Yes, their response graph is optimistic.
Prior to any treatment, the one's polar response looked like this:
I didn't do the other one out of sheer laziness.
After one round of stiffening and surround damping treatment I got these:
after the next round those went to these respectively:
another round makes
this:
into this:
and this:
into this:
Time elapse on these showed similar results, but I didn't save the graphs or the drivers.
Good stuff, Dan! I really like the results.
ReplyDeleteAnything that knocks down the breakup and improves polars for just a little time pocket change is a BIG deal!
Subjectively, is the loss in midbass sensitivity noticeable? (Obviously, "rated" sensitivity will take a hit when the breakup is removed - perfectly okay if Hi-fidelity is the goal).
Just to clarify: You just stiffened the cone, and damped only the surround, correct?
Also, have you experimented with treating both sides of cone and surround, or front only?
-- Tubamark
Thanks Mark.
ReplyDeleteEfficiency loss didn't seem to hurt and was minimal. Maybe for pro audio duty it wouldn't be desirable, but for home I couldn't see a problem. The little drivers took a much bigger hit in efficiency than these did.
Yea, I just stiffened the cone and damped the surround on these. On the surround I only damped the front b/c of difficulties of getting to the back side. On the cone stiffening I did both front and back.
Hope that helps,
Dan