Professional Public Address System
EMMA-912A
EMMA-925A
MP3/Tuner/Integrated PA Power Amplifier
Operation Instructions
Please read this manual carefully before use.
Performance features
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5-channel microphone input ports, 2-channel auxiliary line input ports, 1-channel EMC input port,
1-channel line output port.
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Convenient MP3 and tuner functions, with station tuning and power failure saving function.
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Chime output function.
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Two stages priority mute function.
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Tuner/MP3 status liquid crystal display (LCD), Chinese subtitle, 5 segment LED level meters.
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Each channel with independent volume control, treble and bass adjustments.
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100V, 70V constant voltage output and 4Ω fixed resistance (balanced, non-grounding) output.
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AC 220V working voltage.
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Output short-circuit protection and with warning alarm.
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Single board complete PA system.
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Front panel
Auxiliary input (AUX) 2 jack
12
13 14
15 16
17
18
1. Power indicator 7. Treble adjust 13. Tuner status operation button
2. Mains switch 8. Microphone volume adjust 14. MP3 play status operation button
3. LED level meter 9. Line 1/Microphone 4 volume adjust 15. Tuner/MP3 volume increase button
4. Chime 1 button 10. Line 2/Microphone 5 volume adjust 16. Tuner/MP3 volume decrease button
5. Chime 2 button 11. No. 1 (priority) microphone jack 17. Tuner/MP3 status stop button
6. Bass adjust 12. Tuner/MP3 play status display screen 18. USB port
Remarks: Overload distortion occurs when 5 LEDs are light up, and it is necessary to adjust the related
volume control knob to make the 4-5th indicators flash.
Back panel
2 3 4 5 1
6
7
8
9
10
11
1
2
3
4
5
6
7
8
10
9
11 12
13
1. FM antenna jack 7. AC 220V fuse 13.
2. AM antenna jack 8. Heat radiation blower window 14. Auxiliary line 2/ Microphone
3. No. 2 microphone jack 9. Chime volume adjust knob 15. Microphone 5 jack
4. No. 3 microphone jack 10. Auxiliary line 1/Microphone 4
5. Phantom power switch 11. Microphone 4 jack 17. EMC signal input jack
6. 4 output terminals 12. Auxiliary input (AUX) 1 jack 18. AC220V power cord
Remarks: Among the four output terminals, you can only use 1 pair at a time.
2
14
15 16
17
convert switch
18
5 convert switch
16. Line output port
System connection
AMP
MIC1
FM INT
AM INT
MIC2
MIC3
LOW
IMPEDANCE SPEAKER
4 ohm, 8 ohm, 16 ohm
100V,70V,LINE SPEAKER
OTHER
AUDIO
DEVICE
MIC4
3
MIC5
ALARM GENERATOR
Operation instructions
I Operating instructions of equipment function
1. Volume adjusting: To meet customer's different demands on the music tone, this equipment is
provided with 7 adjusting knobs relative to sound in total. Among them, “BASS” is the bass tone
adjusting knob, “TREBLE” is the treble tone adjusting knob, “MIC1, MIC2, MIC3” knobs are
used to adjust the volume of Microphone 1, Microphone 2, and Microphone 3. The adjustment of
the corresponding volume for “MIC4/AUX1 VOL” and “MIC5/AUX2 VOL” is controlled
through the “AUX1/MIC4” and “AUX2/MIC5” selecting switches at the back panel. When
“AUX/MIC” selection switch selects line (AUX), “MIC4/AUX1 VOL” and “MIC5/AUX2 VOL”
knobs adjust the volume of the line (AUX); When “AUX/MIC” selection switch selects MIC,
“MIC4/AUX1 VOL” and “MIC5/AUX2 VOL” knobs adjust the volume of MIC.
2. Microphone application: The microphone inputs are provided with the phantom power supply,
when the condenser microphone is used, please turn on the phantom mains switch on the back
panel, and when the dynamic microphone is used, please turn off the phantom mains switch. This
machine is provided with 5-channel microphone inputs and 2-channel auxiliary line inputs. Among
them, the microphone input jacks for MIC1, MIC4 and MIC5 are 6.3mm; The MIC2, MIC3 are
XLR type socket jacks.
The volumes for Microphone 1, Microphone 2 and Microphone 3 are adjusted through “MIC1
VOL”, “MIC2 VOL” and “MIC3 VOL” on the front panel. Microphone 4 and Microphone 5 jacks
are compatible with the Auxiliary line 1 and the Auxiliary line 2 jacks, and “AUX1/MIC4” and
“AUX2/MIC5” converting switches at the back panel are used to change over freely the input
method. AUX switch selects the line signal; MIC switch selects the signal from microphone.
4. Priority function: Microphone 1 has the highest priority, and its signal overlays all the input signals
from other ports. The chime and the EMC port has the second highest priority, and its signal
overlays all the other signals except Microphone 1.
5. Chime: This equipment is provided with Chime 1 and Chime 2 signals, and the chime volume can
be adjusted by the chime adjusting knob on the back panel. Pressing Chime 1 button is to start the
chime signal, and the output terminal will send out ‘1-3-5-i’ chime note, in the meantime, the
signal indicator of Chime 1 button is light up; Similarly, pressing Chime 2 button also starts the
chime signal, and the output terminal will send out ‘i-5-3-1’ chime note, and in the meantime, the
signal indicator of Chime 2 button is light up, until pressing this button again to cancel the chime
signal, and the indicator will be turned off automatically.
II Setup operation of the play status
The set is equipped with two source players, the tuner and the MP3 player. It is easy to interchange
between these two kind of players conveniently: When the equipment on tuner mode, and when
pressing any button under MP3 operation mode, the equipment will be changed to MP3 playing
status automatically, and the screen will display “CONVERT TO MP3”. In this case, the MP3 will
enter play mode if USB port is connected with UBS memory; When the equipment is placed under
MP3 play mode, the equipment will changed to the tuner play mode automatically when any
button for the tuner is pressed and the screen will display "CONVERT TO RADIO".
After converting to a certain play mode, the setup operation is as follows:
1. The setup operation of tuner at play mode:
1) Press BAND button to change between ‘AM’ and ‘FM’ bands.
2) Press (lightly) the UP/DOWN button each time to raise the station frequency one step (one
step for FM being 50 kHz, one step for AM being 9 kHz). If you press the UP/DOWN
button over 3 seconds, it will enter the auto search mode, and it will search the station
frequency continuously until it stop automatically. The station searched will be saved
automatically one by one in the sequence of (1-20). During searching if the UP/DOWN
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button is pressed the equipment will stop searching.
3) MEMO button is to store the station frequency received. FM band contains 1-20 memory
location, and AM band also has 1-20 memory location. Press MEMO button, the digit
displayed on the screen is the last operation number, namely the last saving sequence number
and tuner frequency number.
4) M-DOWN and M-UP buttons are used to save the station saving number upward or
downward. M-DOWN button is for downward adjusting, and M-UP button is for upward
adjusting. For example, if you want to save frequency 107.65 to the 18th memory location,
but when you press the MEMO button, the screen displayed is the 19th saving number, then,
you press M-DOWN button and press again MEMO button at this time to save the band of
frequency 107.65 to the 18th saving number.
2. The setup operation of MP3 play mode:
The USB port of the machine can accept a memory such as common disc, MP3 player and
movable hard disc and card reader machine, etc. When these equipment are inserted to the USB
port of the machine, it can search automatically and play the MP3 music file from them. Firstly,
the display screen will display ‘***WELCOME***’in the first line and ‘ EMIX’ in the second
line, then the equipment will play automatically according to the file saving sequence, and the
display screen will display the corresponding play information; If there is no suitable file in the
memory, the display screen will display ‘No Disk’
If the MP3 tracks played are over 99, A blue dot ‘●’will be lit on the display screen.
● Play/pause: Plug into the USB memory, the equipment under the default status will play the MP3
files in the memory automatically. Press button during play will pause the play, and press that
button once more, it will continue playing the track from where it paused.
● Selective play: Press
Press
or
Press
button to fast rewind to 00:00 time section and it will return to the last track; Press
button to fast forward to the end time of the track and it will enter the next track.
● Repeat play: The default play sequence of equipment is to play the whole disc in repeat play.
When you press the button for the first time, it will start the repeat function of the single
track and current track play; Press button again, it will start repeatedly playing the current
track; Press the button for the third time, it will start the repeat function of the current folder
play; Press
button for the fourth time, it will repeatedly play the current folder; Press button for the fifth
time, it will repeatedly play the whole disc.
● Stop play: Press STOP button to stop the play in any playing process.
or
button to select any time section of any track forward or backward.
button to select any track for play forward or backward;
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Installation Precautions
1 Never block the ventilation vent.
2 It is required to stop using immediately if the power cord is worn out.
3 The power amplifier should not be put in the following places:
1) Poor Ventilation;
2) Dusty and damp location;
3) Under direct sunlight;
4) High environmental temperature or near heat source;
5) Subjected to vibration.
4 The housing should be safely grounded.
5 The power supply plug and socket should be compatible.
6 After connecting the power supply and input signal, if you hear a short alarm tone, it means that a
short-circuit exists in the output line. It is required to cut off the power supply immediately, and
the power can only be applied after eliminating the failure.
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Performance specifications
Model No. EMMA-912A EMMA-925A
Rated output 120W 250W
Output adjust rate From full load to no load, less than 3 dB.
Output mode 4Ω fixed resistance output, 70V, 100V constant voltage output
AUX output 600Ω 0. 8V
Input
Frequency response
Harmonic distortion Less than 0.5% at 1kHz, 1/3 rated power
Signal/noise ratio
Tone adjust
Protection AC fuse × 1, overload, short-circuit
Mute function
Built-in music source Tuner, MP3
Mains source AC 220~240V / 50 ~ 60Hz
Power consumed 200W 350W
Dimensions 430×368×88 mm
Gross weight 23.5kg 25.5kg
Net weight 22kg 24kg
Mic 1, 2, 3, 4, 5 with phantom power supply (optional): 600Ω, 2.5 mV
AUX 1, 2: 10 kΩ , 250 mV unbalance; EMC IN: The 10kΩ, 250 mV
Line: 80Hz~16kHz (± 3dB); MIC: 100Hz~10kHz (± 3dB)
Mic 1, Mic2, Mic3 and Mic4, Mic5: 70dB
AUX 1 and AUX2: 75dB
Bass: ± 12dB at 100Hz
Treble: ± 12dB at 10kHz
Mic 1 input overlays other inputs (attenuation 0~-30dB)
CHIME, EMC cover others (except Mic1) inputs (attenuation 0~-30dB)
No prior notice will be given if there is any alteration in the specifications.
Remarks
● The machine is not disconnected completely with the mains power in power net when the
power switch of the machine is at “off” status, for safety, please pull out the power plug
from the socket.
● The equipment should not suffer from the drop of water or water splash and it is not allowed
to place object such as vase filled with water on the equipment.
● Please do not open at will the machine cover plate to prevent electric shock. Certified
professional personnel are required to undertake the repair when it is needed.
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