Question about Coby CV-190 Consumer Headphones

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CV-191 I will suggest to anyone interested in buying Coby headphones to stay away from them. They are JUNK! So far, I have snapped the earcups of of two sets CV-191 headphones and after I complained to Coby about how poorly built their phones were, they sent me a new set of CV-192 headphones at N/C. Yesterday the headband snapped on the 192's. I can't complain about the sound (it's actually pretty good), but they are very very poorly built, like most products coming from China. Spend a little bit more money and get something better if you to want to use the phones for more than a few months. If you're looking for disposable headphones, Coby products are perfect.

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1 Answer

There is a buzzing sound in the left earcup, without any audio cord plugged in. It occurs when I turn the headphones on, and it sounds like a very high pitched screech. Any ideas?


Make and Model information of the head set would help.

As for an idea it would be power line hum being picked up by the audio cord. I am assuming this because you turn it on and I then assumed it has ab internal amplifier. Short all three pins together and the buzzing should go away unless there is a broken ground wire.

May 20, 2014 | Audio Players & Recorders

1 Answer

Phones get a peersing screach; itgets louder when you press the side where the on/off switch is


The design of these headphones includes a microphone on the outside and on the inside of each earcup. The outside microphone detects outside noise. The inside microphone monitors what you are hearing and when it detects that the outside noise is present inside, the active noise-canceling circuits remove that noise. This happens fast enough that you perceive a significant reduction in the outside noise getting to your ears.

The airspace inside the earcup is a tuned chamber defined by the foam in the ear cushion. This is important because with the inside microphone in close proximity, but at a 90-degree angle to the speaker, the circuit must be designed to eliminate the normal feedback that occurs. When you press the earcup close to your ear, you are changing the size and shape of the air chamber inside of the earcup thus directing more of the speaker sound toward the microphone than the design can compensate for causing audio feedback to occur. You are hearing that feedback. Removing your hand from the earcup should restore the shape of the air chamber allowing the circuits to return to normal operation.

If the feedback occurs too easily when you are NOT pressing on the earcup, then the foam may have weakened/deteriorated and it may be time to replace the ear cushion.

On my QC-3 headphones, I can cause the feedback squeal in both earcups, with the left earcup being more sensitive to the shape change than the right.

Dec 01, 2013 | Bose QuietComfort 3 Acoustic Noise...

2 Answers

Left Ear cup not working.


Either ship them back to manufacturer if still under waranty or you'll have to re-solder the wiring to that speaker if they have become disconnected or yanked accidentally of which the leftside is usually where the headphone cable first enters in the left side.

Oct 10, 2013 | Audio Technica ATH-ANC27 Headphones

1 Answer

Severe squelch in left ear phone


The design of these headphones includes a microphone on the outside and on the inside of each earcup. The outside microphone detects outside noise. The inside microphone monitors what you are hearing and when it detects that the outside noise is present inside, the active noise-canceling circuits remove that noise. This happens fast enough that you perceive a significant reduction in the outside noise getting to your ears.

The airspace inside the earcup is a tuned chamber defined by the shape of the foam in the ear cushion. This is important because with the inside microphone in close proximity, but at a 90-degree angle to the speaker, the circuit must be designed to eliminate the normal feedback that occurs.

If the foam in the ear cushion has weakened/deteriorated to the point that it no longer has it's original shape, (in particular the lower half of the ear cushion), the size and shape of the air chamber inside of the earcup is directing more of the speaker sound toward the microphone than the design can compensate for causing audio feedback to occur. You are hearing that feedback.

On my QC-3 headphones, I can cause the feedback squeal in both earcups, with the left earcup being more sensitive to the shape change than the right.

It is probably time to replace the ear cushions. If so, they are available from Bose for $35/pair.

QuietComfort 3 Acoustic Noise Cancelling Headphones Bose Product Support

They are also available aftermarket at Amazon.com for $16.99/pair
Replacement Earpad ear pad Cushions For Bose QuietComfort 3 QC3 Headphones...

or $5.69/pair.
Bluecell Pair of Replacement Earpad Ear Pad Cushion for Bose Quietcomfort...

Aug 29, 2013 | Bose QuietComfort 3 Acoustic Noise...

1 Answer

How to replace ear cushion on bose QC 3 headphone


The ear cushions are held on the earcup with six snap fasteners, three on each side. To remove the ear cushion, simply pull it away from the earcup carefully so that you do not break the plastic snap tabs.

It should not be necessary to pry the ear cushion off with a sharp object, but if you do, be careful. There is also a thin gasket seal between the earcup and the ear cushion, take care not to damage it.

If you need to replace the ear cushions with new ones, they are available from Bose for $35/pair.

QuietComfort 3 Acoustic Noise Cancelling Headphones Bose Product Support

They are also available aftermarket at Amazon.com for $16.99/pair
Replacement Earpad ear pad Cushions For Bose QuietComfort 3 QC3 Headphones...

or $5.69/pair.
Bluecell Pair of Replacement Earpad Ear Pad Cushion for Bose Quietcomfort...

Apr 02, 2013 | Bose QuietComfort 3 Acoustic Noise...

1 Answer

Hi, when I press the left eatcup close to my ear, there is this very loud high pitch noise that comes from it and is unbareable. I have to removed them inmediately. What can I do, and what those this...


The design of these headphones includes a microphone on the outside and on the inside of each earcup. The outside microphone detects outside noise. The inside microphone monitors what you are hearing and when it detects that the outside noise is present inside, the active noise-canceling circuits remove that noise. This happens fast enough that you perceive a siginficant reduction in the outside noise getting to your ears.

The airspace inside the earcup is a tuned chamber defined by the foam in the ear cushion. This is important because with the inside microphone in close proximity, but at a 90-degree angle to the speaker, the circuit must be designed to eliminate the normal feedback that occurs. When you press the earcup close to your ear, you are changing the size and shape of the air chamber inside of the earcup thus directing more of the speaker sound toward the microphone than the design can compensate for causing audio feedback to occur. You are hearing that feedback. Removing your hand from the earcup should restore the shape of the air chamber allowing the circuits to return to normal operation.

If the feedback occurs too easily when you are NOT pressing on the earcup, then the foam may have weakened/deteriorated and it may be time to replace the ear cushion.

On my QC-3 headphones, I can cause the feedback squeal in both earcups, with the left earcup being more sensitive to the shape change than the right.

Aug 13, 2011 | Bose QuietComfort 3 Acoustic Noise...

1 Answer

I have had my headsets for 3 years, they work well, I have just noticed that the left ear pad is detaching from the base. How do I get fixed?


The ear cushions are attached to the earcup with plastic tabs that snap into the plastic in the earcup. The lower snaps may be unfastened. Try pressing the ear cushion firmly to the earcup around the lower edge to refasten the snaps. Do not press in the middle of the ear cushion - you may damage the internal microphone.

If this fails, you will need to remove the ear cushion by pulling it off the earcup and inspect for broken plastic where the tabs are on the ear cushion or where the tabs attach to the earcup. If a tab is broken on the earcup, replacement earcups are available from Bose for $35 per pair.

http://www.bose.com/controller?url=/shop_online/headphones/noise_cancelling_headphones/accessories/qc3_earcushionkit_acc.jsp

If the plastic in the earcup is broken, you can try to repair it or you can contact Bose about getting it repaired or replaced.

Jun 11, 2011 | Bose QuietComfort 3 Acoustic Noise...

2 Answers

Hello, I just got a Bose QC3 on eBay. It works fine except the cable which is not the original one but a one from T'nB and the left earpiece has a very annoying whistling noise when I press it or even...


i would buy a new ear cup.and a new battery. and perhaps a new cord.
i had a problem w/ my ear cups and i noticed that when i bought the new ear cups the sound was better.
i also read that if the battery got alot of usage (4 plus year) then the whistling noise comes from that. i'm starting to have the same problem. i have had my headphones for a long time. i think like anything else that operates on batteries its time to change it.

Mar 06, 2011 | Bose QuietComfort 3 Acoustic Noise...

1 Answer

My old KOSS TD/60 Stereophones have a broken cable right near the earphone entry point. How can I open the earphone to repair or replace the cable?


I figured that that the earphones were pretty old, so if my 'repair' didn't work I would just replace them with new ones. There is a groove filled with acoustic foam that runs right around each earcup that terminates at the cord's entry point. After removing the headband yoke by carefully popping it out of each earcup I simply gripped both sides of the earcup and applied outward pressure until the front and back halves separated. Fortunately they are held together by plastic clips that snap apart. Once I had located the fault in the cable and repaired it the earcup halves easily snapped back into place. I now have a functioning set of headphones again!

Apr 22, 2008 | Audio Players & Recorders

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