Ahuja SSA-160 EM Operation Manual

 AHUJEA PA AMPLIFIERS
160W RMS / 220W Max.
doM-IGU EM
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¢ Thankyou for purchasing the AHUJA PA Amplifier.
€ Please read this manual thoroughly before making connections
and turning on the power. Following the instructions in this manual
will enable you to obtain optimum performance from your new
AHUJA PA Amplifier.
$ Please retain this manual for future reference.
* Safety Instructions
Read the Instructions: Please read all the instructions in this section carefully before installation or use of the
product. All the safety instructions must be followed.
Retain the Instructions: Please retain this Instruction Manual for future reference.
may be sufficient to constitute a risk of electric shock. External wiring to any terminal marked with this
1 This symbol, wherever it appears, alerts you to the presence of uninsulated hazardous voltage that
symbol must be done by a trained and instructed person only.
This symbol, wherever it appears adjacent to a component, alerts you that the concerned componen
can only be replaced by another of the exact same specifications.
WARNING
e To reduce the risk of electric shock, do not remove the top cover. No user serviceable parts inside. Refer all
servicing to qualified personnel only.
e Before replacing any fuse, make sure the set is switched off and disconnected from the AC mains or any other
power source. Replace a fuse only with another of exactly same specification.
CAUTIONS
Water & Moisture: To reduce the risk of fire or electrical shock, do not expose this set to rain or moisture. Do not
use this set near water or in a wet location. Do not keep any object filled with liquid, such as a vase, on top of this set.
Do notinsert or remove the AC mains plug with wet hands.
Power Source: The voltage & frequency of the AC mains supply, and the voltage of the external battery, (if
applicable) to which this set can be connected, is marked on the rear panel of the set. Do not connect this set to any
power source other than those specified on the rear panel.
Power Cord Protection: Do not cut, kink, damage or modify the AC power cord supplied with this set. Keep the
AC power cord away from heaters and harmful chemicals. Do not keep any heavy object on the power cord.
Operation on Generator: When operating this set on a generator, make sure the set is switched off till the
generator voltage has stabilized.
Ventilation: This set should be situated so that its location or position does not interfere with its proper ventilation.
Do not cover the ventilation holes / slots. Do notinsert or drop anything into the ventilation holes / slots.
Stability: This set must be kept in a stable and flat horizontal position, and never in a tilted position. Do not place this
set on an unstable stand, tripod, bracket or mount. Do not use attachments which are not supplied or explicitly
recommended by the manufacturer.
Cover Strip: The cover strip of the 100V / 70V audio output terminal strip, and of any other high voltage output
terminal strip, must be replaced after making connections. Failure to do so may result in exposure to hazardous
voltages.
Earthing: This set must be earthed properly before use. A wire from the Earth terminal on the rear panel must be
connected to electrical earth.
Cleaning: Disconnect this equipment from the AC mains and external battery before cleaning. Clean with a damp
cloth, but do not allow any liquid to enter the set. Do not clean with liquids or aerosols.
Exposure to Heat: Do not touch the heatsinks while the set is working.
SSA-160°EM
Contents Page No.
o Features/ General Description of Product. ...................€6—x22Ñ€6es0s.e merecer 4
© _ Front Panel Controls & Features ..ı. iii, 5
® _ Rear Panel Controls & Features . aa a ea a a aan ee 6
© InterconnectionS .. 0.0.0. .0recacecocarcerearecearecoenen 7
o Speaker Connection Guidelines . ii aa a aa a ae ana 9
© Typical Applications . ........... eeridaaCeaennenceaeroa o. 12
9 Specifications.............. ee 16
3
SSA-160°EM
Designed for use in a wide variety of PA applications.
SSA-160°EM is a 160 Watts Mixer Amplifier with Three Unbalanced
Independent Mic inputs and Two Unbalanced Mic Inputs alternate to two
Auxiliary inputs.
SSA-160°EM has a Preamp output for recording the program, a Line
output for connecting to a Booster Amplifier and a Line input for
connecting to an external PA Audio Mixer.
Box Speaker/ Driver Unit selector switch has been provided for protecting
the Driver Unit's diaphragm from unwanted low frequencies. Since Box
speakers can reproduce the full spectrum of audio frequencies but Driver
Units cannot reproduce very low frequencies, the switch should be
positioned to the Driver Unit side when Driver Units, Horns and Column
speakers are connected.
Circuit Protector Device has been provided which safeguards the
amplifier against overload and short circuit.
Provision for automatic changeover from AC to Battery Operation
ensuring continuity of program has been provided.
® Protection provided against the reverse polarity of Battery connections.
® Ease of operation, combined with service accessibility has been
optimized inthe design.
SSA-160°EM
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(—Mic- 1—
4 6
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MIC-1
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4 6
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2 8
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MIC-2
MIE 3—
4 6
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2 8
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MIC-3
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MIC-4/AUX- 1
4 6
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2 8
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~MIC- SIAUX- "a
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08050
| OUTPUT LEVEL
SSA-160EM
TREBLE
FLAT
2 92
4 4
6 6
8 8
40 +0
cut | BOOST
BASS
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BASS Control
For attenuating or boosting the signal level of low
frequencies.
TREBLE Control
For attenuating or boosting the signal level of
high frequencies.
POWER Switch
Push the top part of the knob to switch the
amplifier ON. Push the bottom part of the knob to
switch the amplifier OFF.
POWER LED
This LED glows when the amplifier is switched
(2)
MIC-1 Input Jack Socket
For accepting unbalanced signal from a low
impedance microphone.
MIC-2 Input Jack Socket
MIC-3 Input Jack Socket
MIC-4 Input Jack Socket
MIC-5 Input Jack Socket
BOX SPEAKER / DRIVER UNIT Selector
©
©
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
OVERLOAD LED
This LED glows when the circuit protector trips.
RESET button
This button pops out when the circuit protector
trips. Rectify the cause and press the RESET
button for resetting normal operation of the
amplifier.
LED Array
This indicates the output level of the amplifier.
MASTER Volume Control
For adjustment of the overall volume level from
the amplifier.
MIC-5/AUX-2 Volume Control
MIC-5/AUX-2 Selector Switch
MIC-4/AUX-1 Volume Control
MIC-4/AUX-1 Selector Switch
MIC-3 Volume Control
MIC-2 Volume Control
MIC-1 Volume Control
SSA-160°EM
22.
23.
24.
25.
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3 Core AC Mains Cable With Plug 28. AUX-2 Input Jack Socket
. For accepting an unbalanced signal from an
SPEAKER Terminal Block (70V, 100V) и,
For connecting speakers with 100V line matching ray eee Tuner, Cassette Player,
transformers.
SPEAKER Terminal Block (4 ohm and 8 ohm) — 29: AUX-1 Input Jack Socket
For connecting low impedance speakers. 30. BATTERY Terminal Block
For connecting two 12V Car Batteries in series
PREAMPLIFIER Output Jack Socket .
For connecting to the AUX input of another (which becomes 24V) as standby power source.
amplifier or a cassette recorder for recording 31. EARTH Terminal
purpose. 32. AC MAINS FUSE Rating 3 AMP 250V (T 3A L)
26.
27.
LINE Output Jack Socket
For connecting to a booster amplifier to obtain
combined higher power output.
LINE Input Jack Socket
For connecting inputs such as a CD Player. Also
for connecting an external Mixer to enhance the
number of inputs.
This protects the amplifier from any excessive
current flow.
CAUTION
e The equipment must be earthed properly before operating it to avoid electric shock. À wire from the Earth
Terminal must be connected to electrical earth for safe operation.
SSA-160°EM
e The amplifier can be placed as a tabletop unit. The amplifier should be
situated so that its location or position does not interfere with its proper
ventilation.
e The amplifier must be powered through an AC earthed mains outlet.
e All connections must only be carried out or changed with the amplifier
switched OFF.
® The amplifier may be operated from a DC supply of 24 Volts (two car
batteries connected in series).
® To avoid loud switching noise, always switch ON the Power amplifier after
all other units of the audio system have been switched ON. After operation
switch it OFF first, then the other units.
® The connection diagrams that follow display the typical types of input
sources (Mics, Keyboard, Cassette Player, Mixer, CD Players etc.) and
speakers (Wall, Ceiling, Box, Horn, Column) which can be connected to
the amplifier. For correct connections and operation check the
specifications of the connected equipment.
FRONT PANEL - SSA-160°EM
7 —MIC-1—x 7 —MIC2—x 7 — MIC-3—x MIC-4/AUX-1~
4 6 4 6 4 6
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2 8 2 8 2 8
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rMIC-5/AUX-2,
. ° OUTPUT LEVEL
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SSA-160EM
BASS TREBLE POWER
FLAT FLAT
MIC-1 MIC-2 MIC-3
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SSA-160°EM
Interconnections....
REAR PANEL - SSA-160°EM
МАМАМ МАМ
KEYBOARD
CASSETTE PLAYER
||
ИМИ
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24V DC — NO USER SERVICEABLE PARTS IN A O © AUX-1
REFER SERVICING TO QUALIFIED PERSONNEL ONLY 7 \
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MICROPHONES
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PA MIXER
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SPEAKERS COLUMN
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LMT WITH 100V
LMT
CASSETTE RECORDER
WALL ZA CEILING
SPEAKERS AN SPEAKERS
WITH 100V US) witH 100v
LMT = LMT
8
SSA-160°EM
SSA-160°EM is a medium power PAamplifier. Therefore itis very important that correct loudspeaker connections are
made to avoid damage to the amplifiers or speakers.
De
SAX-300DX
СОМ 40 80
СОМ 40 80
O SRX-120DX SRX-120DX
Resultant Impedance = (8 Ohm/2 ) = 4 ohm
80 80
СОМ 40 80
O SAX-150DX SAX-150DX
Resultant Impedance = (8 ohm/2) = 4 ohm
Low Impedance Speaker Connections
e Box type Speakers can be directly connected to COM-4Q
/ 8Q Terminal Strip.
e The Box Speaker / Driver Unit switch must be kept at Box
Speaker position. If by mistake the switch remains in
Driver Unit position the quality of sound will not be rich
and natural.
e No Driver Units / Horn Speakers / Column Speakers (with
100V LMT) should be connected to COM-40/ 802.
Connecting SAX-300DX Speaker
SAX-300DX speaker (300W) should be connected to
COM & 8 ohm as shown in figure.
Connecting Two SRX-120DX Speakers
The Two SRX-120DX Speakers (each speaker can
handle 100W of power) should be wired in a parallel as
shown in figure. The resulting impedance will be 4 ohm.
The speaker system should be connected to the 4 ohm
tap of the amplifier.
Connecting Two SAX-150DX Speakers
The Two SAX-150DX Speakers (each speaker can
handle 150W of power) should be wired in a parallel as
shown in figure. The resulting impedance will be 4 ohm.
The speaker system should be connected to the 4 ohm
tap of the amplifier.
IMPORTANT
to more than one set of terminals.
e When speakers are connected to COM-4Q/8Q Terminal Strip, NO Speakers / Driver Units with 100V LMTs
should be connected to the Terminal Strip marked COM-70V/100V (fitted with RED cover).
® Speakers should be connected only to either COM-4Q or COM-8(2 terminals as illustrated above but never
SSA-160°EM
Speaker Connection Guidelines....
COM 70V 100V
NEON
COM 70V 100V
COM 70V 100V
5W
10W >
20W 5w
30W 7.5W
40W 10W | =
COM COM
16
8
COM 70V 100V
1W 1 1.5W
—2W 3W
aw SW
(COM | | COM —)
SSA-160°EM
= В
20
High Impedance Speakers or Speakers Using A
100V Line Matching Transformer
e Only Driver Units / Horn Speakers / Column Speakers
with 100V Line Matching Transformers are to be
connected to COM-70V / 100V Terminal Strip.
e The Box Speaker / Driver Unit switch must be kept at
Driver Unit position.
e When any of the above speakers are connected to the
COM-70V / 100V Terminal Strip then NO Box speakers
should be connected to the COM-4Q/8Q Terminal Strip.
e The power drawn from the amplifier should not exceed
160 Watts.
Connecting Sixteen Driver Units with 100V LMT
16 Driver Units with 100V Line Matching Transformer
connected at 10 Watts tap can be operated.
Connecting a Combination of Driver Units and
Column Speakers with 100V LMT
8 Column Speakers with 100V LMT at 10 Watts and 16
Driver Units with 100V LMT at 5 Watts can be connected
together. The power drawn from the amplifier should not
exceed 160 Watts.
Connecting a combination of Wall and Ceiling
Speakers with 100V LMT
10 Ceiling Speakers with 100V LMT at 4 Watts and
20 Wall Speakers with 100V LMT at 6 Watts can be
connected together. The power drawn from the amplifier
should not exceed 160 Watts.
10
Speaker Connection Guidelines....
Use of 70 Volt Line
Aloudspeaker / Driver Unit with its LMT adjusted to the 15W tap, when connected to COM and 100V terminals on the
Amplifier's Terminal Strip will draw 15W from the Amplifier but when the same is connected to COM and 70V it will
only draw half power i.e. 7.5W. A good use of 70V line tap can be made in installations where large number of
Speakers / Driver Units are to be installed for more even distribution of sound.
Correct Phasing of Loudspeakers
e When two or more Speakers/Units are installed in the
same area and are facing the same direction, it is
essential that their cones/diaphragms act in unison.
й Otherwise the sound level of one speaker will be
. = cancelling the sound level of the other. To avoid any
mistake, the terminals of Box speakers and the Driver
= Units are marked '+' & '-'. Always connect the COM of the
/ Amplifier to '-' of speaker & 40/80 of the amplifier to the +'
N / of the speakers.
N
e In case of LMT's the COM of all the LMT's should be
connected to the COM of the red strip terminal of the
amplifier and the power tap to 100V line as shown in
figure.
IMPORTANT
e When 70 / 100 Volt line is being used, no speakers / driver units should be connected to 4Q / 8Q2 (Low
Impedance) Tap.
e Loudspeaker / driver unit should be connected to either COM-100V or COM-70V terminals, but never to
more than one set of terminals.
11
SSA-160°EM
Connecting SSA-160°EM To One BR-250M To Get A 410W Mono System
1.
MASTER AMPLIFIER SSA-160°EM
Connect Microphones and other Program Sources to the input jacks of
the MASTERAMPLIFIER, which is the SSA-160°EM.
The Pre-Out jack of SSA-160°EM should be connected to the Input jack of
the BR-250M. The sensitivity switch of the BR-250M should be at200mV.
In this manner the inputs connected to SSA-160°EM will feed both the
amplifiers creating a 410W output system.
Loudspeaker connections to both the amplifiers should be done
independently. Each of the amplifiers can be connected to either box type
speakers orto speakers using the 100V LMT but NEVER to both together.
Speaker system impedance should be matched to the output impedance
of the amplifier and thus should be connected to the corresponding tap of
the amplifier.
When connecting box speakers to an amplifier the Box Speaker / Driver
Unit switch should be set to the Box Speaker side and when connecting
driver units, wall, ceiling or column speakers with 100V LMT, the switch
should be turned to the Driver Unit side.
When speakers with 100V LMT are used, total power drawn should not
exceed 250W in case of BR-250M & 160W in case of SSA-160°EM
respectively.
Finally when operating the system, the Bass & Treble controls of the
individual amplifiers can be adjusted to give optimum tonal quality of
sound to suit the system requirements.
This kind of system is ideal where both high and low impedance speakers
are being used.
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CASSETTE PLAYER
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20W
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25 Driver Units with
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12
Connecting SSA-160°EM To One SPA-5000EM To Get A 660W Mono System
1
MICROPHONES
1.
MASTER AMPLIFIER SSA-160°EM
Connect Microphones and other Program Sources to the input jacks of
the MASTERAMPLIFIER, which is the SSA-160°EM.
The Pre-Out jack of SSA-160°EM should be connected to the Input jack of
the SPA-5000EM. The sensitivity switch of the SPA-5000EM should be at
200mV.
In this manner the inputs connected to SSA-160°EM will feed both the
amplifiers creating a 660W output system.
. Loudspeaker connections to both the amplifiers should be done
independently. Each of the amplifiers can be connected to either box type
speakers orto speakers using the 100V LMT but NEVER to both together.
Speaker system impedance should be matched to the output impedance
of the amplifier and thus should be connected to the corresponding tap of
the amplifier.
When connecting box speakers to an amplifier the Box Speaker / Driver
Unit switch should be set to the Box Speaker side and when connecting
driver units, wall, ceiling or column speakers with 100V LMT, the switch
should be turned to the Driver Unit side.
When speakers with 100V LMT are used, total power drawn should not
exceed 500W in case of SPA-5000EM & 160W in case of SSA-160°EM
respectively.
Finally when operating the system, the Bass 8 Treble controls of the
individual amplifiers can be adjusted to give optimum tonal quality of
soundto suit the system requirements.
. This kind of system is ideal where both high and low impedance speakers
are being used.
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13
SSA-160°EM
Typical Applications...
Connecting Four BR-250M And A SSA-160°EM For Making A1160 W Mono System
1.
Connect Microphones and other Program Sources to the input jack
sockets of the Master Amplifier, which is the SSA-160°EM.
Connect the Line-Out of the Master Amplifier to the first Input jack socket
of the first BR-250M (Booster A) using a patch-cord with 74" phone plugs
at both ends. The sensitivity switch next to the input jack sockets should
be towards 1V.
Second Input jack socket of Booster A should be connected to the first
input jack socket of the second BR-250M (Booster B). The sensitivity
switch of the second booster should also be at 1V.
. The third and the fourth BR-250M (Booster C and Booster D) should be
connected in the same way. A maximum of four boosters should be
connected in this way otherwise the line output of the Master Amplifier will
get loaded.
In this manner the inputs connected to the Master Amplifier will feed all the
five amplifiers creating a 1160W output system.
Loudspeaker connections to each of the five amplifiers should be done
independently. Each of the amplifiers can be connected to either Box type
speakers or to speakers using the 100V LMT but never to both together.
Speaker system impedance should be matched to the output impedance
of the amplifier and thus should be connected to the corresponding tap of
the amplifier.
. When connecting box speakers to an amplifier the Box Speaker / Driver
Unit switch should be set to the Box Speaker side and when connecting
driver units, wall, ceiling or column speakers with 100V LMT, the switch
should be turned to the Driver Unit side.
When speakers with 100V LMT are used, total power drawn should not
exceed 250W in case of BR-250M & 160W in case of SSA-160°EM
respectively.
Finally when operating the system, any adjustments in the tonal quality of
the sound if required can be made from the Master Amplifier.
(Refer to page 15 for illustration)
14
SSA-160°EM
Typical Applications...
Connecting One SSA-160°EM And Four BR-250M For Making A1160W Mono System
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SSA-160°EM
Specifications
Model SSA-160°EM
Power Output 220W RMS Max.
160W RMS at 10% THD
140W RMS at 5% THD
120W RMS at 2% THD
Output Regulation <2 dB no load to full load at 1kHz
Input Channels 5 x Mic. 0.65 mV / 4.7kQ
(Mic source impedance 500 to 1kQ)
2 x Aux.-1 & 2 100mV / 470kQ
Line Input 1V / 50kQ
Frequency Response 50 — 15,000 Hz + 3 dB
Signal to Noise Ratio 60dB
Tone Controls:
Switch at Box Speaker Position Bass: +10dB at 100Hz Treble: +10 dB at 10kHz
Switch at Driver Unit Position Bass: -10dB at 100Hz Treble: +10 dB at 10kHz
Pre-amp Output 200т\ / 60052
Line Output 1V / 1kQ
Output Taps for Speaker Matching | 4 & 8Q (for direct connections)
70 & 100V Line (for use with LMT)
Power Supply AC: 220-240V 50/60Hz; DC: 24V (2 x 12V Car Battery)
Protection AC: Fuse 3Amp. (T 3AL); DC: 10Amp. Circuit Protector
AC Power Consumption 300 VA
DC Power Consumption 4A
Dimensions W420 x H155 x D320 mm
Weight 13.6 kg approx.
+ Design and Specifications are subject to change without notice owing to continuous product upgradation.
* Technical specifications are subject to production tolerances.
AHUJA RADIOS - 215, Okhla Industrial Estate, New Delhi - 110 020, INDIA
Tel.: +91-11-26831549, 41612474 Fax: +91-11-26847287
E-mail : [email protected], [email protected]
Website: www.ahujaradios.com
Design and Specifications are subject to change without notice owing to continuous
product up-gradation
Technical specifications are subject to production tolerances.
We cannot be held responsible for printing errors, should they occur.
RHUJR is a registered trademark of Ahuja Radios in India and other countries.
© Copyright Ahuja Radios, 2014. All rights reserved. Any unauthorized reproduction or
use of logos, images or design elements is strictly prohibited by law.
No part of this compilation may be reproduced in any manner or translated without
written permission.
®
AHUJR
E.&O.E. 4K/10/14/R3