Feel free to ask questions. I'll do my best to answer.

Friday, August 26, 2011

Large Driver Cone Treatement

the Eminence Delta ProA.

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

into this:

and this:

into this:

Time elapse on these showed similar results, but I didn't save the graphs or the drivers.


  1. Good stuff, Dan! I really like the results.
    Anything 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

  2. Thanks Mark.

    Efficiency 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,