LY International Electronics PB4000 User manual

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P.A.SERIES
Very Powerful Public Address Amplifiers
PB3000
PB3500
PB4000
Before operating, please read this manual completely.
FEATURES
 Transformer isolated 100V(200V), 70Vand 4Ω speaker outputs.
 5-element indicator for status display.
 XLR socket and 6.35mm jack for link convenient.
 Output sort-circuit protection & display.
 Various models of very powerful output available.
O W M E R ’ S M A N U A L

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AMPLIFIER FRONT VIEW
1. AC power switch（1 is power on
and the “power LED” is on ) 5. PROT LED indicator (DC or
2. POWER LED indicator output circuit shorted indicator)
3. CLIP LED indicator (Please reduce 6. TEMP LED indicator
the gain to prevent severely clipped (high temperature indicator)
waveforms reaching the loudspeakers) 7. Unit’s fan exhaust window
4. SIGNAL LED indicator (Output level) 8. Volume (input attenuator)
AMPLIFIER REAR VIEW AND CONNECTIONS
1. fan intake window 7. XLR input
2. 100V output(PB4000:200V) 8. 6.35mm socket input
3. 70V output（PB4000:100V） 9. 6.35mm socket link
4. 4-16Ωoutput 10. XLR link
5. COM. output 11. AC power cord
6. 220V AC fuse
1
2 3 4 5 6
7 8
7 8 9 10 11
Pre Amp：
PB9811P
Another Amp：
PM series
or
or
1
2 3 4 5 6

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Note:
Never connect the “hot” terminals together.
When connecting load (speakers), it is better to use one pair of output terminals only.
OPERATING PRECAUTIONS
 Make sure the AC mains voltage is correct and is the same as that printed on the rear of the amplifier.
 Damage caused by connecting the amplifier to improper AC voltage is not covered by the three-year
US warranty. Make sure the power switch is off before making any input or output connections.
 It is always a good idea to have the gain controls turned down during power-up to prevent speaker
damage if there is a high signal level at the inputs.
INPUT CONNECTING
Input connections are made via either the 3-pin XLR-type
connectors (Figure 1) or 6.35mm sockets on the rear side
of the amplifier.
OUTPUT CONNECTING
Load can be connected using banana plugs or spade lugs. A black binding post is considered “COM”, while
the three red binding posts are considered “hot”.
If the PROT Led goes on steadily and the buzzer sounds while power has been turned on and signal has
been fed, there must a trouble of output shorted. please turn it off and correct the trouble then turn it on
again.
ground signal
1
2
3
Figure 1 3-pin XLR-type connectors

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Specifications
Model PB3000 PB3500 PB4000
Rated power 1000W 1500W 2000W
Input sensitivity 70V，100V(PB4000: 200V)
Ratio of signal to noise (A weighted) 90dB
Frequency response 80Hz-15kHz (±3dB)
distortion <0.5%(1kHz，1/3rated power)
indicators “POWER”，“CLIP”，“SIGNAL”，
“PORT” “TEMP”
protection Power turn on-turn off，High temperature，
DC voltage，short circuit limiting
Power requirement AC 220-240V/50-60Hz
Dimensions 482×480×132mm
Gross weight 33.5kg 38.5kg 42.5kg
Net weight 30kg 35kg 39kg
Specifications are subject to be changed without notice.
LY International Electronics Co., Ltd.
CAUTION
● When the “Power switcher”
is off, please pull out the power cord from the socket. Please keep the
equipment out of water.
● To reduce the risk of electric shock, do not remove the cover.
● No user parts inside. Refer servicing to qualified service personnel.