11. What is the total impedance of a speaker system using two 8 Ohm speakers connected together?
8 Ohm divided by 2 equals 4
12. What is the difference between a graphic and a parametric equaliser?
A graphic equalizer consists of a bank of sliders for boosting and cutting different bands or frequencies of sound and a parametric equalizer is a multi-band variable equalizer used in recording live sound.
13. What is the frequency range of human hearing?
20 Hz – 20 KHz
14. What happens if two signals are out of phase?
Out of phase means that they are at opposite ends of the cycle at a given moment.If two signals are out of phase the sound usually becomes altered and distorted.
15. Why are crossovers necessary in speakers systems?
No speaker is suitable for reproducing the entire audio range, becomes necessary to split signal up into different ranges in order that each speaker receives correct signal.
16. What is an insert point?
A break point in the signal path that allows external devices to be connected in line.
17. What do we turn off first when finished a show?
The master faders
18. Identify four types of event where an audio crew may be required?
- Concerts
- Festivals
- Musicals
- Public Addresses
19. How does clipping occur and why is it a problem?
Clipping occurs when an amplifier is over driven. This is a problem as it can cause the amplifier to output power in excess of its published ratings.
20. What is the difference in dispersion (coverage) between high and low frequencies?
High frequencies in regards to coverage create more sound or a higher range of sound compared to low frequencies, therefore producing more dispersion.
21. Describe the routine maintenance and inspection procedures that should be performed on audio equipment.
Cleaning: using a soft brush to remove dust from control surfaces regularly. Remove air filters from any equipment and clean. Manipulation of switches, faders, physical examination and electrical safety.
No comments:
Post a Comment