Was playing around with some DE250s where one of them was showing some unusual traits. I could hear some buzzing from the suspect driver and when I pulled the rear cover, the foam strip used to dampen the chamber was loose and bouncing around on the diaphragm.
This got me thinking. Would this driver benefit from better dampening of the rear chamber?
What I did was tack in 2 layers of sheeps wool felt into the chamber, keeping the center away from the diaphragm. I used a few drops of fabric adhesive to secure the felt. Be aware not to use too much adhesive. You just need enough to keep the felt in place and away from the diaphragm.
Impedance measurements show some improvement all around, with most of the differenc being audible in the higher treble. The top end sounds quite a bit cleaner to my ears. Without the felt, the HF was less defined and more veiled. I may update this thread later on with some FR measurements. Hopefully this is helpful to a few of you for now.
First measurement is without felt and the second one is with 2 layers added.
This got me thinking. Would this driver benefit from better dampening of the rear chamber?
What I did was tack in 2 layers of sheeps wool felt into the chamber, keeping the center away from the diaphragm. I used a few drops of fabric adhesive to secure the felt. Be aware not to use too much adhesive. You just need enough to keep the felt in place and away from the diaphragm.
Impedance measurements show some improvement all around, with most of the differenc being audible in the higher treble. The top end sounds quite a bit cleaner to my ears. Without the felt, the HF was less defined and more veiled. I may update this thread later on with some FR measurements. Hopefully this is helpful to a few of you for now.
First measurement is without felt and the second one is with 2 layers added.
