What Do You Know About Acoustics
If you are an event manager, musician or dancer you know how important a room`s acoustics is. If you try and perform in a room with bad acoustics the chances of the audience not hearing you are much higher. How much do you about how to maximize the acoustics of different room shapes? Test yourself by taking the quiz below.
- 1.A tuned trap designed to absorb a narrow frequency area is called a
- A.
Diffuser
- B.
Active trap
- C.
Diffusive trap
- D.
Helmholtz resonator
- E.
Resonant absorber
- 2.What is TTS
- A.
The brain's ability to eliminate things it doesn't want to hear.
- B.
The brain's ability to adjust your hearing both in frequency response and sound pressure level to help protect your hearing mechanism.
- C.
The brain's ability to enhance things it doesn't want to hear.
- D.
The brain's ability to separate one sound amoungst many.
- 3.The unit of measurement for sound absorbtion is
- A.
Nano-Webers
- B.
Sabins
- C.
MicroFarads
- D.
Pascalls
- E.
STC
- 4.Glass would generally have
- A.
A negative value of absorption co-efficient
- B.
An absorption co-efficient greater than 1
- C.
A high absorption co-efficient
- D.
A low absorption co-efficient
- E.
None of the above
- 5.When planning a rectangular room, odd sized ratios can be used to....
- A.
Lenghten the reverb time.
- B.
Minimize transmission noise
- C.
Give an even distribution of room modes
- D.
Encourage standing waves
- E.
Eliminate the need for amplification
- 6.What is used to randomize and even out the acoustic energy in a room?
- A.
A diffuser
- B.
A disperser
- C.
An acoustic evener
- D.
A decoupler
- E.
A concave surface
- 7.The physical seperation of surfaces to limit the transimission of vibrational energy is called:
- A.
Room modes
- B.
Tuning
- C.
Decoupling or floating
- D.
Dispersive silencing
- E.
Absolution
- 8.An anechoic chamber is...
- A.
A reverberation or echo chamber
- B.
A totally air tight room
- C.
An isolated, reflection-free space
- D.
A room used to store tape machines
- E.
None of the above
- 9.Room modes occur at frequencies whose wavelengths are
- A.
The same as the distance between two surfaces
- B.
Half of the distance between two surfaces
- C.
One third of distance between two surfaces
- D.
One quater of the distance between two surfaces
- E.
All of the above
- 10.A LEDE control room:
- A.
Has a reflective front and absorbtive rear
- B.
Has an dead front and a dead rear
- C.
Has a reflective front and absorbtive rear with no low frequencies
- D.
Has a dead front and live rear with early reflections eliminated
- E.
Has a reflective front and rear panel absorbers
- 11.An absorber that uses fiberglass or foam to obstruct the travel of sound waves is a:
- A.
Membrane absorber
- B.
Helmholtz resonator
- C.
Porous absorber
- D.
Low mode absorber
- E.
Tyner trap
- 12.Mechanical decoupling of recording environments is required for which purpose?
- A.
To minimise the transmission of outside airbourne and structural noise into the recording area
- B.
To allow heat detention to ensure an even studio temperature
- C.
To obtain correct room ratio's for realistic RT 60 time
- D.
To allow enough space between outer and inner walls to construct bass traps
- E.
To allow for a more natural room mode structure
- 13.A soft porous material would generally have:
- A.
A negative value of absorption co-efficient
- B.
An absorption co-efficient greater than 1
- C.
A high absorption co-efficient
- D.
A low absorption co-efficient
- E.
A sliding absorption co-efficent
- 14.Helmhotz resonator 'traps' absorb frequencies in the
- A.
Low mid frequency range
- B.
High frequency range
- C.
Upper-mid range
- D.
Free range
- E.
A and c
- 15.A rating system designed to compare the transmission loss charactristics of various acoustical materials and constructions describes:
- A.
STC
- B.
Sabines Co-efficient
- C.
Transmission Loss
- D.
AES
- E.
Mass Law
- 16.The main reason we would float a floor is to:
- A.
Isolate our space from structural noise
- B.
Maintain a constant reverb time for all audio frequencies
- C.
Isolate our space from electrical noise
- D.
Provide even distrubution of room modes
- E.
Provide a pathway for little people in our studio
- 17.A wave form with a short wavelength would be :
- A.
Louder
- B.
Direct
- C.
High Freq
- D.
Quieter
- E.
Low Freq
- 18.What is RT60
- A.
The amount of time it takes a reverberant field to decay 20 dB
- B.
The amount of time it takes a reverberant field to decay 60 dB
- C.
The amount of time it takes a reverberant field to decay 10 dB
- D.
The amount of time it takes reverberant field to decay 6 dB
- E.
The amount of time it takes reverberant field to decay 12 dB
- 19.The three types of room modes are:
- A.
Axial, Tangential, and Oblique
- B.
Axial, Tangential and Transverse
- C.
Axial, Oblique, and Transindential
- D.
Axial, Tangential, and Obtuse
- E.
Axis, Obtuse, Tangential
- 20.Which of the following can be used to absorb low frequencies?
- A.
Panel absorbers
- B.
Drapes
- C.
Fiberglass
- D.
Carpet
- E.
Fuzz
- 21.Which of the following would be an effective high frequency absorber?
- A.
Panel absorbers
- B.
Concrete
- C.
Carpet
- D.
Glass
- E.
A and D
- 22.What is constructive interference
- A.
When reflecting sound waves decrease a sound's amplitude
- B.
When reflecting sound waves increase a sound's amplitude
- C.
When the frequency of the second sound wave is exactly twice the original sound wave
- D.
25 times that of the first mode
- E.
When there is excessive bass trapping
- 23.What will affect the reverb time of a room?
- A.
The size of the room.
- B.
Type of materials used in the interior of the room.
- C.
The type of seals used on the door frames.
- D.
A and C
- E.
A and B
- 24.What 3 things are necessary to stop the transmission of sound from 1 environment to the next
- A.
Mass, Density, Space
- B.
Mass, Density, Fiberglass
- C.
Weight, Density, Space
- D.
Mass, mass, and more mass
- 25.Neoprene is commonly used to
- A.
Absorb low frequencies.
- B.
Decouple construction elements.
- C.
Absorb high frequencies.
- D.
Create low frequency enhancers.
- E.
Increase the bass response of the room.
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