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A PA system or Public Address system is an electronic sound amplifier and distributor which can be used to make announcements in places where sound pollution is at its peak. PA systems are widely used in Dhaka, and Bangladesh in general.
How does a PA system work?
A PA system consists of one or more microphones , speakers, a mixer (to regulate volume, tone and balance of different voices), and an amplifier. The microphone transforms sound into electrical signal, it is plugged into a mixer,it allows multiple channels of sound to be broadcast at varying levels.The amplifier magnifies the audio signal, loudspeakers transforms the electrical signal back into sound.
Who and where can it be used?
PA system devices are mainly used in railway stations, offices, schools or any large building where loud sound is required so that it is still audible over all the noise. It is also used in places where announcements are made, like stadiums, museums and other public venues. A sound system is required for any conference and meeting. They are an integral part of any modern building, public and household alike. These systems play a major role in security too, ensuring household safety of millions of people around the world.
Benefits of PA systems
In today’s world, communication is one of the keys to running any business, organization or any other type of work firm. Lots of people work together in any company. To establish proper communication between all concerned people in a work-space, PA system are extremely important and helpful. The PA system allow a person or a group of people to communicate and voice their message directly to all people. Not only does this help to establish proper workflow in an organization, but it also furthers security and redundancy in production. With the help of PA systems, notifications for particular people or groups of people, enforcing standards, maintaining security, addressing issues, etc. can be easily done. Without PA systems, these functions would require a high amount of additional time, labor and resources.
Top brands and model:
TOA – TOA has a long reputation of providing people with proper sound systems for all their uses. Based in Japan, they are famous for their decades of top quality sound products, ranging from microphones and amplifiers, to wireless and security products. Along with the production of regular use systems, TOA conference system keeps an eye out for the future, constantly developing new and advanced products for the next generation. Their top models are the A-1000 AS series amplifiers for small events or places like small offices, the A-1724 for a broader coverage for big supermarkets, mosques, factories and the like, and the A-2000 series for massive scale applications like big complexes and events.
Ahuja – Ahuja Radios is India’s largest manufacturer and exporter of PA system. Their experience and knowledge, dating back from their establishment in 1976, is reflected in the products. They have already gained much fame for their long lasting and high quality products. Their product lineup is one to suit all types of PA system applications.
TOA power amplifier well-suited for broadcasting paging and supplying background music in restaurants, pubs, shops, houses of worship and so on. This amp is simple to operate and benefts from separate bass and treble controls. A muting facility on the Mic 1 imput enables paging announcements to be made at any time, with the music automatically returning to the normal level once the announcemet is finished.
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Types on TOA PA Amplifier
| Power Source | 220 – 240 V AC, or 24 – 30 V DC |
|---|---|
| Rated Output | 30 W |
| Power Consumption | 34 W (EN60065), 78 W (AC operation at rated output), 2 A (DC operation at rated output) |
| Frequency Response | 50 – 20,000 Hz (±3 dB) |
| Distortion | Under 1% at 1 kHz, 1/3 rated power |
| Input | MIC 1 – 3: -60 dB*, 600 Ω, balanced, phone jack AUX 1,2: -20 dB*, 10 kΩ, unbalanced, RCA pin jack |
| Output | Speaker out: Balanced (floating) High impedance: 330 Ω (100 V), 170 Ω (70 V) Low impedance: 4 Ω (11 V) Rec out: 0 dB*, 600 Ω, unbalanced, RCA pin jack |
| Phantom Power | DC +21 V (MIC 1) |
| S/N Ratio | Over 60 dB |
| Tone Control | Bass: ±10 dB at 100 Hz Treble: ±10 dB at 10 kHz |
| Muting | MIC 1: Mutes other input signals by 0 – 30 dB attenuation |
| Indicator | Power, signal, peak |
| Finish | Panel: ABS resin, black Case: Steel plate, black |
| Dimensions | 420 (W) × 100.9 (H) × 280.3 (D) mm (16.54″ × 3.97″ × 11.04″) |
| Weight | 5 kg (11.02 lb) |
| Power Source | 220 – 240 V AC, or 24 – 30 V DC |
|---|---|
| Rated Output | 60 W |
| Power Consumption | 72 W (EN60065), 150 W (AC operation at rated output), 4 A (DC operation at rated output) |
| Frequency Response | 50 – 20,000 Hz (±3 dB) |
| Distortion | Under 1% at 1 kHz, 1/3 rated power |
| Input | MIC 1 – 3: -60 dB*, 600 Ω, balanced, phone jack AUX 1,2: -20 dB*, 10 kΩ, unbalanced, RCA pin jack |
| Output | Speaker out: Balanced (floating) High impedance: 170 Ω (100 V), 83 Ω (70 V) Low impedance: 4 Ω (15.5 V) Rec out: 0 dB*, 600 Ω, unbalanced, RCA pin jack |
| Phantom Power | DC +21 V (MIC 1) |
| S/N Ratio | Over 60 dB |
| Tone Control | Bass: ±10 dB at 100 Hz Treble: ±10 dB at 10 kHz |
| Muting | MIC 1: Mutes other input signals by 0 – 30 dB attenuation |
| Indicator | Power, signal, peak |
| Finish | Panel: ABS resin, black Case: Steel plate, black |
| Dimensions | 420 (W) × 100.9 (H) × 280.3 (D) mm (16.54″ × 3.97″ × 11.04″) |
| Weight | 7 kg (15.43 lb) |
| Power Source | 220 – 240 V AC, or 24 – 30 V DC |
|---|---|
| Rated Output | 120 W |
| Power Consumption | 124 W (EN60065), 260 W (AC operation at rated output), 8 A (DC operation at rated output) |
| Frequency Response | 50 – 20,000 Hz (±3 dB) |
| Distortion | Under 1% at 1 kHz, 1/3 rated power |
| Input | MIC 1 – 3: -60 dB*, 600 Ω, balanced, phone jack AUX 1,2: -20 dB*, 10 kΩ, unbalanced, RCA pin jack |
| Output | Speaker out: Balanced (floating) High impedance: 83 Ω (100 V), 42 Ω (70 V) Low impedance: 4 Ω (22 V) Rec out: 0 dB*, 600 Ω, unbalanced, RCA pin jack |
| Phantom Power | DC +21 V (MIC 1) |
| S/N Ratio | Over 60 dB |
| Tone Control | Bass: ±10 dB at 100 Hz Treble: ±10 dB at 10 kHz |
| Muting | MIC 1: Mutes other input signals by 0 – 30 dB attenuation |
| Indicator | Power, signal, peak |
| Finish | Panel: ABS resin, black Case: Steel plate, black |
| Dimensions | 420 (W) × 100.9 (H) × 360.3 (D) mm (16.54″ × 3.97″ × 14.19″) |
| Weight | 10.8 kg (23.81 lb) |
| Power Source | 220 – 240 V AC, or 24 – 30 V DC |
|---|---|
| Rated Output | 240 W |
| Power Consumption | 238 W (EN60065), 520 W (AC operation at rated output), 15 A (DC operation at rated output) |
| Frequency Response | 50 – 20,000 Hz (±3 dB) |
| Distortion | Under 1% at 1 kHz, 1/3 rated power |
| Input | Line in: 0 dB*, 10 kΩ, balanced, screw terminal 100 V line in: 40 dB*, 330 kΩ, unbalanced, screw terminal Power remote control: Make contact |
| Output | Loop out: 0 dB*, 10 kΩ, balanced, screw terminal Speaker out: Balanced (floating) High impedance: 42 Ω (100 V), 21 Ω (70 V) Low impedance: 4 Ω (31 V) |
| S/N Ratio | Over 60 dB |
| Tone Control | Bass: ±10 dB at 100 Hz Treble: ±10 dB at 10 kHz |
| Indicator | Power, signal, peak |
| Ventilation | Fan cooling |
| Finish | Panel: ABS resin, black Case: Steel plate, black |
| Dimensions | 420 (W) × 100.9 (H) × 351.3 (D) mm (16.54″ × 3.97″ × 13.83″) |
| Weight | 13.2 kg (29.1 lb) |
Equipped with 6 Microphone inputs and 5 AUX inputs (simultaneous use of 9 inputs possible), the A-1724 PA amplifier of 240 W is designed to suit the following PA system applications: announcements, BGM, and broadcasting in mosques, churches, large rooms, and factories.
| Power Source | 220 – 230 V AC, 50/60 Hz |
|---|---|
| Rated Output | 240 W |
| Power/Current Consumption | 532 W (rated output), 220 W (EN60065), 60 mA or less (when power switch is OFF) |
| Frequency Response | 50 Hz – 20 kHz (±3 dB) |
| Distortion | 2 % or less at 1 kHz, rated power |
| Input | MIC 1 – 6: -60 dB*, 600 Ω, electronically-balanced, combined type of XLR-3-31 equivalent and phone jack AUX 1 – 2: -20 dB*, 600 Ω, electronically-balanced, combined type of XLR-3-31 equivalent and phone jack (Either MIC 5 or AUX 1, and either MIC 6 or AUX 2 selectable) AUX 3 – 4: -20 dB*, 10 kΩ, unbalanced, RCA pin jack AUX 5: -20 dB*, 10 kΩ, unbalanced, combined type of XLR-3-31 equivalent and phone jack PWR AMP IN: 0 dB*, 600 Ω, unbalanced, RCA pin jack (An equalizer or other signal processor connectable between LINE OUT and PWR AMP IN terminals) |
| Output | REC: 0 dB*, 600 Ω, unbalanced, RCA pin jack LINE: 0 dB*, 600 Ω, unbalanced, RCA pin jack SPEAKER SELECTOR: 2 zone, high impedance (100 V line/42 Ω), individual selector key, M4 screw terminal DIRECT SPEAKER OUT: High impedance (100 V line/42 Ω), M4 screw terminal Low impedance (4 – 16 Ω), M4 screw terminal (Both Low and High impedance terminals cannot be used at the same time.) |
| Phantom Power | ON or OFF for each MIC1 – 6 with switch setting (+17 V DC) |
| S/N Ratio (Band Pass : 20 Hz – 20 kHz) | 100 dB or more (Master volume: min) 76 dB or more (Master volume: max) 60 dB or more (MIC 1 – MIC 4) 53 dB or more (MIC 5, MIC 6) 76 dB or more (AUX 1 – AUX 5) |
| Tone Control | Bass: ±10 dB at 100 Hz, Treble: ±10 dB at 10 kHz |
| Control Input | REMOTE VOLUME: M3 screw terminal POWER REMOTE: No-voltage make contact input, open voltage: 28 V DC (when the unit’s power is OFF), short-circuit: 10 mA or less, M3 screw terminal |
| Indicator | 5 point LED output level meter, Power indicator LED, Zone indicator LED |
| Operating Temperature | -10 ℃ to +40 ℃ |
| Finish | Panel: ABS resin, black, hairline Case: Steel plate, black |
| Dimensions | 420 (W) × 107.7 (H) × 367 (D) mm |
| Weight | 13.5 kg |
| Accessory | Power cord ……1, Terminal block cover ……1, Terminal block cover mounting screw ……2 |
TOA’s newly launched A-1000 AS Series Mixer Power Amplifiers come with a 5-zone speaker selector that is suitable for small scale broadcasting or background music usage. An all call button allows broadcasting to be made to all 5 zones. This is ideal for use in places such as supermarkets, factories, offices and more.
Features of Amplifier:
– 3 Mic inputs, 2 Aux inputs, 1 pre-output
– Speaker output of high impedance (100V line) and low impedance (4-16W)
– Muting function enables Mic 1 input to have priority over other inputs
– 5 zone speaker selector and 1 all call
– Bass and treble control
– 5-step LED signal indicator
– Output short circuit protection, and thermal protection circuitry prevents failure due to overheat.
The A-230 is a power amplifier well-suited for broadcasting paging and supplying background music in restaurants, pubs, shops, houses of worship and so on.
| Power Source | 220 – 230 V AC, or 12 V DC |
|---|---|
| Rated Output | 30 W |
| Power Consumption | 34 W (AC operation at IEC60065) |
| Current Consumption | 4.5 A (DC operation at rated output) |
| Frequency Response | 50 Hz – 20 kHz |
| Distortion | 1 % or less at 1 kHz, 1/3 rated power |
| Input | MIC 1 – 3: -60 dB* (1.0 mV), 600 Ω, unbalanced, phone jack AUX: -20 dB* (100 mV), 10 kΩ, unbalanced, RCA pin jack |
| Output | Speaker out: Floating balanced High impedance: 330 Ω (100 V) Low impedance: 4 Ω (11 V) |
| S/N Ratio | 60 dB or more (MIC 1 – 3) 70 dB or more (AUX) |
| Tone Control | Bass: -10 dB at 100 Hz Treble: -10 dB at 10 kHz |
| Muting | MIC 1 overrides other Mic inputs and AUX input with 0 – 30 dB attenuation, attenuation by MIC 1 input |
| Indicator | Power LED, Signal LED |
| Finish | Panel: ABS resin, black Hair Line Case: Steel plate, black |
| Dimensions | 350 (W) × 105 (H) × 240 (D) mm (13.78″ × 4.13″ × 9.45″) |
| Weight | 3.5 kg (7.72 lb) |
