Electro-Voice ELX-1A Manual de usuario

ELX-1AELX-1A

ELX-1A

Rack-Mount Mic/Line MixerRack-Mount Mic/Line Mixer

Rack-Mount Mic/Line Mixer

••

•Four inputs, one output in a singleFour inputs, one output in a single

Four inputs, one output in a singleFour inputs, one output in a single

Four inputs, one output in a single

rack spacerack space

rack space

••

•VV

Very-high-ery-high-

ery-high-ery-high-

ery-high-quality audio performancequality audio performance

quality audio performancequality audio performance

quality audio performance

••

•High reliabilityHigh reliability

High reliabilityHigh reliability

High reliability

••

•Extensive filtering circuitry andExtensive filtering circuitry and

Extensive filtering circuitry andExtensive filtering circuitry and

Extensive filtering circuitry and

shielding protect against rfshielding protect against rf

shielding protect against rf

interferenceinterference

interference

••

•PP

Power from 115/230-ower from 115/230-

ower from 115/230-ower from 115/230-

ower from 115/230-V ac or externalV ac or external

V ac or externalV ac or external

V ac or external

dcdc

••

•TT

Transformerransformer

ransformerransformer

ransformer-isolated output-isolated output

-isolated output-isolated output

-isolated output

••

•Headphone output with separateHeadphone output with separate

Headphone output with separateHeadphone output with separate

Headphone output with separate

power amp and level controlpower amp and level control

power amp and level control

••

•Switchable 1-kHz oscillatorSwitchable 1-kHz oscillator

Switchable 1-kHz oscillatorSwitchable 1-kHz oscillator

Switchable 1-kHz oscillator

••

•Switchable output limiter preventsSwitchable output limiter prevents

Switchable output limiter preventsSwitchable output limiter prevents

Switchable output limiter prevents

clippingclipping

clipping

••

•30-30-

30-30-

30-V phantom powerV phantom power

V phantom powerV phantom power

V phantom power

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-PulseTM indicator shows power

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.

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 1/4-inch phone jack.

• All other connections on the mixer are

ELX-1A Rack-Mount Mic/Line Mixer

two-conductor 1/4-inch phone jacks.

• 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-oc-

tave 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 phan-

tom power switch.

There shall be a 1/4-inch phone jack auxil-

iary input with the signal from this jack pro-

vided 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 pro-

gram meter. Output shall be transformer iso-

lated 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 line-

level transformer-isolated output.

A chassis-ground connection shall be pro-

vided on a rear-mounted binding post.

A headphone level control and a three-con-

ductor 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 sig-

nal 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 thresh-

old shall be +14 dBu. Front-panel LED in-

dicator shall light whenever limiting occurs.

A main power switch shall be located on the

front panel. The mixer shall operate on 115-

or 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 rear-

mounted 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 front-

panel 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 follow-

ing performance specifications: frequency

response from any input to any output, 30

Hz to 20 kHz, +0/–1 dB; total harmonic dis-

tortion 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 out-

put); 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 cabi-

net 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 mate-

rials or workmanship for a specified period,

as noted in the individual product-line

statement(s) below, or in the individual prod-

uct data sheet or owner’s manual, beginning

with the date of original purchase. If such

malfunction occurs during the specified pe-

riod, 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

Warranty does not apply to: (a) exterior fin-

ish or appearance; (b) certain specific items

described in the individual product-line

statement(s) below, or in the individual prod-

uct data sheet or owner’s manual; (c) mal-

function 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 Electro-

Voice Service or any of its authorized ser-

vice representatives. Obtaining Warranty

Service: To obtain warranty service, a cus-

tomer must deliver the product, prepaid, to

Electro-Voice Service or any of its autho-

rized 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 avail-

able from Electro-Voice Service at 600 Cecil

Street, Buchanan, MI 49107 (800/234-6831

or FAX 616/695-4743). Incidental and

Consequential Damages Excluded: Prod-

uct repair or replacement and return to the

customer are the only remedies provided to

the customer. Electro-Voice shall not be li-

able for any incidental or consequential dam-

ages including, without limitation, injury to

persons or property or loss of use. Some

states do not allow the exclusion or limita-

tion 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 guar-

anteed against malfunction due to defects in

materials or workmanship for a period of

three (3) years from the date of original pur-

chase. Additional details are included in the

Uniform Limited Warranty statement.

For warranty repair or service informa-

tion, 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 Stan-

dard Time.

ELX-1A Rack-Mount Mic/Line Mixer

Figure 1—Block Diagram

ELX-1A Rack-Mount Mic/Line Mixer

Figure2—Front and Rear Views

KeyGeneralSpecifications1

Conditions:

1. 0 dBu = 0.775 V rms.

2. 0 dBm = 1 mW into 600 ohms (0.775 V

across 600 ohms).

3. Measurements are referred to a 1-kHz,

0-dBu sine-wave input unless noted.

4. Measurement bandwidth is restricted to

30 kHz unless noted.

5. Load impedance is 600 ohms unless

noted.

Frequency Response, Any Input to Any

Output (0-dBm output, 500-kHz measure-

ment bandwidth):

30-20,000 Hz, +0/–1 dB

Total Harmonic Distortion Plus Noise,

Mic/Line Output,

+4 dBm, 20-20,000 Hz:

<0.15%

+18 dBm, 50-20,000 Hz:

<0.15%

Stacking or Headphone Output,

+18 dBm, 20-20,000 Hz:

<0.10%

Equivalent Input Noise (mic input, maxi-

mum gain, 150-ohm source, “A”

weighted):

–130 dBm, typical

Output Noise, Inputs Down, “A”

Weighted, Master Down:

£ –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:

82 dB

Mic Input to Stacking Output (modified

for insert patching):2

63 dB

Common-Mode Rejection, 20-20,000 Hz:

60 dB, typical

Low-Cut Filter,

Slope:

6 dB per octave

Corner Frequency:

100 Hz

Phantom Power (mic inputs only, 3,600-

ohm equivalent source resistance):

30-V dc3

Power Requirements,

ac:

115 or 230 volts, switchable,

50/60 Hz, 12 watts

External dc:2

24-45 volts, 100-mA maximum

Colors, Materials and Finishes,

Chassis:

Dark gray painted metal with

white graphics

Knobs:

Medium gray with light gray inserts

Switches:

Light gray

Dimensions,

Height:

4.45 cm (1.75 in.)

Width:

48.3 cm (19.0 in.)

Depth:

21.0 cm (8.25 in.)

Net Weight:

3.36 kg (7.4 lb)

Shipping Weight:

4.1 kg (9.0 lb)

___________________

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.

ELX-1A Rack-Mount Mic/Line Mixer

Other General Specifications

Clip LED’s:

Light 1 dB below clipping, follow

supply voltage

Limiter Threshold (re 17-dBm line

output):

+14 dBu, ±0.5 dB

Oscillator:

1 kHz at <1.5% distortion

Output Display,

Range:

–12 dBu to clipping

Rise/Fall Time:

10 msec/3 sec

Shorting Protection:

Any output may be shorted

indefinitely without damage

Operating Temperature:

–20°C to +60°C (–4°F to +140°F)

Input Specifications

Input Impedance,

Mic:

3,500 ohms

Line:

30,000 ohms

Aux:

15,000 ohms

Stacking:

2,000 ohms

Nominal Level,

Mic:

–50 dBu

Line:

–10 dBu

Aux:

–10 dBu

Stacking:

–10 dBu

Maximum Level,

Mic:

–5 dBu

Line:

+35 dBu

Aux:

+18 dBu

Stacking:

+18 dBu

Output Specifications

Output Impedance,

Main,

Binding Posts:

60 ohms

XLR—Line Level:

60 ohms

XLR—Mic Level:

10 ohms

Headphone:

43 ohms left channel;

43 ohms right channel

Stacking:

2,000 ohms

Nominal Load Impedance,

Main,

Binding Posts:

600 ohms

XLR—Line Level:

600 ohms

Headphone:

8-600 ohms left channel;

8-600 ohms right channel

Stacking:

2,000 ohms

Nominal Level,

Main,

Binding Posts:

+4 dBu

XLR—Line Level:

+4 dBu

XLR—Mic Level:

–44 dBu

Headphone,

8-Ohm Load:

–11 dBu

600-Ohm Load:

–4 dBu

Stacking:

–10 dBu

Maximum Level:

Main,

Binding Posts:

+18 dBu

XLR—Line Level:

+18 dBu

XLR—Mic Level:

–30 dBu

Headphone,

8-Ohm Load:

–1 dBu

600-Ohm Load:

+18 dBu

Stacking:

+12 dBu

ELX-1A Rack-Mount Mic/Line Mixer

ELECTRONICS–Mixer Part Number ?????? — 9938

600 Cecil Street, Buchanan, MI 49107

616/695-6831, 616/695-1304 Fax

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