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Berlina RC 9

Hear to tempt you

I remember many years ago when I held a talk in a German university covering the subject of new materials in loudspeaker design. I reported on measurements and listening sessions where we realized that hard diaphragm materials are in benefit over soft ones because music consists of single impulses and not of steady sine waves. In the discussion a professor asked me what material would be best and I answered: “Diamond of course. It has the highest hardness, stiffness, velocity of sound, heat dissipation and a very low mass. But thinking of a loud-speaker diaphragm built up of diamond is crazy!” and all people laughed. Now 20 years later the dream has become reality! Diamond drivers are available now. And not only as tweeter but also as midrange driver. This development pushed us to build the “Best loudspeaker in The World”, the GAUDER AKUSTIK BERLINA RC11 

From Idea to Product

In the beginning there was the question: if nature would build a loudspeaker how would it look like? Then we started to think about it. Like a human being, we thought. A sternum built up of single ribs which enclose a volume for resonating. And of course a spine for stability. And so we came up with the rib construction, dampers between the single ribs and a hard front covered with heavy stone for stability, everything enclosing a volume for low resonance.

It is always like that with new inventions leading to new ways in technology. But there is always the need for an impetus, too. An impetus that drives you forward to ask such questions and find such solutions. This impetus is music. Music and its reproduction is something that you are addicted to when you love it. The love of music is so essential, music is the only language which is understood in every country without speaking. It is universal! It is over -whelming and connecting people.

Therefore we build these fantastic loudspeakers!

Dr. Roland Gauder

Chief-Designer and Managing Director

Dynamical Sound and Design

Many people still compare a loudspeaker with a musical instrument. This is completely wrong. A loudspeker’s task is to reproduce any instrument and any voice in the most natural way possible. We want to hear how a Stradivari sounds, what the difference is between a Bösendorfer and a Steinway piano and who is the singer in the band or on the opera stage. Therefore all intrinsic influences by the speaker must be totally suppressed. It is easy to realize now that the vibrating cabinet always has a big influence on the reproduced sound. Therefore we have invented our famous rib construction (RC) concept: the cabinet consist of single wooden ribs which are separated by highly damping ribs. Each rib is thick, heavy and very stiff – bad conditions for vibrations. By stacking these ribs a volume is enclosed and so the loudspeaker cabinet is created.

This technology has already proved its advantage over conventional cabinets by the performance of our BERLINARC 7 whose clear, transparent and natural sound has impressed many people world-wide. The BERLINARC 9 is based on the same concept but some what higher to have enough volume for an even lower and cotrolled bass.

The BERLINARC 11 is even more extensive: the cabinet consists of three separated enclosures, two for the two bass-units and the mid-high-section which is placed in ear-height between the two woofer-units. Thus no bass vibrations can affect the mid-highsection in any way. The stones at the bottom of the RC 9 and RC 11 manifest a solid stand and decouple the speakers from the floor.

From Theory to Music – Requirements for Loudspeaker Building

Building loudspeakers is the right task for physicist and not for musicians. Musicians can judge their own instrument but are not able to know about the complex working and function of a technical device like a loudspeaker. No one can guess the volume, the single drivers or the frequency crossovers just by imagination. There is a strong need for mathematics and acoustical physics if it should work accurately. But if science and musical talent come together the requirements for a masterpiece are given!

Gone are the days where people thought crossovers with 6 dB slope per octave would be the best. Nowadays there is consense thatthis is not the case, more sophisticated crossovers work better. Our loudspeakers from Gauder Akustik have proven this since many, many years. And the new generation of symmetry in crossover design is even one step beyond. So when we started to work out the concept of the BERLINARC 9 and RC 11 it was clear that our fundamental loudspeaker theory had to be applied to a 4-way-loudspeaker for the first time. This led to a system of nonlinear equations which were unsolvable decades ago but nowadays computer networks and mainframe computers are able to solve it. And so mathematics told us how to build the perfect music machine. And we added emotions by a listening setup that took us many months of listening and judging. So mathematics and music are connected by our loudspeakers again. A natural connection!

Four Ways, One Goal

To reproduce the large audio spectrum in a perfect way it takes special drive-units for the different frequencies. While we can only see one octave with our eyes (from red to blue) we can hear ten octaves with our ears (from 16 Hz to 16.000 Hz). To reproduce such an enormous frequency range by one diaphragm is impossible. And so we have cut off the whole frequency range into four parts, giving the drive-units just two and a half octaves for reproduction. So each drive-unit is working in the frequency range which is best-suited for it, ceramic from bass to 1.000 Hz and diamond for all audible frequencies above. So the most important frequency range, the midrange and the highs, is performed by diamonds, bass and low midrange by ceramics.

Excellent sound by symmetry in frequency crossovers

In a four-way system the frequency crossover is the most crucial element of correct music reproduction. All the high-pass and lowpass filters have a big mutual influence which makes it so com -plicated to work out the correct transfer function equations. For example such a 4-way-system is about 10.000 times more complicated to calculate than a 3-way-system but with the aid of modern mainframe computers even such equations can be solved and physically realized.

A crucial point for 4-way-system also is the overlap of the single frequency branches. With normal filters such an overlap is about 3 octaves so that in the midrange 3 drivers play nearly equally loud. This leads to an enormous loss in spaciousness and localizability, two main criteria for good sound. Therefore we have in -vented our ultra high-slope technology which works with slopes of more than 60 dB/octave, a value which is so high that the acoustically overlap is less than a half octave! You see this is a new way to drive a 4-way-system with im-mediately clear advantages.

As 4-way-system normally has some critical aspects for the amplifier we invented a new mode of filter design, called “symmetrical crossover design”.

Lossless connection through the best binding-posts in the world

The musical performance of a speaker is strongly limited by the acoustical properties of the listening room. Therefore we have provided the BERLINARC 11 and RC 9 with a room-equalization device which can simply be adjusted by plugging a jumper into one of the different positions. Thus you can setup the speakers to your listening room and your taste of listening to music. As this device is on the back of the BERLINAs it is easily accessible and can be changed during playing.

It is also possible to get a custom-made setup of your BERLINA by sending us information about your listening room, your listening position and the placement of the speakers. We can then make a setup especially for this room. This service certainly is free as we are really interested that our speakers work accurately in your home.

The Binding posts. There is just only one word we can tell you: WBT! We only use WBT-binding posts and connectors to have the best what you can get on the world-market. No loss of detail or connection problems, best sound guaranteed, what shall we say more about it?

Ceramics and Diamonds

Ceramics is a fantastic material. There are many applications now appearing on the market even though it is not easy to produce and handle it. Also for loudspeaker diaphragms it is nearly unrivalled. Light, hard, stiff – as a perfect material should be. Therefore we count on it as diaphragms of our drive-units within the BERLINAseries. At least up to 1000 Hz. But then beyond there is something even better: diamond. Diamond is a material like from another universe. It is the material with the highest hardness and stiffness. It works like a piston up to frequencies far beyond the human hearing. This diaphragm withstands even highest accelerations, the resolution of finest details and impulses is done with ease. Dynamical compression by deshaping of the diaphragm or intrinsic diaphragm modes are non-existent. Impulses stay impulses. The speed of sound in diamond is 18.000 m/s thus three times as high as in Titanium! So diaphragm resonances occur only at 80.000 Hz, far beyond the human hearing threshold.

Moreover, diamond works like a huge heat sink. Its heat conduc -tivity is five times higher than that of silver, the second best material. The formerly observed upheating of the voice-coil accompanied by loss of dynamics cannot occur.

Thus it is not a wonder that ceramics and diamond revolutionize loudspeaker building. Like our high-slope filters and symmetrical frequency crossovers do. And so the BERLINAs are real childrenof the revolution.

Precision and speed – new qualities in low-bass reproduction

After all these blown up basses that we used to hear in the last decade in so many movies we long for a natural bass response of loudspeakers when we listen to normal music. It must go down deep but most of all it must be precise and fast, no ringing, no booming is expected.

Especially for loudspeakers like the BERLINA RC 9 and RC 11. If the bass is so blown up that it covers and colorates the midrange music gets boring and annoying. Therefore we have created the woofer section of the BERLINA RC 11 with four 9”-woofers instead of 15”-woofers which cannot follow the speed of the midrange drivers.

The BERLINA RC 9 features three specially designed long-throw 7”-woofers which are faster than many midrange drivers. So the BERLINAs work like made all of a piece. To suppress resonance modes at very low frequencies the RC 11 has the second bass unit aligned on the top. The RC 11 thus creates a very even excitation of the room.

Finish and overall quality

All our speakers are handmade by ourselves in our com -pany in Renningen close to Stuttgart in Germany. All components used are “Made in Germany”, we only rely on the best and our German workmanship gives you the guarantee of having best finish and overall quality you can get. All our workers have a special education and addiction to wood working and painting. I promise you, you will be impressed by the work you get. This is not just a loud -speaker this is a piece of art!

We promise you a unique music experience with our BERLINA loudspeakers. Just sit down and listen!