GoodSoundClub - Romy the Cat's Audio Site

In the Forum: Horn-Loaded Speakers
In the Thread: Macondo’s Midbass Project – the grown up time.

Post Subject: Simulated suspension evolutionPosted by jessie.dazzle on: 6/2/2013

Give yourself time and let your unconscious work on it; you might have overlooked a cause originating in the electronics.

Romy wrote: "...The softening of the suspension and even paper would not be responsible for it as not primary resonance slid away but HF extension..."

I seem to remember that you fitted "new old stock" AK drivers... It's totally counter-intuitive but is it possible that the suspension has become stiffer with time? No, but is there something else that might simulate such a condition? Yes... A stiffening of the back chamber foam as Paul suggested... If that were the case, assuming you used the same foam in both these and your upper-bass horns, then logically you would have a similar issue with the smaller, older horns. If so, it may not be audible in the smaller horns or may have resulted in an improvement.

If this is what's happening with your mid-bass horns, you may be able to correct the issue by increasing rear chamber volume (digging out some foam).

Perhaps I needed to put the magnet charging wire in the back chamber and recharge them right there in attic?

Are you imagining wrapping the magnets with coils?
I was told by a guy who offered to remagnetize mine via a large remagnetizing "apparatus", that it is quite a violent process and requires removal of the membranes to prevent their destruction. I have not yet done it. I assume what you are proposing is a more gradual charge.

jd*

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