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The headband post can only be inserted into the earpiece when the earpiece has been sufficiently rotated. (Note that the hole and post are a 'D' shape, not round.) The installed ear cushion is preventing you from rotating the earpiece sufficiently.

Remove the ear cushion from the earpiece by carefully pulling it off so you do not damage the clips that hold it on or the gasket material between the cushion and the earpiece. There are six clips, three on each side.

Now you can rotate the earpiece into the position where the headband post can be inserted into the earpiece. Carefully reinstall the ear cushion by pressing it onto the plastic clips. Note that it can only be installed one way with the internal plastic support towards the headband.

Oct 01, 2013 . 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. They are also available aftermarket at Amazon.com for $16.99/pair or $5.69/pair. Aug 29, 2013 .

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. They are also available aftermarket at Amazon.com for $16.99/pair or $5.69/pair.

Download groove theory groove theory zip. Apr 02, 2013 . Please follow the proper instructions below Ear cushion reattachment If the ear cushions come off your headphones, reattach them as follows: 1. Fit the mounting flange inside the rim of the ear cup.

Make sure it attaches smoothly and uniformly within the entire ear cup. (Do not remove the ear cup lining material).

Ear cushions may need to be replaced due to normal wear and tear. To order replacement ear cushions, call 1-888-865-2700. Hope you are satisfied with my solution.Your valuable feedback would be appreciated.Thanks for choosing Fixya. TinuAlbinAlex Jun 15, 2011 . 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.

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This happens fast enough that you perceive a siginficant reduction in the outside noise getting to your ears. The airspace inside the lower half of 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 the foam has weakened or deteriorated to the point that the size and shape of the chamber cannot be maintained, more of the speaker sound is directed toward the microphone than the design can compensate for causing audio feedback to occur. This also happens when the lower half of the ear cushion is compressed. Since this is occuring during normal use, it may be time to replace the ear cushions. They are available from Bose for $35 per pair. Sep 18, 2009 .