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on the topic of directivity and beaming of 2+2s for which "Dan Electron" has a triple pair:
"A totally different ball game when driving with high voltage, a much wider sweet spot with much of the beaming eliminated, extension in both extremes and wide open dynamics, resolution, and detail, impossible with transformer interfaces...
Stock Acoustat servo amplifiers are really not all that good and crap out very fast trying to do real world live dynamics, have harsh beaming highs that fall apart quick along with the image as the frequency climbs. I am using almost 16,000 joules of energy at considerably higher voltage, more than enough to instantly vaporize a crescent wrench, and dangerous enough to kill you before you could blink an eye. Stock servos are unlistenable to me and could never drive more than 4 panels decently, besides being unreliable with tubes that don't last more than a couple years without sounding like crap. I spent the last 40 years developing my servo amplifiers, the parts cost alone is over 20k wholesale, many of the parts custom designed and made to order, to drive the system along with many hundreds of hours of assembly time. The precision of the circuit tolerances only someone as anal as I would ever take the time to select from thousands of parts, over years, ultra precision push pull balanced, distortion is orders of magnitude lower than an Acoustat servo could dream of having."
So...choice of amplification *corrects* a panel's inherent radiation characteristics. Hmmmm. Learn something new everyday. ;)
Follow Ups:
Don't suppose he posted any pics of his amps?
Or any details of what he may have done to them?
Mine do very well with left to right sweet spot. The shift in sweet spot is more noticeable up and down, but then my Monitor 4's are, as you know, only one panel high and not two like his ...- or yours even.
I remember converting my Monitors to the interfaces. Did the panels *change* the way they radiate into the room? No.
Just returned and found some more details. I requested some pics.
" There are other mods not many know about doing, like a DC ultra low noise regulated and adjustable high voltage bias supply, removal of the electrolytic capacitor still in parallel with the poly cap to use all poly, better quality high voltage coupling capacitors, better wiring and speaker terminals, magnetic, hydraulic circuit breakers etc."
Thank you, Mr. E-Stat.From that additional snippet, it's beginning to sound as though he and my servo amp builder, Mr. Mike Savuto, have been in contact with one another.
Much, if not all, of what he's mentioned are mods Mike has built into my servos.
BTW, if he's running six servos, I can easily understand how he's spent the $20k he claims.
Edits: 08/31/21 08/31/21
16,000 joules of amplification? Do you know the value of the power supply caps in yours?
My 300 watt MB-450s are pretty decent at 250 joules each.
Not sure what happened to that post, but half of it ended up in the bit bucket somehow.As I was saying:
Not sure off top of my head. It's be a bit of a PITA to look, but next time I have them out of service I'll check. Or another idea ... I'll call Mr. Savuto and ask him.
Although my take on that is that it was 16,000 spread across six servos. My further assumption is that he's running one servo per 2+2.
There's a pic in my gallery that shows the underside of the chassis, but I can't make out what it says on those big Audience caps. Those caps are the size of a Coke can.
Edits: 08/31/21
Not sure off top of my head. It's be a bit of a PITA to look, but next time I have them out of service I'll check. Or another idea ... I'll call Mr. Savuto and ask him.Although my take on that is that it was 16,000 ÷ 6. My further assumption is he's running one servo per 2+2.
Edit: There's a pic in my gallery of the underside of the chassis, but I can't make out what it says on those big Audience caps. Those caps are the size of a Coke can.
Edits: 08/31/21
that would require 1280 uF at 5000V - or about 210 uF per amp.
The largest value 3 kV caps I can find on Mouser are 2.5uF and running a pair in series for 6 kV operation would yield a fourth of that. There are some rated for 5-6 kV but at far lower capacitance.
That's a whole bunch at that voltage!
I just tossed my 50Khz power supplies in the trash frim my servo experiments. I stopped because it was getting too unsafe. They worked very well, silent background. However the ambilocal cords scared me. During testing, I was able to measure a peak of 28ma per phase on the god mod. The god mod on my amps was putting out 7100 vdc with no signal.
Ask Mike about the magnetic/hydraulic breakers.
There's a good chance he'll tell you that with that change it'll negate the need for the God Mod - can go back to one HV trans and reduce risk of trans failure.
Those breakers are a bit of a game changer.
Imagine that. You learned something new today.
Write that on your calendar dude.
Dave.
Wonder how his modded amps would perform vs Sanders ESL amps in mono block configuration?Power (Monoblock Version) 1000 watts RMS into an 8 ohm load
1600 watts RMS into a 4 ohm load
Edits: 09/03/21
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