Rules to follow for successful indoor audio.
1. Donât set up too many speakers. This will cause echoes, dead spots and oddball reflections. Remember, the presenter is not a stereo sound source. Use only enough speakers to cover the area. Be aware of the coverage with just one speaker. Aim the speakers to cover the crowd without too much overlap. This is very important as the size of the area increases.
2. Use full range speakers for small groups, horns for larger auditoriums. Remember that too much bass will cause a great deal of âboominessâ towards the back of the room. Thatâs great for rock and roll but will be counter-productive where you are trying to sell fine antiques.
3. Elevate the speakers if possible. This will stop the feedback from reflected sound bouncing off the front row and help the folks in the back row hear better.
4. Ring out the system before your event â turn on our sound systems and find out how high you can turn your system with all microphones on (open) before feedback. Turn up the volume while talking until you start hearing a faint ringing sound. Back off the volume a bit and mark that spot on the control. Then, when the event starts, you know where the maximum point is. Remember that the presence of the crowd can affect the actual final point. If you know the limits before you start, the better off you will be.
5. Donât try to use too many microphones. Every time you double the number of open microphones in the system, you will have to reduce your amplification by 3dB (half as loud as before). For most events 2-3 microphones should be all you need active at any time.
6. Finally, you may have enough gain in the system to be too loud. Remember that hearing comfort is extremely important to your bidders. If your system is too loud, they may leave before the end of the event just to get a break from your PA. The following illustration shows you an actual room where the systems have been set up for maximum gain. This set up will work in rooms that seat up to several hundred people. In
larger indoor spaces, such as warehouses, you can have problems with time delays and echoes similar to those described in the next section, outdoor installations.
1. Keep the microphone as close as possible to the presenter.
2. Set the speakers away from you. Donât put them too far away or you will get long delays where you say something and the sound is heard ½ to 2 seconds later. Working in an echo chamber is no fun and confusing to the crowd.
3. Keep the speakers as close together as possible. Remember that sound only travels around 1,100 feet per second. If you place your speakers too far apart an echo will result. Ideally the speakers will be right next to each other pointed in different directions where they can be heard anywhere. Each speaker should cover its own unique territory. For example, you have your speakers placed about 225 feet apart. Your customer is standing close to the first speaker. He will hear what you say immediately from the first speaker, but the sound from the second speaker, 225 feet away, wonât get to him until Âź second later. He hears a confusing and annoying echo. Since he canât understand the presentation, you have lost your customer and a potential sale.
A Bad Setup
In this set up the speakers are so far apart that the sound is getting to the audience at two separate times. They get a confusing echo about four tenths of a second apart.
A Good Setup
By placing the speakers together, the confusing echo is gone and the speaker can be heard
more clearly. The audience can follow the presentation.
4. Watch which way the wind is blowing. It can blow sound around and interfere just as well as hats, litter and certain species of small dogs. Take advantage of this if you can by pacing speakers upwind if it looks like a windy day. For Source Info, Click Here!
Find below a list of the top
Public Address Systems in Doha, Qatar:
- THERMAL ARABIA TRDG & CONTG CO WLL
Location: BIRKAT AL AWAMER,
Phone: 74797094;33344728;44367499
Timings:8.00AM-5.00PM : SAT - THUR
Key Personnel:DR SYMON THOMAS, M D
RENJITH RAJENDRAN, G M
MUJEEB UDDIN MOHD, A G M
VIPIN P V, HEAD - SALES
THARUN K G, HEAD - OPS
- ELSTO ELECTRONICS & ELECTRICAL TRADING
Location: SHOP 42, BLDG 10, BARWA VILLAGE, AL WAKRAH,
Phone: 44757982;71100069 - MOBILE
Timings:
Key Personnel:MOHD RAHIL, OPS MNGR
- ELECTRA - AL SHAGHAIRI TRADING & CONTRACTING CO WLL (TRADING DIV)
Location: OFFICE C-102 & C-103, BLDG 2, BLOCK 31, SAFWA BLDG, BARWA COMM AVENUE, ABU HAMOUR
,
Phone: 40016386;40052800
Timings:8.00AM-6.00PM
Key Personnel:M N Haris , MNG DIR
RAMACHANDRAN, FIN MNGR
- CITY CENTRE ELECTRONIC SERVICES WLL
Location: BLDG 20, ST 320, NAJMA,
Phone: 44439394
Timings:7.30-12.30/3.30-6.30
Key Personnel:JITHIN JOSE, G M
- DIME MARINE SERVICES
Location: OFFICE 7, GR FLR, AL GHANIM COMM CENTRE, BLDG 474, ST 340, ZONE 55, SALWA RD,
Phone: 44439397 - MAIN OFFICE;30035567 - AL KHOR BR;71344378 - BIRKAT AL AWAMER BR
Timings:8.00AM-6.00PM : SAT - THUR
Key Personnel:PRASANTH PRABHAKARAN, BR MNGR
., .
- FIRELINK WLL
Location: BIRKAT AL AWAMER,
Phone: 44925040;44925048
Timings:8.00AM-5.30PM : SUN - THUR
Key Personnel:ZUBAIR HABEEB, G M
- FIRETECH TRADING CONTRACTING WLL
Location: OFFICE 10, 2ND FLR, BLOCK 55, SAYER BLDG, ST 965, ZONE 56, BARWA COMM AVE,
Phone:
Timings:8.00-1.00/3.00-6.00
Key Personnel:SURESH CHANDRAN R, G M / C E O
- FIRST ADVANCED SAFETY SYSTEMS
Location: OFFICE 20 B, 1ST FLR, AL MIRQAB COMPLEX, BLDG 66, ST 840, AREA 39, FRIL AL NASR,
Phone: 77937477 - MOBILE;40012127
Timings:8.00AM-5.00PM
Key Personnel:ABDELHAMID FATNASSI, M D
WISSEM AMARA, FIN DIR
- H POLYBIT TRADING & CONTRACTING
Location: OFF 602, 6TH FLR, BLDG 86, ZONE 39, ST 340, AL MAHA COMPLEX, SALWA RD ,
Phone: 44311145;44311146
Timings:9.00AM-6.00PM : SAT - WED;9.00AM-1.00PM : THUR
Key Personnel:ENGR NANDU S V, DIV HEAD
ENGR LIJIN RAJU, OPS MNGR
- MASTER SYSTEMS
Location: BARWA VILLAGE, AIRPORT RD,
Phone: 44763755
Timings:8.00AM-6.00PM : SAT - THUR
Key Personnel:BAIJU VASUKKUTTAN, BR MNGR
TOJO JOSEPH, MNGR - CALIBRATION DIV
TIJO THANKACHAN, MNGR - AUTOMATION / E & I DIV
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PUBLIC ADDRESS SYSTEMS
Find below a list of the top products suppliers of
Public Address Systems in Doha, Qatar:
- 2N
- Ip Video Intercom, Gsm Gateways, Ip Public Address Systems - A E X
- - ACEITES
- Audio Visual Systems, Public Address Systems - AHUJA
- Public Address Systems - AITES
-
- APART
- Speakers, Amplifiers, Mikes, Conference Systems - ATEIS
- Public Address Systems, Voice Alarm Systems - ATIES
- Voice Evacuation / Public Address System S - AUCHAN
- Units & Amplifiers - AUDAC
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