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: Trying to do it with less blood.Posted by Romy the Cat on: 6/3/2013

Paul, Alinco magnets perfectly able to drop a charge "just like that" and I presume that it is what happened. If cause the environmental difficulties would not do it alone, at least for that time. Over winter I had output tubes worn up on both amps and as 6C33C begin to die they did the “pinging”. The pinging is outburst of energy that mostly likely near DC signal and DC discharges Alinco very aggressively. Saying that, I’ve been observing this behavior of 6C33C for years I need to say that I did not see that impact the pinging had to drivers. However in my past the drivers were MF driver and I never had Alinco on bass. So, it very much might be that my drivers got demagnetized. I can’t to be sure however and I can stick as now my gaussmeter to anywhere and I do not know how a discharged Vitavox sound. It feels like the long decay from discharged driver but I it is mostly because I have no other explanation and because I did observed somewhat similar effect with other driver, not bass drives, however.

Jessie, to re-magnetize the drivers is very simple, in my case the key would be to do it in place as to remove driver from attic is pain in ass. I would need to figure out the polarity, wind some 1-2GA wires around the magnets and lead those wires outside the back chamber. Then get some 3-4 Farad, high discharge current capacitors bank and run the capacitors through the wires with some kind SS or mechanical switch. There are no needs to remove any membranes; all you need to do is to disconnect VC to make sure that any inductive current would not have room to flow.

For sure it is perfectly doable but that itself would be a big project, not to mention that I am sure that the re-magnetizing has some own kinks about which I am not informed and that takes time to learn. So if I chose to do so then I would need some kind of objective evidence that the de-magnetizing allegations are correct. I do not have that evidence as now. A friend sent me email suggesting that it could it be just that the decay time for the room has changed for a frequency range. It is possible but why it did it with upper knee of my midbass horn but did not affected anything in lower knee of upperbass horn?

Well, there is another option - try to find another non- Alinco driver, let say ceramic or Neodymium that would be more or less immune to de-magnetizing. Well, this is whole different subject as to addition of those driver is figure out how they would behave in my horn would take literally half-life.

The Cat

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