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 What is lowest useable frequency of a single panel electrostatic?
 
This is an excellent question and one that most designers of els products - both esl panels and esl step-up transformers - don't wont to talk about as they are selling their products as being " full range ESL speakers."
As far as I know, we are the only esl manufacturer that shows real measurements of our products under real world conditions. From my research work there are four major factors that will determine the low frequency limit of an els speaker:

1)Panel size in square inches to produce a given spl for a given size room.
2)Transformer turns ratio to produce a given spl
3)Baffle width to lower effects of dipole cancellation
4)Placement of speaker in the room (room modes)

The most important factor in a SINGLE ESL PANEL design is the esl step-up transformer which - at best - can only produce up to seven usable octaves of flat frequency response. The designer may choose which of the seven octaves he wants to use. 
The Model 2.1 and 3.1 have a usable frequency response of 175 Hz to 20 kHz with the M299A step-up transformer and crossover. Both models could be used down to 50hz with a bass step-up transformer (with a much higher turns ratio) but the transformer would then only be able to produce up to about 6khz frequency response.  
Even if you decided to use such a transformer with these panels, however, the total low frequency output of the panels would suffer greatly because of the front to back dipole cancellation effect so you would gain little. There are many more suttle factors that have to be factored into each esl design but the two mentioned above are the most important ones to
start with.

Why should do you sell only internet direct?

Differences between  ESL flat versus curved panels

Why use dipole woofer over closed box woofer?

I've heard that your speakers are hybrid speakers.

What makes them sound so good?

How does the electrostatic design work?

What are some advantages of electrostatic speakers?

What is the warranty period on your speaker system?

Our speakers have a 90 day warranty which can be extended ask about details

Why is electrostatic speaker technology claimed to be superior to other technologies?

How is  full-range electrostatic speakers have such profound bass response?

Why are  Full-range Electrostatic speakers so big?

 Why do your speakers need to be plugged into the wall outlet?

 How far from the back wall should the speakers be placed?

 What is the Optimum Room Size?

Are Your Speakers Affected by Humidity?

Do Your Speakers Deteriorate With Time?

 Which type of Amplifier works best, Tubes or Solid-State?

What is the Minimum Power that you Recommend?

  The high-impedance of our speakers in the lower frequencies (where the musical spectrum is most demanding) results in a greatly reduced current drain from the amplifier. So, both types of amplifiers run cooler, exhibit less distortion and last longer. Our speakers are very neutral , so the amp used would be what you prefer sounds best. 
I personally recommend 80 to 125 watts minimum. However, we have customers that use 30 watt tube amplifiers and find them to be satisfactory. At one-meter sensitivity of our speakers  is approximately 87db.  At four-meters this relates to about 100db due to being a line source. This is typical of the more efficient high-end speakers.

How far from the back wall should the speakers be placed?

The distance is not particularly critical. I would suggest about 3 feet. Toe the speakers toward each other slightly. If the speakers must be placed against the back wall, make the toe-in angle large, on the order of 35 degrees. This does not affect the sound as the speakers provide full spectrum sound over the entire dispersion angle. 

How should the speakers be cleaned?

Cleaning if required, but is easy to do. The electrostatic panels may be vacuumed with a brush attachment. The hard-wood  may be wiped with a damp cloth, and a coat  or furniture wax applied.

I think my speakers have developed a problem. The right speaker is hissing even when the amplifier is disconnected. Your speakers are dusty. The electrostatic charge on the diaphragm has attracted some airborne dust or pollen. This is easy to fix. 
First unplug the speakers for about 3 hours. This will allow the charge to dissipate. Then vacuum the front and back  of the panel with a very strong vacuum. Don't worry about damaging the membrane. Plug your speakers in to the AC outlet again and ENJOY!