 
|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
|
|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
172.130.223.220
In Reply to: RE: Driving Sound Labs with Atma's posted by throwback on June 15, 2012 at 16:24:07
Thanks for all the info...keep it coming..
I gess we now know were the highs went...the amps must have been runing on just what... 4 of the tubes....these amps are great...not minny amps would even try to work an then would just blow-up...only thing here....it to hot to run the amps.....but just knowing that i have some of the BEST amps ever made by man....it all good.....an i have other things see...
I find that now that i have my ESL runing like i new thay could an should....i feeeeeeeeeeeeel a lot better about most things......goodluck
Edits: 06/16/12Follow Ups:
Thanks, TYU. I just thought about something else. You mentioned the heat. I'm wondering about the effect of altitude on impedance. My house is at 7,000' (Colorado); certainly the air load on the panels must be less. Lew has already theorized that humidity might make a difference (very low here). Small effects, maybe, but stuff adds up.
Just kidding, sorta, but the capacitance of your panels must be marginally lower up there in them mountains. Since the multiplier for the dielectric contant of air is 1.00054 compared to vacuum, the lower the pressure the closer you get to 1. When you get to one you will hear nothing :). I did some calculating and it turns out for the 2350 sqin area and abut 0.15 in panel to stator distance, and having the two sides of the push-pull in series, the resulting capacitance is somewhere between 1500 and 1800 pf. which is very closed to the published value. There is also an interesting side observation that if the panel was not push pull there would be an asymmetric distortion with the displacement of the diaphragm, but the push-pull cancels it out, very clever, never thought of it. looking at the panels at high volumes, they move quite a bit, the capacitance is a linear function of the distance, so moving half a distance closer doubles the capacitance, at the same time the opposite side halves, the series value of course is not constant. I have not calculated forces, but because static force on a charge has a quadratic relationship to distance the push pull is nto entirely linear either. I am sure Dr. West has a precise model of the whole thing just for satisfying ones own curiosity, or hell just listens to the damned thing and ignores the mumbo jumbo.
dee
;-D
True terror is to wake up one morning and discover that your high school class is running the country.
quote by Kurt Vonnegut
Edits: 06/18/12
with your understanding of the physics.
In fact, in a few rare instances there have been reports of problems with ESLs at high altitude. Thanks for reminding me why and that it did not have so much to do with humidity as with the density of the atmosphere at high altitude. I heretofore thought Chuck was near Denver, at about 5000 feet. 7000 feet; that's high. But his speakers do work, thank goodness.
Another force in play is due to the tension on the diaphragm and its elasticity, which will tend to make it want to move back away from the stator, after being displaced by the electrostatic force, in either direction. The whole thing is quite complex.
most of it is just being able to search in google, and the very, fading, basics one learned in EE undergrad :). if i gave you the second harmonic distortion resulting from the tensors stretch forces and the quadratic force of static charges then you could be :), but just thinking about what the panel does in a dynamic environment is not very impressive thinking .
dee
;-D
True terror is to wake up one morning and discover that your high school class is running the country.
quote by Kurt Vonnegut
"the quadratic force of static charges"
I think that's just Coulomb's Law, F = K(Q1*Q2)/r^2, where K is a constant, Q1 and Q2 are the charges on two objects, and r is the distance between them. It's just an analog of the equation for the force of gravity, also called an inverse square law. I remember that from freshman physics at a good liberal arts college. But I am going only on a 45-year-old memory, not Google or Wiki.
Sound Lab is located in Park City, UT. My Google effort tells me that PC is located at 7,000'--approximately the same altitude at which I am operating my speakers.
I agree about the effects of humidity. When I lived in Northern Virginia, there were days I hated listening to my double KLH-9's because of it. They sounded, well, soggy.
I was running them with Futterman-designed 200-watt monos, built (with Julius Futterman's assistance) by Lucius Morris. I wish I still had them. BTW, anyone know whatever happened to Lucius? I have been trying to reconnect with him to no avail.
Back in the early 70s, when I met our mutual friend TL, I owned a double pair of KLH9s, too. AND I owned Lucius' last pair of his home-made Futterman monoblocks, with eight 6LF6s per side. AND I lived in Reston for one of those years and also experienced soggy diaphragms on the odd occasion. I kept up with Lucius for quite a while, but I have not seen or heard from him for at least the last 10 years, probably more. He never gave up on ESLs; he was a major US dealer for Audiostatic, and I once went to his home to listen to their all-out system. But Lucius did give up on tubes and OTLs; he was running the Audiostatics with huge and heavy NRG solid state amps, built in the midwest, now defunct. However, he used to admit to me privately that OTLs were still the ultimate way to go. I have been in and out of KLH9s several times over the 40 years since Reston.
I also had double KLH-9's, TWICE! From 66-70 and from 76-78.
Lucius used to work with Brian Cheney of VMPS, but Brian hasn't heard from him in a long time either. Too bad. A really good guy.
What going on with the SoundLabs ?.....How do sound with the Mod?...have you got the M1 going.?...Love these acoustat 6s...Thanks for your time
Chuck (Throwback) lives in or near Colorado Springs. He used to live in my area. Anyway, he told me privately that his house was in the path of the fire. He and his wife were evacuated, and as of two days ago he did not know whether his house had survived the fire. I would guess that he will know by this weekend. Hold the good thought for Chuck.
He had just been allowed back to visit his house. It was completely intact! A lot of the houses on his block had been burned to the ground....
I hope that his SL speakers suffered no smoke damage. Chuck was fearful that even if his house was intact there would be extensive smoke damage inside. Interestingly, Chuck's daughter had determined via an aerial or satellite photo that the house survived, even before it was confirmed by direct methods. This was last week.
I myself just got power back to my house after 6 days, in near-100 degree or actual 100-degree temperatures. The lack of power was really getting to me. It took about 12 hours for our top floor to become habitable after turning on the AC. Like Tyu said, I wonder what it will take for the naysayers to concede that there is climate change going on. Here we are looking at 3 more days of circa 100-degree high temps. (Truthfully, I am a bit reluctant to run the OTLs against the temperature gradient that my AC has to maintain. However, they are notably cooler with four 7241s per chassis vs six 6C33Cs.)
Wow....that sucks...it always HOT here...but 100-drz to hot for my OTLs...But it Not Fire!....glad to hear you an yours are ok....dont worry to much about the earth it well be here ...as you know way after were gone....if i get 25-30more years... we all...not just them.. well have got the ball good an hot...So be happy....goodluck
Here in balmy Bethesda, MD, supposedly not Calcutta.
Well he is a OTL/soundLab owner....this has to pull some wate with the Fire gods.....good for him...but what well the next fire breing...gOOD LUCK TO ALL in Colorado....
Thanks Ralph
Thanks Lew....
Goodluck to all of us....it just Colorado today.....
Hell of a perice to pay to live in the west....I think i just go drive around in my car....for no good resion...just kill more OZone ..We all NO that were not makeing it hoter...right...looks like about the time i leve this earth we be have ran it in the ditch....
What we rely need is another War!...Men love,s War...Got too right... his.story..
next to the spare tire, just because i like the color :)
dee
;-D
True terror is to wake up one morning and discover that your high school class is running the country.
quote by Kurt Vonnegut
Lew theorized that humidity might make a difference ...As on most thing Lew is right!
Were at about 80% humidity here in fl...i run the Air..but i open the window to get fresh air...my panels LOST 5-6Db in a min...had to push the bias up to get them back to playing....So you are at the top of ESL spl output..good job...cant wate to here about your sound with your MA1...burn in the 6AS7..you get long life..sounds nuts but it a mustThese 48"X9" panels are so eze to work with... all the Acoustat are the next step of the JanZen...KLH...panel type
Look if i am geting the best topend i have ever got out of any esl ...your on top with the some of the BIGest ESL panels ever...you would think all the base output you get with the soundLabs...the high would be rolled down........the highs on the Acoustat stay the same as with one panel...i just add more panels to get more baseoutput...goodluck
Edits: 06/27/12
Post a Followup:
| FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
||||||||||||||
This post is made possible by the generous support of people like you and our sponsors:
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2013, Audio Asylum, all rights reserved ]
[ Take5 ]
