Hey guys, just thought I might share a mod I did recently with interesting results.....I have a pair of 12" Celestion 70/80 drivers and they are remarkably clear and articulate , but I found a little abrasive and honky in the 2.5 - 4k region.
I put Dynamat Extreme around the speaker frame (the frame is a pressed steel cheapie) and also on the back of the magnet, leaving a hole for heat dissipation for the voice coil.
All I can say I wow! The sound is even clearer, faster and all the harshness/honky is gone. I did notice quite a bit of bass (lower mids) was missing when I was standing back a bit (driver isn't in a box yet), so I went up to the driver to listen and realized that all the bass was still there, it was just all at the rear of the speaker, projecting perpendicular (out the sides) of the speaker! Quite interesting...
I have no doubt that if you put it in a box the lower mids would be projected forward again!
Anyway thought some people here might benefit from this for their own project or experimentation.
Image attached.
IMG_3175_A.jpg
Cheers.