System that sounds so real it is easy to mistaken it is not live

@lewm , tell me about it. For some strange reason Sowter stopped making ESL transformers and the ones I have found are peanut 50 or 75 to one jobs that will not handle the power I could throw at them. That resistance is primarily in the treble region, that Brilliance control which I roasted fine tuning it. I substituted the appropriate sized power resistor and it will heat the chassis almost to the point where you can not keep a hand on it. More wasted power. You still have to keep a resistor on the primary for most amps, just an ohm or two to keep them from shutting down. Since I take the bass and can fine tune the frequency response digitally I should easily be able to get away with one transformer and maybe a resistor if I could fine one with suitable power handling. I do not think the HF toroid will handle it. Roger is of the mind that you do not want to modify his speakers for any number of reasons.

@atmasphere , Ralph, do you know any makers of ESL transformers that could supply a 100:1 step up able to handle 200 watts continuous with a frequency response of 100 Hz to 20 kHz?

Many years ago, I recall reading some literature about Klipsh.

Their contention was that one of the most difficult sounds to reproduce was 

scissors cutting a piece of paper.

richopp:

I also have difficulty placing things during that time period for some reason.

Duane died when I was a sophomore in HS, so that narrowed it down to 71 (as I recall that it was around Halloween).

I saw them in Des Moines, Winter of the following year, and ended up driving to Illinois to  their next concert the following day.

No Dwayne, but Betts was incredible (playing from a pool of sweat both times). 

DeKay

Dear @mijostyn : My dynamic type speakers can be operated in line source or point source fashion, we have to remember that ADS designed it as true proffesional/studio monitors and not for home systems.

My seat position is at 2m.-3.m. and sensityvity ADS spec is 95db. Normally I listen it in the 80's db SPL and only go to 95db SPL at seat position or even a little higher when I’m testing or comparings audio items. I like to take care of my way limited ears.

Btw, thank’s @atmasphere .

R.

@rauliruegas , I think we may have different definitions of point and line source.

A point source is a driver that is smaller in all dimensions  than the shortest wavelength it is to reproduce. I line source is a driver that is larger in at least one dimension than the largest wavelength it is to reproduce. There are drivers that can be line sources at higher frequencies and point sources at lower frequencies. There are only two drivers that are line sources from zero hertz to over 20kHz. The first is an infinitely tall one and the second is a tall or long one that both ends terminate at fixed barriers like a floor, ceiling or wall. It is impossible for a driver to be both full frequency line source and full frequency point source. It is actually very bad for a speaker the swap radiation characteristics mid audio band as the power projection is very different and will cause frequency response  aberrations that vary with distance. 

Both my ESL and subwoofer systems end at fixed barriers. My system is line source from zero to as high as the ESLs will go which is probably not higher than 18 kHz. Roger West won't publish that spec. I am toying around with inserting a ribbon tweeter to go from 12 kHz up. This would relieve the main amp from having to deal with the crazy impedance curve of ESLs up there and give me a little more flexibility. I will have to biamp it and add a second digital crossover.