24-45-V dc
external power accessible through a rear­mounted Switchcraft 722A-type connector,
with a maximum external dc current draw
of 100 mA. A removable power cord and
rear-mounted IEC connector and fuse holder
shall be provided for ac operation. A front­panel LED indicator shall light steadily when
ac power is applied and flash when dc power
is applied, with the flash rate corresponding
to the supply voltage. The mixer shall be
operable over the temperature range of –
20°C (–4°F) to 60°C (140°F).

The mixer shall meet or exceed the follow­ing performance specifications: frequency
response from any input to any output, 30
Hz to 20 kHz, +0/–1 dB; total harmonic dis­tortion of less than 0.15% 20 Hz to 20 kHz
at +4 dBm output level and less than 0.15%
50 Hz to 20 kHz at +18 dBm output level;
equivalent input noise of 130 dBm (typical,
“A” weighted) with 150-ohm source and
maximum preamp gain; maximum voltage
gain of 91 dB (microphone input to main out­put); and common-mode rejection of 60 dB
at 20 Hz to 20 kHz. All switches shall be of
a positive-action push-button type. The cabi­net shall be made of black painted sheet metal
with a dark gray front panel, and have the
following dimensions: height, 4.45 cm (1.75
in.); width, 48.3 cm (19.0 in.); depth 21.0
cm (8.25 in.). The weight shall be 3.36 kg
(7.40 lb). The mixer shall be Electro-Voice
model ELX-1A.

Limited Warranty

Electro-Voice products are guaranteed
against malfunction due to defects in mate­rials or workmanship for a specified period,
as noted in the individual product-line
statement(s) below, or in the individual prod­uct data sheet or owner’s manual, beginning
with the date of original purchase. If such
malfunction occurs during the specified pe­riod, the product will be repaired or replaced
(at our option) without charge. The product
will be returned to the customer prepaid. Ex-
clusions and Limitations: The Limited

W arranty does not apply to: (a) exterior fin­ish or appearance; (b) certain specific items
described in the individual product-line
statement(s) below, or in the individual prod­uct data sheet or owner’s manual; (c) mal­function resulting from use or operation of
the product other than as specified in the
product data sheet or owner’s manual; (d)
malfunction resulting from misuse or abuse
of the product; or (e) malfunction occurring
at any time after repairs have been made to
the product by anyone other than Electro­Voice Service or any of its authorized ser­vice representatives. Obtaining Warranty
Service: To obtain warranty service, a cus­tomer must deliver the product, prepaid, to
Electro-Voice Service or any of its autho­rized service representatives together with
proof of purchase of the product in the form
of a bill of sale or receipted invoice. A list of
authorized service representatives is avail­able from Electro-V oice Service at 600 Cecil
Street, Buchanan, MI 49107 (800/234-6831
or FAX [phone]). Incidental and
Consequential Damages Excluded: Prod­uct repair or replacement and return to the
customer are the only remedies provided to
the customer. Electro-Voice shall not be li­able for any incidental or consequential dam­ages including, without limitation, injury to
persons or property or loss of use. Some
states do not allow the exclusion or limita­tion of incidental or consequential damages
so the above limitation or exclusion may not
apply to you. Other Rights: This warranty
gives you specific legal rights, and you may
also have other rights which vary from state
to state. Electro-V oice Electronics are guar­anteed against malfunction due to defects in
materials or workmanship for a period of
three (3) years from the date of original pur­chase. Additional details are included in the
Uniform Limited Warranty statement.

For warranty repair or service informa­tion, contact the service repair department
at: 616/695-6831 or 800/685-2606.

For technical assistance, contact Technical
Support at 800/234-6831 or 616/695-6831,
M-F, 8:00 a.m. to 5:00 p.m. Eastern Stan­dard Time.

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