Headphone Testing Lecture Notes

Introduction

• Purpose: To test the capabilities of headphones.

Bass Extension Test

• Frequency Range: 200 Hz to 10 Hz.
• Good headphones: reproduce frequencies as low as 20 Hz (lowest limit of human hearing).
• Test involves listening to music to gauge how low the headphones can go.

Treble Extension Test

• Frequency Limit: Good headphones should reproduce up to 20,000 Hz (upper limit of human hearing).
• Poor quality headphones may rattle at high volume with deep bass content.

Bass Frequencies Test

• Objective: Scan bass frequencies which will shake the drivers.
• Recommendation: Adjust the volume to ensure the sweeping tone remains clear and pure without buzzing.

Driver Frequency Response

• Better headphones have tighter tolerances in driver frequency response.
• Importance of Stereo Imaging: Left and right drivers must respond equally across frequency spectrum.
• Central Positioning: The sweeping tone should appear to be in the middle of the listener's head without deviation.

Binaural Recordings

• Definition: Recordings made by placing microphones in one’s ears.
• Playback through headphones ensures both ears receive the exact signals captured.
• Proper Wiring: Left channel must go to the left ear and right channel to the right ear.
• Relative Polarity: Both drivers should move in the same direction when presented with the same input signal.

Hearing Test

• Participants are encouraged to note the frequency at which they start hearing the sound.
• Interaction: Viewers are invited to share their scores.

Conclusion

• Engagement: Viewers are encouraged to like, share, and subscribe for more content.