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Mainly your audio jack is damage (u insert ur headset or loopset in ur cell, and ur cell doesn't detect anyone of them than ur headset or audio jack is damaged.)
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Feedback is a sharp, loud noise that can come through the earphones of a headset unexpectedly---it occurs when the headset is getting sound (feed) from someone else speaking or playing music into a microphone. This sound can create a dangerous situation for someone who is operating expensive equipment or flying a plane at the time since it can disable hearing temporarily. If you experience feedback often, it could also lead to serious hearing problems.
Mic Too Close to the Speaker or Volume Too High The main cause of a feedback sound in a headset is proximity to a speaker. If a person holding a microphone on the other end gets too close to a speaker, it creates a loop of re-amplified sound that results in the loud, screeching noise. When the volume on the other party's microphone is too high, it is more vulnerable to picking up unwanted noise and feedback from speakers and sound output devices in the room. So make sure that you ask the other party to turn down the microphone to a normal level and stay far from speakers. b> Two Microphones Gathering Same Sound b> When the other party places two microphones too close to each other, it could cause feedback. When positioned toward the sound source (such as a person speaking) the microphones will both pick up the same audio and compete with each other when creating the output of sound, causing a sharp noise in your headset. This problem, called acoustic phase interference, is resolved by simply ensuring that the other party uses one microphone at a time. Poor-Quality Headset or Microphone b> One common cause of feedback is simply a poor-quality headset or microphone. Most modern headsets and microphones have noise-canceling features that manage and kill feedback before it has a chance to occur. These noise-canceling headsets are essential for pilots and aviation crew members. If you hear sudden feedback that is strong enough to hurt your ears, the headset or microphone is simply not properly equipped to actively cancel that unwanted noise before it hits your ears. Buy a higher-quality noise-canceling headset to manage the feedback noise when you're going about your tasks. Hope this helps.
Is it the unwanted sound produced from small speaker (earpiece)? If the sound comes like itching the ear it means the diaphragm of the small speaker is broken.So during this warranty time better to tell the NOKIA CARE.Good luck
you have 2 speakers. 1 ear speaker for calls and 2nd one for ringer, MP3, loudspeaker etc. Make sure your ear speaker volume is all the way up, nothing in the way ( dirt - make up - metal shavings etc ). If all is good have your ear speaker replaced.
On the CS55 headset itself, right below the speaker that sits on the ear is a cover that can be removed. Inside is a small special battery. The battery life tends to last about 3 years, and at that you should be getting 8 - 10 hours of talk time. Once it's decreased to about 4 hours of talk time in a day, it's about time to replace the battery.
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