My Re-foamed Speaker Has Failed Test?
It could be that the foam surround is not central, or the foam is too stiff or soft?
Here is an example of what could happen after repairing your speaker. This is where the newly replaced foam is too tight, or misaligned.
- Loud volume good.
- Ordinary speech good.
- Quiet speech was slightly muffled?
I suspected that the new foam surround was restricting the speaker in some way, but only slightly due to the fault being at low volume. The only way to confirm this was to release the new foam repair from the outer edge of the speaker and try again.
With the speaker replaced in the cabinet (and failed test), I carefully released the outer edge of the replacement foam from the speaker frame. (There is a danger that the new foam will become damaged by the process, so be careful).
With the speaker foam surround released, play some quiet, gentle sounds and observe the speaker to see how it performs. I.e. It moves freely without any obstruction.
As the speaker cone moved freely, I then glued a small section of the speaker foam surround (on opposite sides, so its balanced) whilst the speaker was still operating (using music that was soft and gentle on the speaker). A flexible impact adhesive (or grab adhesive) was used because the speaker was still operating and needed a relatively fast gluing method. Whilst this was being carried out, I listened to the speaker and observed its performance.
Satisfied that the speaker was still performing OK, with only a small part of the speaker foam surround attached, I continued gluing the rest of the foam in place (on opposite quarters to maintain balance). All the while still listening and monitoring the sound of the speaker.