Rack-Mount Mic/Line
• Four inputs, one output in a single
rack space
• Very-high-quality audio performance
• High reliability
• Extensive filtering circuitry and
shielding protect against rf
• 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
• 30-V phantom power
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
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-PulseTM 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
• 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.
• 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-conductor 1/4-inch phone jack.
• All other connections on the mixer are
ELX-1A Rack-Mount Mic/Line Mixer
two-conductor 1/4-inch phone jacks.
ELX-1A Rack-Mount Mic/Line Mixer
• All stacking and auxiliary inputs are line
Architects’ and Engineers’
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
dc remote microphone power applied to pins
2 and 3, with a rear-mounted master phantom power switch.
There shall be a 1/4-inch phone jack auxiliary input with the signal from this jack provided to the mix bus. Stacking input and
output 1/4-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-conductor 1/4-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. Exclusions and Limitations: The Limited
Warranty 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-Voice Service at 600 Cecil
Street, Buchanan, MI 49107 (800/234-6831
or FAX 616/695-4743). 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-Voice 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.
ELX-1A Rack-Mount Mic/Line Mixer
Figure 1—Block Diagram
ELX-1A Rack-Mount Mic/Line Mixer
ELX-1A Rack-Mount Mic/Line Mixer
ELX-1A Rack-Mount Mic/Line Mixer
Figure2—Front and Rear Views
Equivalent Input Noise (mic input, maximum gain, 150-ohm source, “A”
–130 dBm, typical
0 dBu = 0.775 V rms.
0 dBm = 1 mW into 600 ohms (0.775 V
across 600 ohms).
Measurements are referred to a 1-kHz,
0-dBu sine-wave input unless noted.
Measurement bandwidth is restricted to
30 kHz unless noted.
Load impedance is 600 ohms unless
Frequency Response, Any Input to Any
Output (0-dBm output, 500-kHz measurement bandwidth):
£ –82 dBm
Master at Nominal:
£ –81 dBm
Master Full Up:
£–68 dBm
Maximum Voltage Gain, ±2 dB,
Mic Input to Main Output:
91 dB
Mic Input to Headphone Output:
30-20,000 Hz, +0/–1 dB
Total Harmonic Distortion Plus Noise,
82 dB
Mic Input to Stacking Output (modified
for insert patching):2
Mic/Line Output,
+4 dBm, 20-20,000 Hz:
63 dB
Common-Mode Rejection, 20-20,000 Hz:
+18 dBm, 50-20,000 Hz:
60 dB, typical
Stacking or Headphone
+18 dBm, 20-20,000 Hz:
Output Noise, Inputs Down, “A”
Weighted, Master Down:
Low-Cut Filter,
6 dB per octave
Corner Frequency:
1. For Other General Specifications, Input Specifications,
and Output Specifications, see back page.
2. See ELX-1A owner’s operating and service instructions.
3. If mixer is powered from an external dc source of less
than 30 volts (24 volts minimum), the phantom power
voltage is reduced to the source value.
100 Hz
Phantom Power (mic inputs only, 3,600ohm equivalent source resistance):
30-V dc3
Power Requirements,
115 or 230 volts, switchable,
50/60 Hz, 12 watts
External dc:2
24-45 volts, 100-mA maximum
Colors, Materials and Finishes,
Dark gray painted metal with
white graphics
Medium gray with light gray inserts
Light gray
4.45 cm (1.75 in.)
48.3 cm (19.0 in.)
21.0 cm (8.25 in.)
Net Weight:
3.36 kg (7.4 lb)
Shipping Weight:
4.1 kg (9.0 lb)
ELX-1A Rack-Mount Mic/Line Mixer
Other General Specifications
Clip LED’s:
Limiter Threshold (re 17-dBm line
–10 dBu
Maximum Level,
+14 dBu, ±0.5 dB
Output Display,
–12 dBu to clipping
2,000 ohms
Nominal Level,
Binding Posts:
–5 dBu
1 kHz at <1.5% distortion
+4 dBu
XLR—Line Level:
+35 dBu
+4 dBu
XLR—Mic Level:
+18 dBu
+18 dBu
–44 dBu
8-Ohm Load:
Rise/Fall Time:
10 msec/3 sec
Shorting Protection:
–11 dBu
Output Specifications
–4 dBu
Any output may be shorted
Output Impedance,
indefinitely without damage
Operating Temperature:
60 ohms
XLR—Line Level:
60 ohms
XLR—Mic Level:
Input Impedance,
30,000 ohms
43 ohms left channel;
43 ohms right channel
2,000 ohms
15,000 ohms
2,000 ohms
Nominal Level,
Nominal Load Impedance,
–10 dBu
Maximum Level:
Binding Posts:
+18 dBu
XLR—Line Level:
+18 dBu
XLR—Mic Level:
–30 dBu
8-Ohm Load:
–1 dBu
600-Ohm Load:
+18 dBu
Binding Posts:
600 ohms
XLR—Line Level:
–50 dBu
10 ohms
3,500 ohms
–10 dBu
Binding Posts:
–20°C to +60°C (–4°F to +140°F)
Input Specifications
600-Ohm Load:
600 ohms
8-600 ohms left channel;
+12 dBu
ELX-1A Rack-Mount Mic/Line Mixer
Light 1 dB below clipping, follow
supply voltage
8-600 ohms right channel
–10 dBu
ELX-1A Rack-Mount Mic/Line Mixer
ELX-1A Rack-Mount Mic/Line Mixer
600 Cecil Street, Buchanan, MI 49107
616/695-6831, 616/695-1304 Fax
©EVI Audio 1999 • Litho in U.S.A.
Part Number ?????? — 9938