Electrostatic Speakers

 
DESIGN PHILOSOPHY
 

Roger Sanders built his first ESL (ElectroStatic Loudspeaker) in 1972.  He quickly appreciated the superior performance that a massless electrostatic offered over conventional magnetic speakers with regards to low distortion, lack of resonances, and incredible detail.  But their problems of limited output, inability to produce deep powerful bass, and unreliability have kept him busy improving them over the last 30+ years.

Sanders Sound Systems Electrostatic Speaker Model 10 in cherry

The result of this lifetime of work is that Sanders Sound Systems ESLs are the only ones to have solved all the  problems and limitations of ESLs.  Roger's "Ultrastat" panels will play at ear-bleeding levels, cannot be arced, do not use or need protective circuitry, are immune to humidity, dust, and dirt, and do not need or use dust covers.  They can be driven by multi-thousand watt amplifiers without damage.  They are more rugged than conventional magnetic drivers.  They do not fail and are so robust that they come with a lifetime warranty.

 The Absolute Sound has Awarded our Model 10c Electrostatic Speakers

(click image below to view award)

hpaward

A major part of his work was devoted to dealing with the issue of high frequency "beaming" in large, planar loudspeakers.  To deal with this issue, he invented the free-standing, curved, electrostatic panel.  This made it possible to widely-disperse the high frequencies from a large ESL.  He published this invention in Speaker Builder Magazine in 1980.  The Martin Logan company adopted his technique in their ESLs.

Roger expected that his wide-dispersion, curved panels would perform better than narrow-dispersion, planar speakers. But he discovered that the curved panel was inferior to a planer one with respect to transient response, imaging, frequency response, speaker placement, and output.    These problems caused by wide-dispersion speakers spraying their sound all over the room instead of being directed at the listener.  As a result, in a wide-dispersion speaker, the listener hears the room with all its confused and delayed reflections instead of the superb sound available directly from a planar ESL.   Roger won't compromise the quality of the sound by using his wide-dispersion design, so he abandoned it in favor of planar ESLs.  The sound from his planar speakers are superior to all others with regard to transient response, 3-dimensional imaging, and frequency response.

audiogonmovie
"Roger Sanders, inventor of the curved electrostatic loudspeaker, will make you rethink everything you always thought you knew about stats. He sure did (rethink everything) to the point of abandoning his own invention for a contradictory philosophy. His logic is irrefutable, his speakers are infallible, and his electronics are unstoppable. Check out this video for a crash course on electrostatic myths and mating." - Audiogon

 

Full-range, crossoverless ESLs are widely believed to be the "holy grail" of loudspeakers.  In theory, using a single drive to reproduce the entire audio range, without the problems introduced by crossovers, would be ideal.  Roger has built many such speakers.  But the laws of physics cannot be circumvented.  A full-range ESL simply cannot produce deep, powerful bass or have generally high output and full dynamic range.

Roger spent 17 years developing woofer systems that would blend seamlessly with a massless ESL to produce outstanding bass and end the frustrating limitations of full-range ESLs.  His well-designed, hybrid systems are far superior to a full-range, crossoverless ESL.

While building and selling full-range ESLs is easier and less costly than a hybrid, Roger won't compromise .  Therefore all Sanders speakers are hybrids.

Crossovers are a major limitation in conventional speakers.  The passive crossovers typically used are seriously flawed and cannot be used if you want a speaker with the highest possible performance.  Electronic crossovers and bi-amplified operation are far superior to passive crossover systems and are absolutely essential for spectacular speaker performance.  Therefore, all Sanders' speakers come with electronic crossovers (your choice of analog or digital) and bi-amplification.

Sanders Sound Systems Electrostatic Speaker Panel Close up

To eliminate the usual customer complaint about having to buy two amplifiers to operate bi-amped speakers, Sanders supplies a bass amplifier as part of each speaker system.  The customer then only has to provide a single amplifier of his choice just as they would for any conventional speaker system.

These amplifiers are not cheap, underpowered, or Class D switching amplifiers.  They are multi-hundred watt, Class AB amplifiers that are very expensive, offer the finest in performance, come in beautiful chassis, and will drive the speakers with full dynamic range at realistic, concert hall levels.

When a speaker system is put in a room, it will interact with the room and this will have adverse effects on the sound.  Even a "perfect" speaker system will be degraded by the room.  It therefore is essential for all speakers to be adjustable to compensate for room effects.  The electronic crossovers used in Roger's speaker systems have extensive controls to allow the user to adjust the speaker to compensate for the flaws in his listening room.

 

This adjustability means that the user can make the speakers sound almost any way they wish.  It is no longer necessary to be "stuck" with the particular sound of a room/speaker combination as is the case with conventional speakers.  If you don't like what you hear with Sander's electrostatic speakers, you can adjust them so that they sound the way you like.

 

In summary, Sanders' speakers use the finest technology and design possible.  No compromise is made to either to reduce cost or sacrifice any aspect of speaker performance.   The combination of electrostatic mids/highs, transmission line woofers, and fully adjustable electronic crossovers makes it possible finally to have a speaker system that can do it all without compromise.

Currently, we have two models available:
10c Latest version of Model 10c; full size speaker with digital crossover and Magtech Amplifier (top images)

11   Smaller version of the 10c (bottom mages) with digital crossover and ESL Mark II Amplifier

 MODEL 10

Model-10-Cherry-Front

Sanders Sound Systems Electrostatic Speaker Model 10 in walnut
 
MODEL 11
 
Model-11-walnut-front
Sanders Sound Systems Electrostatic Speaker Model 11 in walnut
 
What is the difference between our Model 10 and our Model 11 speakers? Here is a comparison of the specifications.
 

SPECIFICATIONS

SAME?
Y/N

MODEL 10

MODEL 11

 Speaker Dimensions

N

15" W x 18"D x 69" H

(38cm x 45cm x 175 cm)

11" W x 13"D x 64" H

(29.9cm x 33cm x 162.6 cm)

 Speaker Net Weight   (assembled)

N

80  pounds (36kg)

 60  pounds (27.3kg)

 Shipping Weight

  5 boxes

N

Total shipping weight 250 lbs

(113 kg)

Total shipping weight 200 lbs

(90.9kg)

 ESL Panel Size

N

15" x 42"

(38cm x 106.7cm)

 11" x 40"

(27.9cm x 101.6cm)

 ESL Power Handling 

Y

Unlimited for any amplifier intended for domestic use

 Unlimited for any amplifier intended for domestic use

 Bass Driver

N

10"

 8"

 Bass Design

Y

Transmission Line

 Transmission Line

 Sensitivity 

Y

94 dB

 94 dB

 Frequency Response

Y

20 Hz. to 27 KHz. +/- 2 dB

 20 Hz. to 27 KHz. +/- 2 dB

Crossover Frequency

N

User adjustable

Factory settings 172 Hz, 48 dB/octave slopes,  Linkwitz-Riley filter

User Adjustable

Factory Settings 260 Hz, 48 dB/octave slopes,  Linkwitz-Riley filter

 Crossover Dimensions

Y

17” W x 6” D x 1 ¾” H

(432.cm x 15.2cm x 4.4cm)

17” W x 6” D x 1 ¾” H

(432.cm x 15.2cm x 4.4cm)

Amplifier Type / Power

N

MAGTECH AMPLIFIER

500 watts RMS per channel into an 8 ohm load

900 watts RMS per channel into a 4ohm load

ESL AMPLIFIER

360 watts RMS per channel into an 8 ohm load

700 watts RMS per channel into an 8 ohm load

 Amplifier Dimensions

Y

17" wide x 5.5" tall x 16" deep

(43cm x 14cm x 40.6cm)

17" wide x 5.5" tall x 16" deep

(43cm x 14cm x 40.6cm)

 Weight 

Y

52 pounds (23.6kg)

52 pounds (23.6kg)

 
 
 
 
 
Two wood finishes available:
Sanders Sound Systems Electrostatic Speaker CherrySanders Sound Systems Electrostatic Speaker Walnut
Shown on left is a Model 10 in Natural Cherry & on right is a Model 11 in Natural Walnut
NEW! We have now added a black finish.
 

 

 
BEHIND THE SCENES
 
  

contactCONTACT USSanders Sound Systems Contact Us

Sanders Sound Systems
12054 Deer Trail Road
Conifer, CO 80433

303-838-8130

Roger Sanders 

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We are so confident in the design and build quality of our products, that we offer a

Sanders Sound Systems Lifetime Warranty

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