Emtech Electronics EJ-10 User Manual

MODEL EJ-10

Multi-Input Adapter Box

Solve Your Sound

Connection Problems The Easy Way…

The EJ-10

Table of Contents

Controls and Functions

Basic Information

Read this section for basic information on what the EJ-10 is: what it includes,
how it works, and what you need to use it.

Using the EJ-10 with Audio Equipment

Read this section for step-by-step instructions for using the EJ-10 in some
common situations.

• Using the EJ-10 with audio devices with AUX-type connections

• Using the EJ-10 with audio devices with loudspeaker connections

• Troubleshooting

Using the EJ-10 with Telephones

Read this section for complete information and instructions for using the EJ-10
with telephones.

• Listen to a telephone conversation over your sound system

• Play an audio device into the telephone line

• Play an audio device into the telephone line to be heard on a sound system in

another location (requires two EJ-10’s)

• Allow the proceedings at one location to be heard at another over telephone
lines (requires two EJ-10’s)

Technical Information

Read this section for details about the Emtech Model EJ-10 Multi-Input Adapter
Box’s technical specifications.

Warranty

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Controls & Functions

1. To (From) Telephone Line – allows any telephone line input.

2. To Telephone Set – allows parallel telephone set connection with EJ-10 – to

establish call.

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3. Telephone Switch ON-OFF – captures and holds telephone line allowing you

to hang up the phone without losing the call – connects EJ-10 to phone line.

4. Audio Input – lowest lever input used to drive phone line (8 Vp-p) minimum

buffered stereo – for weak signal to microphone out – also highest level
output from phone line input.

5. Stereo Input – accepts stereo line level audio signal input – 1 volt RMS to

microphone – or 25 Vp-p signal to phone line.

6. Loudspeaker Level Input – accepts speaker level signals up to 10 volts RMS

and provides a power load 10 ohms – 10 watts for lowest distortion and noise.

7, 8 & 10. Mono RCA, 1/8” Mini & 1/4” Phone Auxiliary Line Level Inputs – accept

line level 1 volt RMS input – buffered inputs allow up to six different inputs
at the same time.

9. Cords Clip – patch cords are clipped to the EJ-10’s box so they won’t get lost.

Clip can be removed to add or subtract patch cords.

11. Hum Switch – connects the shield ground from inputs to output allowing a
selection for lowest hum pick up.

12. Volume Control – controls signal volume in any of 4 signal directions:
a) Inputs to Microphone Out
b) Phone In to Microphone Out
c) Phone Input to “Audio Input (Output) No. 4” connector (used for
recording)
d) Inputs to Phone Out

13. Output Cord to Microphone Input (XLR) – buffered isolated microphone level

signal out to: microphone input jack of the sound system, microphone wall
jack, existing P.A., sound reinforcement system, or house sound system.

14. Basic Use Instructions Operations & Examples – quick reference operations

Examples displayed on front of EJ-10’s.

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The EJ-10

Basic Information

The EJ-10 is a multi-input adapter box that allows you to use one or more pieces
of audio/visual equipment with the speakers and volume of an existing public address
(P.A.) or sound system. Several audio devices can be used simultaneously. The EJ-10
provides everything you need to simply connect tape recorders (of all types), record
players, movie projectors, video cassette recorders, telephones, or electronic instruments
(such as guitars or keyboards) to the microphone connection of an existing sound system.

Even though these audio devices use different plugs and strengths of signal, with
the EJ-10 and its basic set of cables, these usually incompatible audio devices can work
together. The EJ-10 provides the necessary matching and isolation to protect the existing
public address system while providing a high quality audio interface to the system.

The EJ-10 has its own volume control which allows you to balance the signal of
the incoming sound to the needs of your sound system. When more than one audio
device is connected through the EJ-10, the EJ-10 serves as a master volume control. The
EJ-10 uses the power from the signal itself; this means it doesn’t need batteries or a
power cord.

The cords attached to the back of the EJ-10 are some of the most useful kinds of
cables for connecting your equipment to the EJ-10. These cables are clipped to the EJ­10’s box so they won’t get lost. If you find you frequently need another type of cable (as
when using two audio devices which require identical cables), you can easily add it to the
clip. Use a Phillips screwdriver to remove the clip to add more cords.

• Mini (1/8”) to Standard (1/4”) Stereo Phone Plugs

• Standard (1/4”) to Standard (1/4”) Phone Plugs

• Paired RCA to Mini (1/8”) Phone Plugs

• Telephone Modular to Modular Plugs

The EJ-10 is the finest multi-interconnect system available. The EJ-10 does not
compromise the quality of sound of the equipment it is used with; it expands the
capabilities and range or use of whatever equipment you have. The EJ-10’s straight­forward, efficient design ensures that you will enjoy many years of trouble-free use.

Using the EJ-10 with Audio Equipment

Line Level Audio Devices

Audio device Output labeled: LINE OUT, AUXILIARY, AUX OUT, EARPHONES,
EAR, EXT. SP., PHONO, etc.

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This section explains how to use the EJ-10 to properly connect the following
audio devices to a microphone input jack (connector) of a sound system. Use this
procedure with the following:

• Compact Disc Players

• Cassette Players

• AM/FM Stereo Cassette Players

• Tape Decks

• VCR’s

• Radios

• Dictaphones

• Reel-to-Reel Tape Decks

• Stereo Receivers

• Record Players

• Musical Instruments (such as electric guitars and electronic keyboards)*

• Or other equipment with the AUX-type output

NOTE: More than one audio device can be connected to the EJ-10 at the same time. In
this case, the EJ-10’s volume control serves as master volume control for all audio
devices.

* Electronic instruments will only work if they contain a preamplifier (pre-amp). If you
are unsure whether the instrument has a pre-amp or not, you will not harm either the
instrument or the EJ-10 by simply attempting to connect it as described below.

To Get Ready:

1. Take audio device and EJ-10 to the most convenient microphone connector of the

sound system. NOTE: You need not attempt to remove the EJ-10 from its case; it

is permanently attached to prevent loss or damage to the EJ-10 and its cables. If

you cannot place the audio device near a microphone connector you will need a

microphone extension cord long enough to reach from the EJ-10 to microphone

connector. If you need it, plug the extension cord into the microphone connector

and carefully place the cord so that the free end is within easy reach of the audio

device and the EJ-10.

2. Turn the volume control knob of the EJ-10 down to minimum volume (MIN).

3. Plug in the audio device’s power cord (use a properly rated extension cord if

necessary).

4. Turn on the sound system and set its microphone volume control to a moderate or

mid-way position.

To Make Connections:

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5. Locate the output connector (jack) on the audio device. It may be labeled LINE

OUT, AUXILIARY, AUX OUT, EARPHONES, EAR, EXT. SP., PHONO, etc.

If the audio device is stereo, there may be two connectors: one for each channel.

NOTE: The EJ-10 mixes the stereo signals and sends a balanced, mono signal to

the sound system. Some audio devices have AUX or MIC inputs, be sure to use

output connectors.

6. Select the cord from the set on the back of the EJ-10 that mates with the output

connector(s) you just located on the audio device. Plug the patch cord(s) into the

audio device. Chose whichever end of the patch cord matches the audio device’s

output connector; the other end will mate with one of the inputs on the EJ-10. If

need be, you may use only half of the paired cable.

NOTE: If your audio device has a single outlet stereo jack, use either the yellow

Mini (1/8”) to Standard (1/4”) or the black Standard (1/4”) to Standard Stereo

cord. For audio devices with mini (1/8”) jacks, plug the mini end of the yellow

cord into the audio device. For audio devices with standard (1/4”) jacks, plug

either end of the standard cord into the audio device.

7. Check that the volume control on the EJ-10 is turned to MIN, then plug the other

end of the patch cord (the cords are color coded) into the matching jack (or jacks

for paired stereo cords) on the EJ-10. Choose from the seven jacks on the center

top of the EJ-10 labeled AUXILIARY LINE LEVEL INPUTS and STEREO. If

you used half of the paired cable, be sure to use the same color plug at both ends.

NOTE: If you used either the yellow or black single-connection stereo cord, be

sure to use the STEREO jack on the EJ-10. Although standard plugs will fit into

the standard jacks on the right of the EJ-10, use the STEREO jack for making

single connector stereo connections.

8. Plug the XLR microphone connector (the connector on the thick black cord that

comes out of the right side of the EJ-10) into the microphone input jack of the

sound system (or into the microphone extension cord if you are using one).

9. Turn on the power to the audio device and turn its volume up partway (you should

not hear anything yet).

10. Turn the EJ-10’s volume control up to the desired level (with the audio device

operating, you should be able to hear it now). If you have more than one audio

device connected, use the audio devices’ own volume controls to set the balance

among them; the EJ-10 serves as the master volume control.

11. Try switching the EJ-10’s HUM switch (on the upper right corner of the EJ-10)

back and forth. Set it in the position that produces the least amount of hum.

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