24"x48" stator at 3/32nd gap.... - diyAudio
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Old 13th October 2011, 11:29 PM   #1
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Smile 24"x48" stator at 3/32nd gap....

24"x48" stator at 3/32nd gap.... 2 micron film. Lexan clear spacers.

What kind of performance can I expect if these are powered correctly and (obviously) built correctly?

By the way... my first post... Hello everyone!

I would like a somewhat powerful but not party level loudness. Basically a system capable in an average smaller living room of playing very distortion free choir and symphonic music. I do not have to blow the doors off.

I would like to cross at 80-90 hz if possible. The sub will be a down firing sealed unit in corner of room.

These will be as transparent as possible. Jazzman has referred me as a couple of ESL experts are said to reside here... ;-)

Have read over quite a few builds but want to do my own.

Thanks
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Old 14th October 2011, 12:50 AM   #2
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your panel size will result in a very directional speaker. Why so big? See if you can audition a pair of Acoustat 0ne plus 0ne`s just to get an idea of what a much smaller panel can do. Best regards Moray James.
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Old 14th October 2011, 01:10 AM   #3
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Default why so large?

Well. I am wanting to build a speaker with no crossover in the upper. I also want to build an electrostatic that is crossed at 80-90hz. If this can be done 18 inches wide instead of 24 I am very fine with it.
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Old 14th October 2011, 05:43 AM   #4
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I can't though can it?
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Old 14th October 2011, 06:52 AM   #5
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Are you going with perf metal, cube louver, or what? I haven't built myself, but I've had several models of Acoustat, all of which used 9" x 46.25" panels, with some models also incorporating 8" x 46.25" panels. As Acoustat added panels to create wider speakers, they angled the panels relative to each other. Sound Lab does essentially the same thing, although they go about it quite a bit differently than Acoustat did. That neither of them simply used a single, wide panel should tell you something.

Good luck, whatever you decide to do. Keep us posted on your results.
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Old 14th October 2011, 07:55 AM   #6
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Yes. Two panels indicates a probable roll off of high frequencies? I was thinking of adding a backfiring dome tweeter to aid in widening as the high frequencies are the fastest to fall off. Acoustat panels of that size go down to 250hz and I am wanting to cross at 80hz. Their is a severe roll off of highs in any concert hall. A natural sound with electrostatic clarity might be nice and well... more natural sounding. I have not ordered any metal but have ordered my Lexan and the Mylars and glue at this point. How do backfiring tweeters effect soundstage and imaging and the like? Was that just a fad from a decade or more ago? No cross up high is still the goal.
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Old 14th October 2011, 08:05 AM   #7
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Perforated metal is what I will use.
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Old 14th October 2011, 01:44 PM   #8
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Acoustat panels go FAR deeper in the bass than 250Hz, I don't know where you got that figure. Almost every Acoustat model ever made were full-range electrostatics, no crossover or woofer at all. I've gotten real 20Hz response in my room from Acoustat panels alone. I think a single 9" Acoustat panel might be sufficient if an 80Hz crossover were used. But, enough about Acoustat.

I can't imagine any reason you'd need to add a tweeter to a 'stat. Properly done, an ESL should have excellent HF response without any supplement from a dome. Kinda contrary to one of the main selling points of ESL: coherence due to no crossovers or merely a single LF crossover point. Using two panels should not cause any HF rolloff.

I haven't heard Jazzman's ESL project, but they look awesome and apparently sound as good as they look.
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Old 14th October 2011, 04:50 PM   #9
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There are some one inch dome tweeters which have an Fs or around 600 Hz and are crossed under 1KHz. that ought to tell you something. The 0ne plus 0ne is Acoustat`s best speaker in terms of stage and image. I guess that you need to prove this to yourself so build what ever seems good to you listen and find out for yourself. Wide palels will sound great but you will need a vise to clamp your head in while you listen to them. The larger your panel the harder it will be to drive. Why don`t you start with a 6 inch wide line source 7 ft. ten inches tall first and see what you think? Then if you want to go larger try 8 inches wide. 0ne plus 0nes can make good bass when driven by an amp that can actually carry the load and not take a fit. The larger the panel the harder it will be to find an amp which will work and sound good doing it. Lots of good amps will run a stat panel but few actually sound really good doing so. Do yourself a favor find a set of 0ne plus 0ne`s or Two plus Two`s and give them a listen before you build. The information that you have on these speakers is not correct. Acoustat`s remain as one of the most successful (if not the most sucessful) full range stat panel ever brought to market. I know that Jim Strickland really knows a thing or two. Listen to the competition and find out what you are up against. A lot of great R&D has gone into many products so take advantage of it and save yourself a lot of hard work. Best regards Moray James.
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Old 14th October 2011, 10:41 PM   #10
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Well to be clear it was an Acoustat model 9 x 30 ish panel that was built to add the sub. A hybrid. The specs are on the sell page for the unit and 250hz is listed as the low. I am glad to hear your thoughts on not needing a tweeter. Any body ever figured out how Martin Logan bends theirs.... the air press method? Or is it really a man with a Jack Daniels t-shirt and barrel hitting the stators which are referenced in the literature as "a breakthrough gaseous biological pressing machine able for the first time to mimic the human movement conceived by evolution." I would like a slight bend but it must be difficult - a shop could do it... anyone have it done?
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