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Old 12th February 2010, 11:11 PM   #131
mavric is offline mavric  United States
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my amps are Adcom gfa-gfa-545 with roman # 2 beside it, rated at 100*2@ 8 ohm and 200*2 @ 4 ohm, both are the same and have instant clipping alerts per channel built into the front. I even had an old friend test the alerts with his scope, he does or did repair work, and told me there dead on when a square wave was present, so thats were my crossover somes in, i guess like Charlie had mentioned, better safe than blowing up your amp. I hope that makes sence, i have to be a liitle brief as my wife is well, what wifes do when you are the computer. Bi@#$.
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Old 13th February 2010, 12:13 AM   #132
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i will look it up,i thought you had the gfa-555 so i was reading the manual and reviews on that one. while i was looking it up i found this, http://www.sanderssoundsystems.com/index.php?option=com_content&task=view&id=55&Itemi d=134 the guru has done it again,im so jealous. i have the utmost respect that man,roger sanders.i'll always cherish the moments that i had conversations with him and how he was kind enough to help me a little pee on diy'er and give me some insights on his methods,views and technologies. thank you roger, thank you. jer
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Old 13th February 2010, 12:57 AM   #133
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Quote:
Originally Posted by geraldfryjr. View Post
i will look it up,i thought you had the gfa-555 so i was reading the manual and reviews on that one. while i was looking it up i found this, http://www.sanderssoundsystems.com/index.php?option=com_content&task=view&id=55&Itemi d=134 the guru has done it again,im so jealous. i have the utmost respect that man,roger sanders.i'll always cherish the moments that i had conversations with him and how he was kind enough to help me a little pee on diy'er and give me some insights on his methods,views and technologies. thank you roger, thank you. jer
I feel the same way about Mr. Sanders; although I've not had the fortune to communicate with him personally. I got the basic idea for my beam splitter TL from his "cookbook" (radically modified, of course) but if had had seen the speakers he's building now, I might have taken a different path with mine-- I really like his compact TL configuration. Unfortunately, it looks like his new ultra-stat panels would not easily lend themselves to DIY.
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Old 13th February 2010, 01:06 AM   #134
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i don't for see any problems using your gfa-545's for normal listening levels,but if your any thing like me my listening levels are not normal(ha ha ha).seriously though ,i don't really forsee any problems driving your panels with reference to load impedence unless you plan drive them hard,in which case of course you just get a bigger amp.all of the reviews i have read none of them were bad.i almost got a set of adcoms back in the mid to late 80's to power some infinity sm-150's, but i had a big ol maranzt 70 or 90 watt that did the job quite well. those were some rockin speakers 300 watt rms at 101db sensitivity, loud and clean, yea ,thats the way i like it!what kind of loads have you tried since you said they don't like anything less than 4 ohms?just wondering, because i once had a sansui g-9000 (biggest receiver ever made 160 wpc it was in mint condition that i got in a pawn shop for $200)that blew up when i had 3 speakers (2.6ohm load)hooked to it. needless to say it was stolen after that (ha ha ha ha ), ironicaly just last week i found the service manual online for free, now i'm p.oed all over again.becuase if i didn't or couldn't repair it i would have had it done! jer p.s he explains this in his new white paper

Last edited by geraldfryjr; 13th February 2010 at 01:22 AM.
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Old 13th February 2010, 01:30 AM   #135
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i should call him and ras em up a bit. but he'll probaly not remember me anyway!so i reepect him very much and hope he does well with his new model. jer
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Old 13th February 2010, 02:17 AM   #136
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Quote:
Originally Posted by geraldfryjr. View Post
i will look it up,i thought you had the gfa-555 so i was reading the manual and reviews on that one. while i was looking it up i found this, http://www.sanderssoundsystems.com/index.php?option=com_content&task=view&id=55&Itemi d=134 the guru has done it again,im so jealous. i have the utmost respect that man,roger sanders.i'll always cherish the moments that i had conversations with him and how he was kind enough to help me a little pee on diy'er and give me some insights on his methods,views and technologies. thank you roger, thank you. jer
I feel the same way about Mr. Sanders; although I've not had the fortune to communicate with him personally. I got the basic idea for my beam splitter TL from his "cookbook" (radically modified, of course) but if had had seen the speakers he's building now, I might have taken a different path with mine-- I really like his compact TL configuration. Unfortunately, it looks like his new ultra-stat panels would not easily lend themselves to DIY.
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Old 13th February 2010, 03:30 AM   #137
mavric is offline mavric  United States
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Jer, i have had these amps for quiet sometime. I used one to run four 8" carbon mid bass w/passive x-over for at least 10 yeras, the other was for surround on small rear speakers. 6/1/2 nothing special. these amps are very heavy, the power supply takes up most of the room. but as mentioned, i have never tried anything below 4 ohm on these amps. they are fused in i think, four different places, and unfortunatly as i have grown older, the fuse rating is probally what should NOT be there. That will be addessed as well as the build, like Charlie, i allways have a back up amp. the same of course.
there is another question Jer, are you telling me that i can run my stats without any issue? or should i be precautious and use the cross over? From what i have read, the impeidence will rise at high freqency, but not drop below low???? I guess i need some more sleep, 60hrs, and still tomorrow.
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Old 13th February 2010, 05:39 AM   #138
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yes, your amps will be fine the amp i used was a (don't laugh) lxi from sears (now you can laugh) that was rated at 100 wpc ,but only did like 35 wpc clean and a aiwa cd unit thats supposed to do 80 wpc, but it don't and they worked okay,loud enough to enjoy though.thats my problem i don't have any way to properly drive them right now and i only have one tube output transformer to work with right now.your amp is rated at 150wpc at 4 ohms and pretty sure 3 ohms wont hurt them as they are professional high quality amps,however 2 ohms might be pushing it, as with all amps.yes you can run without a crossover it won't hurt them but if your using a d/s of 1/16" then there is the possibility of the diagphram hitting the stator making a slapping sound like woofers do on the low notes when they bottom out.it sounds awlful but it is not going to damage the diagphram.on ocasion the mylar might stick to one of the stators in which case you turn off the bias let it discharge and then power it back up again.you will be amazed at the sound when running fullrange (no crossover),you may even prefer it.it is suggested that you use a larger d/s spacing if decide to go that route i used 3/32"on mine which coresponds the 1:100 spacing vs width (.090"/9") ratio for 12" wide panel i would consider 1/8" but i would start with 3/32".anyway i am assuming your going to use a woofer,so 1/16" spacing is best for a nice high efficiancy panel remember high efficiancy is what were after anyhow,quality comes with nature of the beast.i hope this help,let me know if you don't understand and i will do my best to explain. jer
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Old 13th February 2010, 10:09 AM   #139
Calvin is offline Calvin  Germany
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Hi,

the low resistive impedance value at elevated frequencies is usually not the point of problem with typical amps featuring global feedback. Its rather the complex load of the panel, i.e the required additional complex current part that stresses the amplifier over due and the phase shift that eventually makes an oscillator out of the amplfier. Try the search function to find infos. That´s the reason why transformer coupled amps (tubes) and global feedback free amps typically have less problems driving ESLs.

"Unfortunately, it looks like his new ultra-stat panels would not easily lend themselves to DIY."
Actually it is probabely the easiest way, because You need not build anything Yourself. Just send Your PCB manufacturer of choice the layout-data. Every PCB-manufacturer is able to manufacture such a stator after Your fashion only limited by size constraints.
You can achieve similar results with single sided PCB material and the copper side coated with an insulative coating (see Beveridge, see Quad, see Ron Wagner´s book).

jauu
Calvin
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Old 13th February 2010, 12:56 PM   #140
mavric is offline mavric  United States
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Jer, thats exactly why i purchesed a variable crossover, as you said that brand was fantastic. I guess that way, i can turn off the powered subs, attenuate the lower freqency, and see how it sounds at a lower volume of course.
I myself like loud or better said, room filling with no distortion, so if i want to play to play music, say , eating diner or just something to listen to while i do work around around the house, i can lower my cutt off and hopefully not have that slapping sound, if so, raise the cutt off higher and use the subs for the extra oohmph, am i correct on this?
on another note, next weekend, I will try and meet up with Charlie, cut the panels, smooth the edges, well, prep them up to have them sprayed.
I will post the whole process of spraying on you tube, but untill then, i need a name so everyone here will know what to look for when they search it. Do my best of posting pics of prep work as i have seen no one do a "start to finish job here"
SO, Charlie, Jer, Calvin, thank you for your support, as i get some time. i want to crunch the numbers on the amp setup as well as if my amps will handle full range. Charlie has had his for some time now, breathtaking sound, so that is my goal. like a picture is worth a thousand words, Charlie's esls have my up most attention,,Klipsh has nothing on this, BTW, did some home audio, i was the helper, but it was so crazy using seven channels, not mention getting it to sound right, the phase shift will probally be a benifit in my home set up, and difusing will work even better.
Everyone have a great weekend, anniversary tomorrow, work today, everyday, so please dont close this post, I will be gone for a little while.
thanks diy, and everyone here, this site is nice i would NOT recomend it to anyone, only people that are inclined to do something differnt, which is few or none. Take care
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