the technical background

collaboration generates consummate sound

The different components collaborate to reproduce the sound in SA explorer. Each component has been specially designed to do its part of the job: The actual bass notes are reproduced by four specially designed woofers in which the membranes are affected by no fewer than eight built-in moving coils, which guarantee fast and controlled deep bass. The higher bass notes are reproduced by the same four membranes – but are only driven by one of each woofer’s two moving coils. The two upper woofers generate the midrange and the specially designed tweeter reproduces the highest tones in the audible register.

The deepest notes are transmitted through two bass reflex tubes on the back of the cabinet – a simple and inventive solution which exploits the fact that the deep notes spread like rings in water and are, therefore, heard equally clearly all the way around the speaker – including straight in front of it. Because the two tubes are on the rear of the cabinet, their mechanical impact on the cabinet is compensated for by a corresponding impact from the bass elements on the front of the speakers, thus solving the traditional and complicated question of vibrations in the cabinet caused by the force of the movable parts.

speed – the ability to inform

Sound is the most important aspect of a loudspeaker. But a speaker works against the laws of nature in a way that no other part of the sound system does. In an amplifier, a DVD, or a CD player, the sound signal consists of electrons, which are processed and moved quickly and precisely between the components with almost no loss of important information. Sound is created in the loudspeaker by membranes that move physically and weigh far more than electrons. This makes the speakers the slowest piece of equipment in the sound system, so if you want to improve the sound you have to improve the speed of the speaker. Each of the four membranes in the specially designed woofers for SA explorer weighs only 0.9 gram – less than a quarter of an ordinary piece of A4 paper! – and the membrane on explorer’s special tweeter weighs just 80 mg, which is 35% less than an ordinary tweeter membrane. These uniquely light membranes mean that SA explorer reacts incredibly quickly, revealing myriads of important details in the sound.

Instead of following technological trends, which could change overnight, System Audio A/S develops speakers with the aid of the most important ”measuring instrument” of all: the human ear. During the long development process that led to the SA explorer, we conducted meticulous listening tests and experimented with countless different materials for our speaker membranes. As a result of all those tests, our membranes are made of processed natural materials because of the superior sound characteristics inherent in those materials.

20 individual blocks of damping material

Inside the SA explorer cabinet we have placed 20 small blocks of damping material to create the perfect acoustics. Each one has its own job inside the speaker, and together they optimize the air current, prevent standing waves and stop sound from the inside of the cabinet making their way out through its membranes.

mechanical decoupling prevents

floor vibrations

SA explorer is one of the only speakers in the world with a cabinet that is mechanically decoupled from the floor. We have conducted in-depth studies and optimised the base plate of the speaker. Mechanical stability is crucial and by preventing vibrations spreading to the floor avoids the loss of vital sound information.

the cabinet – the speaker’s foundation

Better sound quality starts with a better speaker cabinet. A stronger cabinet with fewer vibrations and correct acoustic dimensions provides the speaker elements with better working conditions, which makes the sound more natural.

• The SA explorer cabinet is made of MDF with a thickness varying from 18 to 58 mm
• the design consists internal bracing which optimize the acoustics inside the speaker and help air circulate inside the cabinet, so no compression or turbulence arises
• on the front of the speaker, behind the removable plate with the SA logo, there is access to a separate sand chamber in the bottom of the cabinet. By filling the chamber with dry sand, you can achieve greater sound precision
• the front grille which protects the drive units is rounded on the inside to avoid sound reflections
• SA explorer is delivered with spikes and rubber feet for mounting under the base plate

woofer SA W1404XL

the woofers introduce XL technology

Each W1404XL woofer contains a new technology with two voice coils in the magnet instead of one. We call it XL technology because the sound becomes ”extra large” and because it excels. These small woofers are incredibly durable and precise because the various movable parts are cast together in the same mould and not glued together like traditional woofers.

• XL technology uses two voice coils in each woofer to reproduce the deepest notes
• XL technology makes our woofers capable of reproducing far deeper bass than woofers with traditional technology
• membrane weight: 0.9 gram, corresponding to 25 % of the weight of an ordinary piece of A4 paper
• 12 mm stroke (membrane movement)
• cast aluminium chassis
• the W1404XL bass element is magnetically shielded
• XL technology is only available in SA speakers

tweeter SA T2506XS

the T2506XS tweeter is an acoustic masterpiece

Acoustics, precision engineering and musicality converge in the T2506XS tweeter to provide a fantastically subtle reproduction of every detail of the sound. With a weight of just 80 mg, the almost transparent membrane is possibly the lightest ever made.

• XS technology means that a wave guide around the membrane controls the sound dispersion so it is not reflected from the front plate and edges of the cabinet. The wave guide is an advanced acoustic solution which directs sound waves away from obstacles and establishes a simplification of the electronic circuitry that benefits the sound quality
• XS Technology also ensures that the tweeter transmits sound over a greater area than most traditional tweeters. You can move around, or sit in different places, and still experience uniform sound quality throughout the room. Ordinary tweeters distribute the highest tones as a narrow beam, so you have to sit right in front of the speaker to get the full benefit of the experience. XS technology extends the area in front of the speakers where you can enjoy the best possible sound quality
• a 12 mm front plate made of cast aluminium serves as the vibration-free base from which the treble unit transmits information that requires precise membrane movements all the way down to 0.0005 mm!!
• unique textile membrane weighing only 80 mg – possibly the lightest ever made
• built-in separate chamber behind the membrane
• resonance caused by the sound from the rear of the membrane striking the bottom plate of the magnet is eliminated by three different small blocks of damping material, which can be seen through the almost transparent membrane
• the T2506XS treble speaker is magnetically shielded
• XS technology is only found in SA speakers

the crossover network

less can be more

In SA explorer every effort has been made to optimise the interaction between the speaker elements and the acoustics, so there is only need for a minimal crossover network to divide the work between the speaker elements. Complicated solutions may be fascinating from a technological perspective, but in a speaker complexity means that the sound has to pass through more components, each of which removes signals and creates distance between you and the living sound.

• the SA explorer crossover network contains only five (!) components through which the sound signal must pass
• Nordost cables are used for internal wiring

technical specifications