Electro Acoustical Sound System Guide

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Electro Acoustical Sound System Guide

• Presented by eng. Kiril Yanev
• studiobalkandji_at_gmail.com
• 0888 393278

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Loudspeakers

• Electro-dynamic
• Electro-static
• Ribbon

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Loudspeaker Enclosures

• Closed box
• Vented box
• Horn
• others
• (Baffle,
• Transmission line)

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Parameters of the loudspeakers
Input Connections Screw Terminal
Frequency Response (-10 dB) 50 - 20,000 Hz
Internal Crossover Yes
Sensitivity 1 W/1 m 99 dB
Max. SPL/1m (calc) 129 dB
Coverage (Nominal -6 dB) H 60/110 long throw/short throw
Coverage (Nominal -6 dB) V 70/90 long throw/short throw
System Power Handling (Continuous/Program/Peak) 250/500/1000 Watts
LF Transducer 12-inch
HF Transducer 1.25-inch DH3/2010A compression driver (1-inch exit)
Crossover Frequency 2000 Hz
Nominal Impedance (Passive) 8 O

• power
• sensitivity
• impedans
• directivity
• others

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Parameters of the amplifiers
Amplifier Gain 32 dB
Continuous Rated Power (1 kHz, THD 1) 4? 1100 Watts
Continuous Rated Power (1 kHz, THD 1) 8? 600 Watts
Crosstalk lt lt -80 dB at 1,000 Hz
Frequency Response 15 - 40,000 Hz
Impedance 2/4/8 ?
Input Impedance (Balanced) 20 kO
Input Sensitivity 5.8 dBu
Intermodulation Distortion (SMPTE) lt 0.02
Signal-to-Noise Ratio (A-weighted) 107 dB
Slew Rate 35 V/µs
Topology Class-H
Total Harmonic Distortion lt 0.05

• power
• sensitivity
• voltage gain
• others
• Choosing the right amplifier
• (100V, low impedance)

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Power amplifiers 100 V line

• Amplifiers output Is connected to step-up
  transformer. Every speaker part of the line has
  step-down transformer. The principle is the same
  as high voltage power distribution lines.

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Grouping the loudspeakers

• Conventional loudspeakers

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Grouping the loudspeakers

• Sound column
• Little space between transdusers gt good HF
  response
• Long length of the line gt good LF directivity

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Grouping the loudspeakers

• Groupped conventional loudspeakers
• line array system

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Sound System Guide - Halls

• Small installation single center loudspeaker
• Small Hall
• Small Church
• School
• Classroom
• Presentations

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Sound System Guide - Halls

• Small installation left/right loudspeaker
• mono subwoofer ????????? ?? ????? ????
• Small church
• School
• Concert Hall
• Presentations

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Sound System Guide - Halls

• Small installation - 5.1 surround
• Small hall
• School cinema
• Presentations

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Sound System Guide - Halls

• Small installation distributed ceiling
• speakers (100V)
• Exhibition
• Ballroom
• Conference hall

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Sound System Guide - Halls

• Small installation distributed ceiling
• speakers (100V)
• Exhibition
• Ballroom
• Conference hall

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Sound System Guide - Halls

• Medium installation central cluster with
  additional infills and balconfills
• Presentations
• Conference hall

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Sound System Guide - Halls

• Medium installation corridor type with several
• delay lines
• Evangellist church
• Conference hall
• Long halls

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Sound System Guide - Halls

• Medium installation with several
• groups of loudspeakers
• Conference hall
• University hall
• Suitable for wide halls

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Sound System Guide - Halls

• Medium installation sound column
• airports
• Conference hall
• Shopping malls
• Suitable for reverberant spaces

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Sound System Guide - Halls

• Medium install bar/disco with
• multiple zondes
• Discos
• Caffe
• Bars

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Sound System Guide - Halls

• Big installation - hall
• Conference hall
• Multifunctional hall

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Sound System Guide - Halls

• Big installation - theatre
• (groups of loudspeakers with special
  functionallity)
• Drama theatres
• Multifunctional halls

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Sound System Guide - Halls

• Big installation - line array
• Concert hall
• Arena
• Long halls

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Sound System Guide - Cinema

• Acoustical requirements
• RT60 (500Hz)lt0,8s
• Deviation from RT60 (500Hz) for other frequencies
  according to Dolby standart

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Sound System Guide Cinema

• Acoustical requirements
• Without first reflections (difference from
  concert halls)
• Noise level NC30-NC35
• Sound proofing

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Sound System Guide - Cinema

• Screen Loudspeakers
• They must provide 105dB SPL at ? of the length of
  the hall
• (simultanious work of the three channels provide
  approx 5dB more)

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Sound System Guide - Cinema

• Screen loudspeakers

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Sound System Guide - Cinema

• Surround loudspeakers
• number 12-16 (4 on the rear wall, 3-4 on the
  side walls)
• minimum (for small halls) 8 (2 on the rear wall,
  3 on the side walls)
• directions first row of surrounds at ? from the
  rear wall
• last row at minimum 2-3 meters from the rear
  wall

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Sound System Guide - Cinema

• Subwoofers
• Use of 18 speakers
• number one piece on every 675 cubic meters
• Always round-up to a bigger number
• Sometimes is appropriate to put more, just for
  bigger effect

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Sound System Guide - Studio

• TV and Radio Studio
• Hard requirements for noise (NC20-NC25)
• Functional scheme of Sound Recording Studio
• 1. Control room
• 2. Live room
• 3. Dead room (voicover, vocals)
• 4. Machine room
• 5. Room for relax

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Sound System Guide - Studio

• Sound recording studios (acoustics of the control
  room)
• RT60 0,2-0,4s
• Without first reflections (Reflection Free Zone
  gt20ms)
• Control of the standing waves (Bass Traping)
• LEDE (live end-dead end)

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• Thanks for your attention!!!
• studiobalkandji_at_gmail.com
• 0888 393278