Omnidirectional speaker, model Eternity by RAAL-requisite

Alex, finally I could meet you at the CES 09 in Las Vegas, where I heard your own speaker project on classical music - it was utterly natural sounding. You seem to have a very clear idea in mind how natural music sounds. That is rarely experienced in the pro-market...
Having used your tweeters in my own designs for about a year now I can totally confirm that your tweeters were able to take the overall performance to a new level. So far, I have been skeptical about ribbon tweeters, since all I heard sounded somewhat thin, colorless and with an aluminum-rustling noise to them. Now, I am sure, your tweeters are the most disappearing ones on the market - that means that they seemingly neither add, nor substract much from the incoming signal. Plus, their extended hi-freq. response adds a great deal of spaciousness, image depth and realism to the performance.
The fast growing demand of your products worldwide is for once a true indicator of how good they are. My most upright congratulations.

Sven Boenicke
Speaker designer & recording engineer
Boenicke Audio
Basel, Switzerland

Aleksandar, thanks for giving us such fine products to work with. Audiophile speakers are like a great meal - you have to start with excellent ingredients in order to make a fine presentation. The RAAL ribbons have allowed us to kick it up a notch!

Rick Craig
Owner
Selah Audio
Garner, NC, USA

Dear Alex, after analyzing many higher frequency drivers for our loudspeaker production, we came to the conclusion that the RAAL ribbons are of the highest quality one can find. Our advanced Comsol multiphysics software is used for modelling the loudspeakers. The test of your various models reveals that –if filtered correctly- the results in sound quality are astonishingly good. Very high sound levels can be reached with moderate distortion. The speed and dampening are exemplary. Tolerances are good and stability in practical use is excellent.
So we decided to use your products for our new production series of two of our brand-names, the Crystal loudspeaker and the Pantheon XX (by Siltech).

Edwin van der Kley
CEO
International Audio Holding BV
Siltech BV
Crystal Cable BV
Arnhem, Netherlands

Dear Alexandar, I have worked with Ribbons of all types over the last 30 years. I tried Technics, Visaton, Decca, Fountek and many others. Having tried your Ribbons i have for the first time experienced something like perfection. The sound is ultra pure and neutral. I hear details in the recording such as low level sounds from the recording studio and ambient clues like newer before. Strangely enough, this ability of your tweeters never interferes with the enjoyment of the recording. They never sound sterile or analytical. You also solved the age old problem of comb filter effects and vertical beaming with your foam pads. Manufacturing quality, looks and measurements are all to a very high standard. I can not wait to hear the version with amorphous core transformer.
You lifted my life as a music lover to the new heights.

Joachim Gerhard
CEO
Sonics GmbH
Brilon, Germany

I was floored the first time I hooked up the 70-10 Ribbon driver! The sound is so alive and open but without sounding harsh or distorted. The stereo image of my custom speaker systems is so very accurate and precise. It is very important to have a pinpoint sharp stereo image when recording and mixing music. The mono information should be dead center and stereo information should be where ever you place it in the mix. I use the ribbons in an active setup driven with the finest class-D amps available.
The RAAL RIBBON drivers make it easier for me to make great sounding records!

Tobias Lindell
Producer and Mix Engineer
Lindell Audio & Bohus Studios
Kungalv, Sweden

Alexander, your 140-15D is an amazing tweeter. It is the purest sounding tweeter I have ever heard. You just hear the music. Thank you for building such a wonderful loudspeaker. I have been building custom hi fi and P.A. speakers for over 35 years and I would have to say your tweeter is the most drastic step forward in sound reproduction improvements I have experienced. I am now redesigning my speakers to include your tweeter.

Peter Dix
Owner
PDS Pro Audio
Abbotsford, B.C., Canada

I have never experienced a tweeter with so consistent and smooth frequency response measured at 0.28, 1.2 and 2.2 meters. The next best measurement is Waterfall - the shortest decay time ever measured.
Thank you, Aleks, for completely engineered product and excellent workmanship.

Wally Malewicz
Owner
WAM Engineering
FlexSpeakers
Hamel, MN, USA

Dear Aleksander, after years of designing and installing monitors and other equipment in state-of-the-art recording studios, your 140-15D true ribbon transducers will change the way I design Speakers. I just installed a system with the 140-15's in passive 2.5 way mid field monitors using 2 x Volt BM220.08’s. All I can say is WOW! Up until now I have only been able to use TAD or Scan Speak tweeters in studio installs. These ribbons share the better qualities of the best dynamic/horn systems with out the power compression or throat resonance. These things have NO coloration and are the most transparent drivers I have ever heard, plus none of the sizzle/distortion that folded ribbons and planar-magnetics are plagued with. I must say, I can not believe the clean SPL these things put out. They easily keep up with the Volts being driven full power with a 500 watt amp! Truly amazing!

Norman Druce
Owner
Norman Druce Audio
Owosso, MI, USA

Mr. Radisavljevic, just wanted to drop you a line to thank you for making a stellar product that seriously outperforms its dollar amount. I immediately noticed the stereo image improve. This is a stock comment for decent monitors as far as width is concerned, and I have had this experience before, but your ribbons improved the DEPTH of my stereo image! No small feat. I could hear things that I struggled to place or even hear in a dense mix in the past. They also revealed some problems as far as EQ and placement in my mixes. This is not a phenomenon I am unfamiliar with happening, but usually, weeks or months after I am finished with a record, listening on a friend’s stereo with the distance and perception time and venue provides. You make a product that not only sounds great but bends the space-time continuum! All this and I can listen to them all day with less ear fatigue. Should you find yourself in Detroit in the future, I owe you a beer.

Chris Koltay
Owner
High Bias Recordings LLC
Detroit. MI, USA

Hallo Aleksandar, we would like to thank you for making those excellent ribbon tweeters which help to take loudspeaker development to a new level.
We have to confirm that your creativeness in looking for improvements in ribbon design and your exceptional attention to detail as well in design as in manufacture do not only result in excellent measurement performance but also in an amazing sound quality.

Rainer Weber & Klaus Rottenwöhrer
RWA Akustik Systeme
Akustikbau Kaiser
Untergriesbach, Germany

Being a long time user of RAAL ribbons, I have always had considerable problems which are probably going to keep coming up in the future. It has been very difficult to find an adequate partner for them, be it mid-bass or mid units. More or less, only custom built loudspeakers can match these extremely demanding ribbons. With every new project, I face the same time consuming struggle. It often happens that, while listening to other systems without RAAL ribbons, I have to ask: “Excuse me, but are your tweeters working properly??These ribbons are not capable of hiding or diminishing anything at all. You are able to hear the details from the recording that recording engineers certainly don’t want you to hear. Way to go, Alex! Keep revealing the truth to us in the future!

Nenad Napijalo
Founder, President
N.N. Acoustics Engineering
Belgrade, Serbia

Dear Mr. Radisavljevic, I would like to thank you for your outstanding service and exceptional ribbon drivers. After six years, developing our line of Studio Monitors, it is your expertise that allowed us to finally achieve our goals. Thank you for working so hard and for making such a difference. I look forward to many future projects.

Danny McKinney
President
Requisite Audio Engineering,
The Standel Amplifier Co.
Los Angeles, CA, USA

We have chosen to include the RAAL ribbon tweeters in our products , due to their excellent performances . Alexander Radisavljevic is the new "wonder boy" among ribbon tweeter designers and is to be compared to the other biggest "stars" like Dick Sequerra and Alain Benard , no if's , no but's.

Guglielmo Burger
Finaudio / Aliante /
PataAcustica / CC... /
Caterham Acoustics
Revello, Italia

Having had the opportunity to test many ribbons over the years I find the line RAAL ribbons to be the best by far. The high level of engineering that has gone into these units is immediately heard. The detail and accuracy is truly amazing.

Todd Michael
Head Speaker Designer
Yorkville Sound
Toronto, Canada

Hello Aleksandar, I have gone through about $13000.00 worth of tweeters of all types in my quest over the last 3-1/2 years. I have never liked any ribbon that I have tried before. I have found them to be dynamically constrained despite what the magazine and the do-it-yourselfers post. I have also found them to be overly bright and body-less.
Well I can say that I am going to be using your 140-15D ribbon in my reference speaker design, your creation is simply fantastic and probably the best tweeter I have yet to hear. One of the major things I hated about ribbons was their delicacy, your ribbon does away with that issue. Congratulations on doing what seemingly no other manufacturer of ribbon tweeters has been able to do.

Donald Nance Jr.
Tangent Audio LLC
Atlanta, GA, USA

Dear Aleksandar, thank you for the excellent quality tweeter, thank you for the years and years of experience needed to produce such really great quality.

Majid Jafari
R&D Manager
JTS Pro Audio Group
Tehran, Iran