Questions For Review
1. Microphone signals are at a low voltage level, typically milliVolts, where 1 mV = 0.001 V, and are low power. Speaker signals are at "line level," typically a few volts, and are capable of provide Watts of power to the speakers.

2. A pre-amp cannot provide sufficient output power to drive speakers, so a very soft sound, if any, would come out of the speakers.

3. Pre-amplifier functions:

• boosts the voltage of certain signals, such as from a turntable cartridge
• provides controls to alter the source signals such as volume, bass, treble, loudness, and filters
• routes signals from various sources to amplifier and speakers or to tape deck for recording

4. Tone controls are after the tape monitor switch and have no effect on the recorded signals.

5. Hi-fidelity refers to the capability of reproducing high-quality sound, as if one were listening to a live recording.

6. Poor reproduction creates sound that is not at all reminiscent of live musical sound.

7. Surround sound uses four or more speakers to produce ambience as well as stereo sound, in order to simulate three-dimensional audio and make the reproduction more realistic.

8. Tape monitor enables one to listen directly to a source signal or to a recorded signal moments after it has been recorded.

9. Surround-sound information is taken from the Left/Right stereo signals on tapes, CD's, laser disks and television broadcasts. A surround-sound processer provides L+R and L-R signals at appropriate levels to appropriate speakers.

10. L-R is the ambient signal, which helps provide a three dimensional audio experience.

Exercises
1. B. receiver
2. E. no control can boost bass
3. C. AUX, source
4. A. integrated amplifier
5. C. tape recording cannot be monitored almost instantly after the recording
6. D. a receiver
7. C. pre-amplifier
8. E. no, because an integrated amp is needed
9. B. a total faithfulness to the original sound
10. C. sound at one end of the room can be different from that at the other end
11. A. nothing will happen because the volume control is after the TAPE OUT jack
12. B. both channels will sound quieter
13. B. auxiliary input
14. D. 30 Watts, which is between 1/4 and 1/2 of 100 Watts
15. C is L+R
16. D is L-R
17. G is L-R
18. B. tape deck - pre-amp - power amp - speakers
19. A. tape monitor switch was in IN position
20. E. none of the above
21. D. TAPE OUT jack
22. B. AUX input
23. A. it does not have enough power
24. E. all of the above are correct
25. C. four or five speakers producing different sound intensities at different times

back to Syllabus