ESL-4 Electrostatic

Price: $2,500.00

2 item(s)

Electrostatic Advantages
Where the world of traditional loudspeakers deals with cones and domes that are
moved with magnetism, the world of electrostatic loudspeakers (ESLs) deals with
charged electrons attracting and repelling each other.

An ESL consists of three pieces: stators, spacers, and the diaphragm. The
diaphragm is what actually moves the air to create music. The stators remain
stationary, one on either side of the diaphragm. The spacers provide a fixed
working distance for the diaphragm to move between the stators.

As your amplifier sends music signals to an ESL, they are stepped up into two
equal and opposite high-voltage signals that are applied to the stators. The
resulting electrostatic field works to move the diaphragm back and forth to
produce music. This technique is known as push-pull operation and is a major
contributor to the low distortion of the ESL.

Since the diaphragm of an ESL is uniformly driven over its entire area, it can be
extremely light and flexible. These two properties, low mass, and evenly
distributed driving force, are two of the major advantages of ESLs. As a result of
the low mass, the ESL can be very responsive to transients, perfectly tracing the
musical signal. Because the diaphragm is uniformly driven, there are no
resulting breakup modes to color the sound.

With these inherent qualities it is possible to manufacture a single ESL
transducer with the capability of reproducing all the critical frequencies from
above 350Hz to ultrasonics; something no magnetic driver has yet been able to
do. The result is a dramatic improvement in imaging and clarity.

Care and Cleaning
Here are a few suggests to ensure a long life for your loudspeakers.
• Minimize exposure to excessive contaminates such as smoke and dust
• Minimize exposure to direct sunlight to avoid discoloration
• When not in use for extended periods, you should unplug them to
reduce dust accumulation on the diaphragms
• If humidity in your area of the country regularly exceeds 80% it is
recommended that the listening room be air conditioned for optimum

It is recommended that the diaphragm be cleaned yearly, more often if in a dusty
environment. The first step is to leave the speaker unplugged from AC power
over night to allow time for all residual charge to drain off the diaphragm. Then
using a hand held brush attachment for a vacuum cleaner to remove the
accumulated dust from the back of the diaphragm. Slow up and down strokes
with gentle pressure is best. Don’t be alarmed if the diaphragm sucks over and
sticks to the stator while cleaning. No damage will result. To clean the front side
of the diaphragm, remove the grill and repeat the cleaning procedure.
The grill cloth may be cleaned with a soft brush or a hand held vacuum cleaner.
Use a dust free cloth or a soft brush to remove dust from the speaker base and

NOTE: DO NOT use liquid or spray cleaning products to clean any part of the

Description 2-way electrostatic hybrid
Drive Units electrostatic panel (3 in wide x 37 in long)
1/16 in diaphragm spacing, 3kV bias voltage
6.5 in high excursion, neodymium woofer
Frequency Response 60Hz – 22kHz +/- 3dB on reference axis
-6db at 48Hz (useful bass extension)
Crossover Frequency 325Hz (4th order acoustic Linkwitz-Reilly)
Sensitivity 83dB spl (2.83V, 1m)
Impedance 5 ohm nominal (2.5 ohm @ 20kHz)
Recommended Amplifier Power 60W – 150 Watts RMS
Must be capable of driving 4 ohm load
Speaker Cable Impedance Not greater than 0.15 ohm
Dimensions Height: 65 inches
Width: 7.5 inches
Depth: 13.5 inches
Weight 40 lbs each


6522 Midway Rd. Haltom City, TX 76117   -   682-231-2099   -     HOURS (Monday-Friday 11-6) (Saturday 11-3)