Electrostatic Advantages

How can sound be reproduced by something that you are able to see through? Electrostatic energy makes this possible.

Where the world of traditional loudspeaker technology deals with cones, domes, diaphragms and ribbons that are moved with magnetism, the world of electrostatic loudspeakers deals with charged electrons attracting and repelling each other.

To fully understand the electrostatic concept, some background information will be helpful. Remember when you learned in a science or physics class that like charges repel each other and opposite charges attract each other? Well, this principle is the foundation of the electrostatic concept.

An electrostatic transducer consists of three pieces: the stators, the diaphragm and the spacers (See Figure 19). The diaphragm is what actually moves to excite the air and create music. The stator’s job is to remain stationary, hence the word stator, and to provide a reference point for the moving diaphragm. The spacers provide the diaphragm with a fixed distance in which to move between the stators.

As your amplifier sends music signals to an electrostatic speaker, these signals are changed into two high-voltage signals that are equal in strength but opposite in polarity. These high voltage signals are then applied to the stators. The resulting electrostatic field, created by the opposing high voltage on the stators, works simultaneously with and against the diaphragm, consequently moving it back and forth, producing music. This technique is known as

push-pull operation and is a major contributor to the sonic purity of the electrostatic concept due to its exceptional linearity and low distortion.

Since the diaphragm of an electrostatic speaker is uniformly driven over its entire area, it can be extremely light and flexible. This allows it to be very responsive to transients, thus perfectly tracing the music signal. As a result, great delicacy, nuance and clarity is possible. When you look at the problems of traditional electromagnetic drivers, you can easily see why this is so beneficial. The cones and domes which are used in traditional electromagnetic drivers cannot be driven uniformly because of their design. Cones are driven only at the apex. Domes are driven at their perimeter. As a result, the rest of the cone or dome is just “along for the ride”. The very concept of these drivers requires that the cone or dome be perfectly rigid, damped and massless. Unfortunately, these conditions are not available in our world today.

To make these cones and domes move, all electromagnetic drivers must use voice coils wound on formers, spider assemblies, and surrounds to keep the cone or dome in position (See Figure 20). These pieces, when combined with the high mass of the cone or dome materials used, make it an extremely complex unit with many weaknesses and potential for failure. These faults contribute to the high distortion products found in these drivers and is a tremendous disadvantage when you are trying to change motion as quickly and as accurately as a loudspeaker must (40,000 times per second!).

Figure 19. Cut away view of an electrostatic transducer. Notice the simplicity due to minimal parts usage.

Figure 20. Cut away view of a typical moving coil driver. Notice the complexity due to the high number of parts.

14 Electrostatic Advantages

Center Channel speaker specifications

The MartinLogan Center Channel speaker is a sophisticated audio component designed to deliver a superior listening experience, particularly in home theater setups. Known for its exceptional clarity, dynamic range, and immersive soundstage, this speaker exemplifies high-end audio engineering.

One of the key features of the MartinLogan Center Channel speaker is its use of electrostatic technology. This innovative design employs a thin, lightweight diaphragm suspended between two conductive panels. This allows for superior transient response and reduced distortion, delivering audio that is both clear and detailed. The electrostatic driver provides a unique sound reproduction that immerses the listener in a rich auditory experience, making dialogues crisp and precise.

In addition to its electrostatic driver, the MartinLogan Center Channel speaker typically includes advanced woofers that complement the high-frequency performance. These woofers are engineered to handle lower frequencies effectively, ensuring a balanced sound profile. The integration of these technologies results in a seamless blend of highs and lows, allowing for a full-spectrum audio experience.

The speaker also features a precision-engineered cabinet designed to minimize resonance and reduce colorations. This construction ensures that the sound produced is true to the original recording, preserving the nuances of music and film soundtracks. The cabinet is usually finished to high standards, making it a visually appealing addition to any home theater setup.

Another important characteristic of the MartinLogan Center Channel speaker is its adjustable crossover settings. This allows users to tailor the speaker's performance to fit their specific room acoustics and personal preferences. By fine-tuning the crossover frequency, enthusiasts can achieve an optimal balance across their entire audio system.

Moreover, the speaker is designed with versatility in mind. Its sleek and aesthetically pleasing design allows it to blend seamlessly with modern home decor, while its robust build quality ensures longevity. Whether used in a dedicated home theater, a living room, or a music listening space, the MartinLogan Center Channel speaker delivers an exceptional audio experience that truly elevates the enjoyment of film and music. With its commitment to innovation, craftsmanship, and performance, the MartinLogan Center Channel speaker stands as a premier choice for serious audiophiles and home theater enthusiasts alike.