The test of true and false friends is that the scorpion is marathon!

**Home Theater Network HDAV.com.cn** With the growing popularity of home theater systems, more and more people are discovering the magic of high-quality sound. Whether it's enjoying a beautiful piece of music or watching an exciting movie, the right audio setup can create a truly immersive experience. But how much do you really know about sound? Today, we’ve prepared a set of questions to test your knowledge on speaker principles and audio technology. Can you score well? Let’s find out! And remember, understanding these concepts can help you avoid common mistakes and get the best performance from your system. --- **Speaker Principle Technology 2017 Exam Questions (Total: 100 points)** **Part I: Fill in the Blanks (20 points)** 1. High-frequency, mid-frequency, and low-frequency speakers are installed in a speaker enclosure, and signals are assigned to each unit using a ______. 2. When the microphone is far from the mixer, the signal should be transmitted in ______ mode. 3. In standard audio connectors, the one that defines the direction of the signal flow is the ______. 4. A sound pressure level of 35 dB at 1000 Hz corresponds to a loudness level of ______. 5. In an indoor sound field, the ______ component is responsible for determining the azimuth position of the sound source. 6. If the low-frequency response of a microphone is too strong and affects clarity, use the ______ knob on the mixer channel to compensate. 7. The type of microphone that requires phantom power is the ______ microphone. 8. To increase the total output power by four times that of a single amplifier, two identical power amplifiers can be connected in a ______ circuit. 9. Humans rely on binaural positioning for horizontal sound localization, where the treble component depends on the ______ between the ears. 10. In a sound system, a ______ is used to protect the power amplifier or speaker from damage due to excessive signal levels. --- **Part II: Multiple Choice (20 points)** 1. The minimum sound level that a normal human ear can hear is: A. 0 dB B. 1 dB C. 60 dB D. -20 dB 2. To reduce room reverberation, which equipment is most effective? A. Equalizer B. Feedback suppressor C. Compressor D. Effect processor 3. Which protection mode ensures that sound reinforcement isn’t interrupted when a circuit breaker activates? A. Load cut-off B. Signal cut-off C. Split-type D. Power cut-off 4. In a rectangular room, what is the ideal height-to-width ratio to prevent resonance? A. 1:1:1 B. 1:2:3 C. 1:1.4:1.8 D. 1:2:2.6 5. When the volume on a mixer is roughly the same across channels, which adjustment should be aligned? A. Gain B. Panning C. Fader D. Balance 6. Which parameter has no effect on the size of a digital audio file? A. Bit depth B. Volume level C. Sampling rate D. Number of channels 7. Placing a speaker in a sealed box is primarily done to: A. Improve directivity B. Enhance bass response C. Increase power output D. Protect the driver 8. If noise energy is fixed, which noise has the greatest impact near 2000 Hz? A. 1000 Hz narrowband noise B. Pink noise C. White noise D. 3000 Hz narrowband noise 9. The ability to distinguish useful sounds from background noise in stereo recordings is related to: A. Physiology B. Psychology C. Physics D. Architecture 10. When playing a track at a low volume, if it sounds natural, what happens when the volume increases? A. Midrange becomes louder, bass is stronger B. Bass is loudest, midrange next, treble weakest C. All frequencies increase equally D. Midrange becomes weaker than high and low frequencies --- **Part III: True or False (10 points)** 1. Sound pressure directly reflects the strength of the sound. 2. Tone refers to subjective perception of sound intensity and frequency. 3. Even with constant panning settings, the sound image may shift. 4. Speaker enclosures have no impact on subwoofer performance. 5. A loudness level of 0 dB is audible to normal listeners. 6. Higher quantization bits always improve sound quality. 7. Gain and fader adjustments can be used interchangeably for volume control. 8. Parallel microphones can increase sensitivity. 9. According to the Haas effect, sounds with less than 30 ms delay are indistinguishable. 10. A mono system cannot be considered high-fidelity. --- **Part IV: Short Answer (20 points)** 1. Why does the analog mixer affect treble and bass more significantly when controlling sound image? 2. How does the reverb generated by processing a microphone signal through an effect differ from natural hall reverberation? --- **Part V: Essay (30 points)** 1. What causes a dry or “hard” sound, and how can it be improved? 2. Describe the function of a room equalizer. --- The exam is now over. Please review your answers carefully and check your score. Good luck, and don’t forget to share this quiz with friends who love home theater! For more interesting and up-to-date home theater news, visit **[Home Theater Network](http://www.hdaV.com.cn)** or follow us on **WeChat: cnhifi**. The country’s most influential home theater and audio media platform.

Agriculture Sprayer Drone

Agriculture Sprayer UAV,Agriculture sowing Drone,Agricultural fertilization drone

Jiangsu Yunbo Intelligent Technology Co., Ltd , https://www.fmodel-ai.com