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Old 10th November 2011, 09:06 PM   #51
fperra is offline fperra  United States
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Quote:
Originally Posted by geraldfryjr View Post
One thing that comes to mind is that on the data sheet the voltage range is specified as 6.4kv to 7kv.
A 600v difference,what guarantees the consistency between two units for one per panel?
jer
They are rated as 113V to 132V input for an output of 6KV to 7.4KV. Where I live the voltage runs pretty steady at 120V so I would guess these modules will provide about 6.4KV output. I think this will work with a.125" spacing. When I first power up the panels I'll use a variac and see how it goes. At the first sign of sizzle, I'll back off.

Last edited by fperra; 10th November 2011 at 09:15 PM.
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Old 10th November 2011, 10:21 PM   #52
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If you do stress check on the panels with that supply after they are coated and get no arcs I don't foresee any issues with such a large D/S.

I used to run My little panels up into that range with a D/S of about .075".
But the coating is also thick enough to with stand those kinds of voltages.

Normaly in free air using sharp points it would jump a 6mm gap.

In a few days I will have my panels back running (again after a year) now that I have the power supply almost finished.

I will be back to square one with one of them.

One of the screen stators got ripped from something ( a speaker box fell on it from way up high ).
I will have to repair it and reseal it in order to get it back to that level of voltage again.

I am patient ,But I can't wait because this will be the first time that I will be listening to them in stereo again since 2003 when I first made them.

All of the tests I made last year were done in mono, Because a was observing the nuances of each individual panel and configurations that I was trying out.

Running them in stereo would have distracted me from the things that I was trying to find.
Even in mono they were incredible no mater what configuration and how many panels I used.

jer
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Old 12th November 2011, 04:22 AM   #53
fperra is offline fperra  United States
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I wonder if anyone on the forum has used one of these amps:
BEHRINGER: NU3000DSP

It's a new amp from Behringer that has a built in DSP with x-over and a lot of other features. I'm thinking of using a pair to drive my speakers when they are done. The xlr inputs don't bother me since that is what I'm using anyways with my Denon AVP-A1HDCI preamp.
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Old 12th November 2011, 02:06 PM   #54
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Have not used any Behringer amps but a pro guy whom I respect says they are not money well spent. Perhaps you should check out the pro sites for comments on reliability. Hope this helps best regards Moray James.
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Old 15th November 2011, 06:13 PM   #55
fperra is offline fperra  United States
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I have a bunch of 125 Mohm 5 watt metal film resistors that I bought many years ago. I would like to use these for the HV bias resistors. Would these work, or are they too high?
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Old 15th November 2011, 06:37 PM   #56
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The value that you have is ok as an example the stock Acoustat load resistor is 500M. You may find that your resistors are not suited to HT applications so try them and see how they hold up. Best ergards Moray James.
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Old 15th November 2011, 06:40 PM   #57
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Quote:
Originally Posted by fperra View Post
I have a bunch of 125 Mohm 5 watt metal film resistors that I bought many years ago. I would like to use these for the HV bias resistors. Would these work, or are they too high?
125Mohm will work just fine.
In practice, anything between 10Mohm - 500Mohm will do.
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Old 15th November 2011, 06:51 PM   #58
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I have used common 1/4 watt 10megohm resistors from radio shack to feed my panels from the bias supply with no problem.

The only time I lost one was from arcing to a ground wire when I was testing the supply and the ground wire was to close to the resistor body and the arc punctured the protective casing and burned it,that was the only failure so far.

jer
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Old 30th November 2011, 02:17 AM   #59
fperra is offline fperra  United States
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My design is going to be two woofer panels per side with radiating areas of 60" by 8.5" using .5 mil mylar and .125 DS spacing. The mid, highs will come from one panel per side with a radiating area of 60" by 3.5" using .25 mil mylar and .0625 DS spacing. Bias for the woofers will be in the order of 5000 to 7000 volts. The mid/tweeter will be biased at 2500 to 3500 volts. Woofers will use two Oil burner transformers per side and mid/tweeters will use two to four toroids per side.

If I can get the oil burner transformers to work up to about 400 Hz, do you think the radiating area of the mid/tweeter will produce enough output to cover the rest of the spectrum?
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Old 30th November 2011, 11:47 AM   #60
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Yes,that sounds like a good combination.
That is pretty much what I had in mind of doing at one time.

I ran my 3.25' wide panel at about 5.5Kv to 6.5Kv with with a very high transformation ratio (200 to 400 :1) and a big amp (crown DC300a) it is was louder than any woofer system I had at the time.
And,Louder than I could stand in this room and that was for one panel.

I will be getting it running very soon and I can't wait to put it up against the woofer system I now have.

And then I will start on the longer versions of the same panel.

Here are some in room response charts.
jer
Attached Images
File Type: png subwoofer corner floor.png (27.7 KB, 129 views)
File Type: png RIGHT STACK.png (25.1 KB, 126 views)
File Type: png NO MIDS TEST3 1-5.png (24.4 KB, 124 views)

Last edited by geraldfryjr; 30th November 2011 at 12:17 PM.
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