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In Reply to: RE: I will check tonight posted by Penguin on June 11, 2012 at 09:46:06
I moved the modded backplane to the other side and it works with both amps...
Now i need to figure out, where is the damage. I read somewhere that you can crete a temporary fix using silicone :). One of these days i need to ship them to soundlab for repairs.
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
Follow Ups:
Take a flashlight and shine it through the spandex as you examine every rectangle in the speaker frame, looking for holes or tears in the diaphragm. Typically they occur at the edges, where the frame impinges on the mylar. Typically you will find them along the topmost row of rectangles, nearest the top edge of the frame. If one or two are "holey", you can repair that by "killing" that rectangle, using silicon caulk. You will have to slice an opening in the spandex so as to admit the nozzle of the silicon caulk tube. (I did it at the rear so the damage to the spandex is not seen from in front.) Then squeeze the tube so silicon caulk is deposited between the mylar and the stator. This will eventually cut off the capacity of that rectangle to respond to audio signal. It's actually a permanent fix, unless or until too many of the rectangles are affected. You won't hear any difference between the affected panel and the intact one (after repair). if it's only one or two or three rectangles flapping.
SO i put the un-altered backplate with the "damaged" panel...and it sounds quite alright, the modded backplate is with the other panel and it is just fine, quite a bit more dynamic and open sounding, but the two sides together are listenable and no rattling distortion is noticeable....If i swap the backplates, and the modded (no resistor) backplate drives the "damaged" panel then the sound is quite distorted from that panel. SO it still puzzles me what would the resistor across the toroid do to eliminate most of the distortion? Does it somehow dampen the diaphragm? preventing it to slap against the stators? Really strange. I am trying to recollect everything i learned about electrostatic fields and forces, but cannot come up with a good explanation. Maybe the fact that the membrane really sees about 8K across the secondary of the toroid when when the 8ohm resistor is in place and infinity when not, allows it to move more freely and the tear can actually be more independent from the rest of the membrane...I do not know, but trust me you would be sitting here scratching all your hair follicles if you were sitting here listening to the panel with the resistor in and out. with the resistor out it is unlistenable, with the resistor in, you can drive it quite hard before it starts to distort. I am listening to it right now, the system probably plays around 80 - 85 DB and no buzzing .
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: 06/12/12
I am at a loss to explain your observation except to hypothesize that the speaker is so much more efficient and dynamic without the parallel resistor that perhaps you are able to put enough more energy into the speaker (rather than speaker + resistor) such that it excites a resonance that is not evident otherwise. Also, 80 to 85db is not very loud. "Loud" starts above 90 db at my listening position, by my reckoning.
Anyway, good choice of what to do.
80-85 is my normal listening volume :)...agreed loud is 90+.The salient point here is that the mod exposed a fault in the system that is not obvious without the mod. Morale is that when people perform these mods and things do not work, the cause may be a pre-existing problem, it was just covered up. The normal swapping backplates, visual check, etc is still the first line of defense.
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: 06/12/12 06/12/12
Heres the two things that CAN make a man NUTs.... the on paper best ESL ever made...an you can figg the other
First of all, neither Ralph (I am sure) nor Lew want to take the responsibility for what might happen as a consequence of any of these mods. So, neither he nor I want to be on record as advocating anything that goes against the advice given by Sound Lab (i.e., Dr. West) regarding the use of their speakers.
So here we are......or you are...well...I had the SL A1 here...for about 6weeks....3 years a go...i did some mods too the A1s that had worket on the Acoustats....these A1 had older tranfourmers..one thing i saw was the panels are so big... that i new thay would not work for me... the Acoustats M3 with 3 panels in each speaker.. thay did not work much better but had a much better SPL.....So the A1 went to a new owner.
So what i well say about the SoundLab mod is this....i would only use the New Fullrang tranfourmers like Lew an others have done!
I would not on my new panels use the stock high frc. tranfourmers with this mod...but that just me ...
Just one ESLs OTLs lovers 5cent..... goodluck
for the cost of roundtrip shipping plus the work, they will be as good as new, and with the transformer mods, i do not not think i need to go PX either. Talked to Brent today. The cores will be trucking out on monday. I could try the caulk fix, but then it will be messier to deal with the repair at the factory. I can live without them for a month or so anyway.
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
need to arrange shipping.
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
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