Acoustat panel angles? 8" vs 9" panels? - Page 2

geraldfryjr · 14th April 2010, 06:27 PM

Thank you for sharing with me your veiws.
That seems to be the norm so far on direct drive amps.
I plan on going that route some time in the near future.
I'm just trying to find out how much peak to peak drive voltage will be required to achieve above average performance. jer

hella356 · 15th April 2010, 05:15 PM

I don't know the answer to the drive voltage question. I do have a copy of the servo amp manual but I'm not sure if that will suffice.

geraldfryjr · 15th April 2010, 05:18 PM

That would be great!
Any info is a good thing. jer

hella356 · 15th April 2010, 07:46 PM

jer, you've been PM'ed.

bear · 15th April 2010, 08:25 PM

equal to the bias voltage is ur max... minus breakdown issues.

geraldfryjr · 17th April 2010, 05:07 AM

Thanks again ,hella 356,for the literature.
Lots of super info.
I have already read all 995 pages.
Looked at(ha ha ha )!
The acoustat-x info was what I was looking for,and, it is all there,cool!
It's know wonder you studdered when I asked you how big are the transformers.
They'er fricken huge,correct me if I'm wrong but I thought I read 14"x8"x4".
Nice size for a fullranger. jer

hella356 · 24th April 2010, 06:07 PM

Until I can get over to my cabinetmaker friend's place to get really crazy with some adjustable frames, I slapped together a 3+1 setup using the 3 panel pod from the X, with some extra 9" panels mounted above. The lower panels are now perpendicular to the floor rather than tilted back as they were in the X. MUCH better than the X with 1+1 standing next to it. I haven't played with placement much yet, but I think I'm on the right track and have essentially solved my wanting the "best of both worlds" for now, although I am certain there will be substantial gains to be had when my buddy puts together some better thought-out and executed frames.

geraldfryjr · 25th April 2010, 06:18 AM

Looks very cool! jer

geraldfryjr · 29th April 2010, 02:17 AM

hella356,How do you have your panels wired together?
I find that when I Paralleled my three little panels together I seem to be getting charge migration between them at different bias level settings.
It's like having a pan control when I adjust the bias control.
Because of this it also has an effect on directionality of the three combined panels.
I think I have stopped this by putting a seperate 30megohm resistor on each diagphram connection before connecting to the bias supply.
Each panel is a little different but not by much and I didn't think that there would be any issues like this.
I'm very curious? jer

hella356 · 29th April 2010, 04:39 AM

They are all wired together into a three prong banana plug which plugs directly into the Acoustat direct drive amp. When used with the transformer interfaces, they all are connected to single spade lugs for front & rear stators, with a pin connector for the panels. So yes, they are all connected in parallel. This is the way all non-Spectra Acoustats are set up, and - I'm quite sure - the Spectras (even with their more complex wiring) are also run this way.

15th April 2010, 08:25 PM	#15
bear expert in tautology diyAudio Member Join Date: Apr 2002 Location: New York State USA	equal to the bias voltage is ur max... minus breakdown issues. __________________ _-_-bear http://www.bearlabs.com [...2SJ74 Toshiba bogus asian parts - beware! ] -- Btw, I don't actually know anything, FYI --

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14th April 2010, 06:27 PM	#11
geraldfryjr diyAudio Member Join Date: Feb 2008 Location: Jackson,michigan	Thank you for sharing with me your veiws. That seems to be the norm so far on direct drive amps. I plan on going that route some time in the near future. I'm just trying to find out how much peak to peak drive voltage will be required to achieve above average performance. jer

15th April 2010, 05:15 PM	#12
hella356 diyAudio Member Join Date: Feb 2009	I don't know the answer to the drive voltage question. I do have a copy of the servo amp manual but I'm not sure if that will suffice.

15th April 2010, 05:18 PM	#13
geraldfryjr diyAudio Member Join Date: Feb 2008 Location: Jackson,michigan	That would be great! Any info is a good thing. jer

15th April 2010, 07:46 PM	#14
hella356 diyAudio Member Join Date: Feb 2009	jer, you've been PM'ed.

17th April 2010, 05:07 AM	#16
geraldfryjr diyAudio Member Join Date: Feb 2008 Location: Jackson,michigan	Thanks again ,hella 356,for the literature. Lots of super info. I have already read all 995 pages. Looked at(ha ha ha )! The acoustat-x info was what I was looking for,and, it is all there,cool! It's know wonder you studdered when I asked you how big are the transformers. They'er fricken huge,correct me if I'm wrong but I thought I read 14"x8"x4". Nice size for a fullranger. jer

25th April 2010, 06:18 AM	#18
geraldfryjr diyAudio Member Join Date: Feb 2008 Location: Jackson,michigan	Looks very cool! jer

29th April 2010, 02:17 AM	#19
geraldfryjr diyAudio Member Join Date: Feb 2008 Location: Jackson,michigan	hella356,How do you have your panels wired together? I find that when I Paralleled my three little panels together I seem to be getting charge migration between them at different bias level settings. It's like having a pan control when I adjust the bias control. Because of this it also has an effect on directionality of the three combined panels. I think I have stopped this by putting a seperate 30megohm resistor on each diagphram connection before connecting to the bias supply. Each panel is a little different but not by much and I didn't think that there would be any issues like this. I'm very curious? jer

29th April 2010, 04:39 AM	#20
hella356 diyAudio Member Join Date: Feb 2009	They are all wired together into a three prong banana plug which plugs directly into the Acoustat direct drive amp. When used with the transformer interfaces, they all are connected to single spade lugs for front & rear stators, with a pin connector for the panels. So yes, they are all connected in parallel. This is the way all non-Spectra Acoustats are set up, and - I'm quite sure - the Spectras (even with their more complex wiring) are also run this way.