The diagram above is typical of a small sound system that could be found in a home, club or pub.
On the left are three (or more) signal sources.
Next come preamplifiers to increase the signal level, sufficient for the mixer.
The mixer has independent volume controls for each signal source. It might also have bass and treble controls to improve the sound balance.
The mixer output is too small to drive loudspeakers so a power amplifier is used to increase the signal to a suitable level.
A radio, TV or recording studio would consist of a more complex version of this diagram. There would be at least two channels for stereo and perhaps many more for multi-track recording.
Last Name Class ID
Q: qNum of last_q
Q ID: Question ID
Score: num correct/num attempts
- You can attempt a question as many times as you like.
- If you are logged in, your first attempt, each day, is logged.
- To improve your scores, come back on future days, log in and re-do the questions that caused you problems.
- If you are logged in, your most recent wrong answers get remembered. This might help you and your teacher to correct your understanding.
- In the grade book, you can delete your answers for a topic before re-doing the questions. Avoid deleting unless you intend re-doing the questions very soon.