LY International Electronics EF-804 User manual

Table of Contents
Introductions ----------------------------------------- 2
Features -----------------------------------------------3
Front panel controls ------------------------------- 4
Rear panel controls ---------------------------------6
Block diagram ----------------------------------------8
Specifications ----------------------------------------9
Table of Contents
1

Welcome
Congratulation and thank you for the purchasing EF-801 EF-802 or EF-804 pre amplier.
Unpacking and Installation
Introductions
2
Introductions
Although it is neither complicated to install nor difcult to operate unit, a few minutes of your
time is required to read this manual for a properly wired installation and becoming familiar
with its many features and how to use them. Please take a great care in unpacking your set
and do not discard the carton and other packing materials. They may be needed when moving
your set and are required if it ever becomes necessary to return your set for service. Never
place the unit near radiators, in front of heating vents, excessive humid or dusty location to
avoid early damage and for your years of quality use.
Connect your unit with the system components according to the description on the following
pages.

- Front : 4 Mic/Line Input Level(CH1-4) with 3-band EQ and output zone selector switches.
Features
4 Line Input Level (CH5-8) with output zone selector switches.
3
Features
•Controls
Output Level control with 2 Tone control and Mute switch.
Monitor Level control with output zone selector switches.
- Rear : 8 Gain control for each input.
Talkover switch for Ch1.
Phantom Power switches for CH1 and CH2-4.
•Connectors
- 4 XLR Electronically Balanced jack and 1/4” phone jack for CH1-4 input.
- 4 1/4” phone jack and RCA jack for CH5-8 input.
- RJ45 jack for Remote music source input and remote mic input.
- Euro Block for output.
- Power,SIG, CLIP for each input channel and SIG,-20dB,-10dB,0dB, CLIP, for each output channel.
•Indicators:
- Four individual external mute and all mute interface.

FRONT PANEL
Front Panel Controls
1.INPUT CHANNEL EQ CONTROLS
2.SIGNAL INDICATORS
3.PEAK INDICATORS
4.INPUT CHANNEL VOLUME
5.OUTPUT CHANNEL SELECTORS
6.OUTPUT CHANNEL EQ CONTROLS
7.OUTPUT LEVEL METER
8.CLIP INDICATORS
Front Panel Controls
4
These controls allow to equaliza the input signal from -12dB to +12dB at 80Hz(LOW),2.5kHz(MID)
and 12.5kHz(HIGH) for CH1~CH4.
These indicators show current input signal on the each input channels.
These indicators warn against overload shortly on the each input channels. We would like to
recommend for users to adjust TRIM control on the rear panel when PEAK indicators are ickering
to make best performance.
These allow to adjust for each input level.
These selectors allow to route each input signal through out to selected output channels.
Output channels have two band equalizer which is adjustable over a wide range as follow.
HIGH : ±15dB at 12KHz / LOW : ±15dB at 80Hz
These indicators show current output level.
These indicators warn against overload shortly on the each output chan-nels. We would like to
recommend for users to adjust VOLUME control when CLIP indicators are ickering to make best
performance.
10
11
12
13
14
1516
1

5
Front Panel Controls
9.MUTE SWITCH
10.OUTPUT VOLUME
11.POWER INDICATOR
These buttons allow to mute for each output channels.
These faders allow to adjust the level for each output channels.
This indicator lights when power switch is turned on.
12.POWER SWITCH
This button is power on/off switch.
13.MONITOR SWITCH
These switches allow you to monitor each output channel through monitor speaker.
14.MONITOR OUTPUT CONTROL
This control allow to adjust the monitor level of monitor speaker.
15.MONITOR SPEAKER
16.PFC/ATL SELECTOR
This control allow you to select monitor before or after master volume.

Rear Panel Controls
6
Rear Panel Controls
1.AC POWER INPUT CONNECTOR
2.REMOTE INPUT
Acorrect capacity of fuse and power cable should be applied. Please make sure the value of fuse
before replacing.
These RJ45 jacks allow to connect with VP-1(wall control panel) for ad-justing volume and inserting
music source of remote area.
1
10

7
Rear Panel Controls
3.LINE OUTPUTS
4.TRIM CONTROLS
5.SIGNAL INPUTS
6.TALKOVER SWITCH
7.PHANTOM POWER SWITCH
These LINE output blocks can be connected to the input of a power am-plier.
These controls allow to accept variable input level. They have 44dB adjustable range as -50dB to -6dB
for microphone input channels and -30dB to +14dB for line input channels.
This amplier provide several connectors for signal input and these con-nectors allow easy connection.
The channel 1~4 are balanced line and microphone input and channel 5~8 are mono line input.
All other input signals are muted by the input signal of channel 1 auto-matically when this switch
pressed on.
The phantom power can be provided to each microphone input for using condenser microphone.
8.EXT.MUTE
Mutes input signals fed to CH1~CH4 employing muting function by short-circuiting at these terminals.
9.DC 24V INPUT & LINK TERMINAL
If connected to DC 24V.These terminals are provided for the connection of 24V DC power source.24V
DC battery source can be connected to these terminal.The device will supply power to other device by
the link output terminal.
10.REMOTE MIC INPUT
This RJ 45 Jack allow to connect EM-4(desktop remote microphone) for individual zone annauncement.

8
Block Diagram
Block Diagram

Specifications
9
Specifications
*Specications and design subject to change without notice for improvements.
Model Name
Rated Output Level / Impedance
Frequency Response (-1dB)
T.H.D
Closstalk
EF-801
Dimensions (W x H x D)
Weight (Net)
Power Source
Output
Input
Equalization
Hum & Noise
Input sensitivity
/Impedance
Remote Input
Line Input
-50dB~ - 6dB / 20KΩ Balanced
-30dB~ +14dB / 20KΩ Balanced
20Hz - 20kHz
< 0.1%
>70 dB
>90 dB
AC 100-240 V, 50/60Hz
9 kg
420 x 88 x 320mm
High : 10 kHz ± 15 dB / Low : 100 Hz ± 15 dB
High : 12 kHz ± 15 dB / Mid : 2.5 kHz ± 15 dB /
0dB / 600 Ω Balanced
Low : 80 Hz ± 15 dB
0dB / 600Ω balanced
Mic Input
Output level / Impedance
0dB / 600Ω balanced
EF-802 EF-804
8.5 kg
8 kg
Channel 1 CH 2 CH 4 CH