1. Balanced Audio, Speakers, and Amplifiers Created by: Sarah Hutchens & Jacob Hanchett

2. What is balanced audio? ●Method of minimizing unwanted noise from interference in audio cables. ●Uses an extra line: ○ Hot line (positive) ○ Cold line (negative) ○ Earth line

3. How does balanced audio work? ●Two identical signals, which are opposite polarities, will cancel each other out. ●Cables used in these systems are designed to: ○ carry two versions of the signals ○ manipulate the polarities of these signals to eliminate noise

5. Unbalanced Audio ●Use only two lines to transmit the audio signal ○ Hot line (which carries the signal) ○ Earth line ●Common in short cables ●Common in less professional applications ●Any single-pin connector used for audio is unbalanced

6. Speakers ●Speakers are the final translation machine ●Voltage and amplitude change the sound ●Takes the amplified electrical signal and translates it back into physical vibrations, by the drivers, to create sound waves

7. Parts of a speaker

8. Types of Drivers ●Woofers ○Biggest drivers ○Produce low frequency sounds

9. Types of Drivers Cont. ●Midrange ○ Produce a range of frequencies in the middle of the sound spectrum

10. Types of Drivers Cont. ●Tweeter ○ Smallest driver ○ Produce the highest frequencies

11. Amplifiers ●Amplifies the strength of the electrical signal ●Signal is sent to the speaker ●Changes alternating current (AC) into direct current (DC) to work properly ●The electrical signal from the microphone is not strong enough to make the speakers work

12. Amplifiers Cont. ●Transistors ○ Heart of most amps ○ Uses conductors and semiconductors ○ It boosts the voltage

13. Amplifier Circuit

14. Summary ●Use the correct wires for the best sound and safety of the equipment ●Speakers change the electrical signal back into sound by vibrating the drivers ●Amplifiers amplify the strength of electricity

15. Bibliography ● www.mediacollege.com www.mediacollege.com ● http://www.howstuffworks.com/amplifier.htm http://www.howstuffworks.com/amplifier.htm ● http://www.howstuffworks.com/speaker.htm http://www.howstuffworks.com/speaker.htm

16. Thanks for listening! Hope you learned a little something about balanced/unbalanced audio, speakers and amplifiers!