MartinLogan Prodigy Spécifications télécharger pdf (Page 18)

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PanelCritical Zone: 250Hz–20kHz

The most significant advantage of MartinLogan’s exclusive

transducer technology reveals itself when you look at

examples of other loudspeaker products on the market today.

The Prodigy uses no crossover networks above 250 Hz

because they are not needed. The Prodigy consists of a single,

seamless electrostatic membrane reproducing all frequencies

above 250 Hz simultaneously. How is this possible?

First we must understand that music is not composed of

separate high, mid and low frequency pieces. In fact,

music is comprised of a single complex waveform with all

frequencies interacting simultaneously.

The electrostatic transducer of the Prodigy essentially acts

as an exact opposite of the microphones used to record

the original event. A microphone, which is a single working

element, transforms acoustic energy into an electrical signal

that can be amplified or preserved by some type of storage

media. The Prodigy’s electrostatic transducer transforms

electrical energy from your amplifier into acoustical energy.

Due to the limitations of electromagnetic drivers, no

single unit can reproduce the full range of frequencies.

Instead, these drivers must be designed to operate within

narrow, fixed bandwidth of the frequency range, and then

combined electrically so that the sum of the parts equals

the total signal. While nice in theory, we must deal with

real-world conditions.

In order to use multiple drivers, a crossover network is

enlisted to attempt a division of the complex musical signal

into the separate pieces (usually highs, mids, and lows) that

each specific driver was designed to handle. Unfortunately,

due to the phase relationships that occur within all crossover

networks and during the acoustical recombination process,

nonlinearities and severe degradation of the music signal

take place in the ear’s most critical zone (See Figure 16).

The Prodigy’s electrostatic transducer can single-handedly

reproduce all frequencies above 250 Hz simultaneously.

You have in one transducer the ability to handle in elegant

simplicity the critical frequencies above 250 Hz.

The crossover phase aberrations that are associated with

traditional tweeter, midrange, and woofer systems are

eliminated. The result is a dramatic improvement in imaging

and staging performance, due to the minutely accurate

phase relationship of the full-range panel wave launch.

Tweeter

Midrange

Woofer

Conventional Loudspeaker MartinLogan Prodigy

Figure 16. This diagram illustrates how a conventional

speaker system must use multiple crossover networks

that have negative effects on the musical performance.

Full Range Operation

crossover point (2–5kHz)

crossover point (250Hz)

crossover point (100–400Hz)

Woofer

18 Electrostatic Advantages

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MartinLogan Prodigy Spécifications Page 18

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